International Journal of Plasticity最新文献

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Unveiling creep mechanisms in metallic glasses via fractional modeling under coupled thermo-mechanical loads 热-机械耦合载荷下金属玻璃蠕变机理的分式建模
IF 12.8 1区 材料科学
International Journal of Plasticity Pub Date : 2025-12-01 Epub Date: 2025-10-17 DOI: 10.1016/j.ijplas.2025.104511
J.B. Cui , G.H. Xing , Guo-Jian Lyu , Yun-Jiang Wang , T. Wada , H. Kato , V.A. Khonik , Y. Yang , J.C. Qiao
{"title":"Unveiling creep mechanisms in metallic glasses via fractional modeling under coupled thermo-mechanical loads","authors":"J.B. Cui ,&nbsp;G.H. Xing ,&nbsp;Guo-Jian Lyu ,&nbsp;Yun-Jiang Wang ,&nbsp;T. Wada ,&nbsp;H. Kato ,&nbsp;V.A. Khonik ,&nbsp;Y. Yang ,&nbsp;J.C. Qiao","doi":"10.1016/j.ijplas.2025.104511","DOIUrl":"10.1016/j.ijplas.2025.104511","url":null,"abstract":"<div><div>This study systematically investigates the creep behavior of Pd<sub>20</sub>Pt<sub>20</sub>Cu<sub>20</sub>Ni<sub>20</sub>P<sub>20</sub> metallic glass under varying temperatures and applied stresses. To accurately capture its time-dependent deformation response, a fractional Burgers model is proposed by extending the classical Burgers framework using fractional calculus. The model demonstrates excellent agreement with experimental data and offers physically interpretable parameters that describe the inelastic response of material. With increasing temperature, the quasi-steady-state creep strain rate increases significantly, accompanied by a notable reduction in the apparent viscosity. The viscosity-related parameters exhibit thermally activated behavior, while the fractional orders α<sub>₁</sub> and α<sub>₂</sub> also increase with temperature, indicating enhanced atomic mobility. The validity of the model is further supported by dynamic mechanical analysis, in which the temperature-dependent trends of storage and loss moduli align closely with model predictions. In contrast, increasing the stress primarily accelerates the creep rate but exerts only a limited influence on viscosity and the evolution of fractional parameters, suggesting that temperature plays a more dominant role than stress in determining creep kinetics. Creep experiments conducted on samples with different degrees of physical aging reveal that structural relaxation primarily suppresses the initial transient anelastic strain, while the quasi-steady-state stage remains largely unaffected. Finally, a comparative analysis among metallic glasses with different β relaxation features shows that alloys exhibiting more pronounced β relaxation tend to possess higher α<sub>₁</sub> and α<sub>₂</sub> values, underscoring the critical role of β relaxation in mediating intrinsic ductility and deformation behavior below the glass transition temperature in metallic glasses.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"195 ","pages":"Article 104511"},"PeriodicalIF":12.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145305783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Unraveling deformation mechanisms in CP-Ti via crystal plasticity: Direction-dependent surface roughness evolution CP-Ti的晶体塑性分解变形机制:方向依赖的表面粗糙度演化
IF 12.8 1区 材料科学
International Journal of Plasticity Pub Date : 2025-12-01 Epub Date: 2025-10-11 DOI: 10.1016/j.ijplas.2025.104503
Kyung Mun Min , Jung Yun Won , Xiaohua Hu , Hyuk Jong Bong
{"title":"Unraveling deformation mechanisms in CP-Ti via crystal plasticity: Direction-dependent surface roughness evolution","authors":"Kyung Mun Min ,&nbsp;Jung Yun Won ,&nbsp;Xiaohua Hu ,&nbsp;Hyuk Jong Bong","doi":"10.1016/j.ijplas.2025.104503","DOIUrl":"10.1016/j.ijplas.2025.104503","url":null,"abstract":"<div><div>This study investigates the evolution of surface roughness and the underlying deformation mechanisms in ultra-thin commercially pure titanium (CP-Ti) sheets, which are attracting increasing attention as candidate materials for metallic bipolar plates in fuel cells. Under uniaxial tension along the rolling direction (RD), the sheets developed markedly rough surfaces with pronounced creases aligned with the loading direction. In contrast, loading along the transverse direction (TD) produced lower roughness and a more uniform, nearly isotropic surface morphology. Crystal plasticity finite element modeling reproduced these observations and attributed the direction-dependent roughness evolution to differences in the activation of slip and twinning systems. Tensile loading along RD was dominated by prismatic ⟨a⟩ slip, restricting through-thickness deformation. Conversely, tensile loading along TD activated multiple deformation systems, enabling more distributed deformation in multiple directions. These mechanisms were further supported by deformation microstructures revealed through electron backscatter diffraction. Taken together, these findings clarify the origin of direction-dependent roughening and provide mechanistic insight into heterogeneous through-thickness deformation behavior and its role in surface roughness evolution.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"195 ","pages":"Article 104503"},"PeriodicalIF":12.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A coupled crystal plasticity-phase field framework for anisotropic fracture in Ni-based single crystals 镍基单晶各向异性断裂的晶体塑性-相场耦合框架
IF 12.8 1区 材料科学
International Journal of Plasticity Pub Date : 2025-12-01 Epub Date: 2025-11-05 DOI: 10.1016/j.ijplas.2025.104541
H.T. Li , X.M. Wang , H. Cheng , Z.L. Ding , S.Y. Sun , W.Z. Yang , Y. Wang
{"title":"A coupled crystal plasticity-phase field framework for anisotropic fracture in Ni-based single crystals","authors":"H.T. Li ,&nbsp;X.M. Wang ,&nbsp;H. Cheng ,&nbsp;Z.L. Ding ,&nbsp;S.Y. Sun ,&nbsp;W.Z. Yang ,&nbsp;Y. Wang","doi":"10.1016/j.ijplas.2025.104541","DOIUrl":"10.1016/j.ijplas.2025.104541","url":null,"abstract":"<div><div>Crack nucleation, propagation and coalescence in anisotropic Ni-based single crystal superalloys are critical to the durability of aero engines hot-section components. This study develops a coupled crystal-plasticity and phase-field model to capture the fracture behavior for the materials and account for the coupling effects between plasticity and damage. The framework incorporates a fracture toughness degradation function driven by plastic strain energy, directly illustrating the influence of plastic deformation on crack resistance. Additionally, a yield surface degradation function, incorporated into power-law flow theory, accounts for damage-induced strength reduction and prevents numerical instabilities in severely damaged zones. Furthermore, elastoplastic constitutive relations are decomposed into crack-driving and persistent components within a variational framework, addressing tension-compression asymmetry for fracture behavior and satisfying the orthogonality decomposition condition for anisotropic materials. The proposed model is validated through numerical examples, demonstrating its ability to accurately predict experimental results and elucidate the anisotropic fracture processes in Ni-based single crystal superalloys. This work provides a robust framework for understanding and predicting fracture in anisotropic materials, with potential applications for advancing aerospace hot-section component design.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"195 ","pages":"Article 104541"},"PeriodicalIF":12.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145441396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multiple-mechanism and microstructure-based crystal plasticity simulation of cyclic deformation in TRIP-assisted duplex stainless steels 基于trip辅助双相不锈钢循环变形多机制和显微组织的晶体塑性模拟
IF 12.8 1区 材料科学
International Journal of Plasticity Pub Date : 2025-12-01 Epub Date: 2025-10-22 DOI: 10.1016/j.ijplas.2025.104521
Xiaolong Li , Miao Jin , Qingling Zhang , Yinqiang Wang , Xiaocong Ma , Shiyan Zhao , Lei Chen , Xingzhou Cai
{"title":"Multiple-mechanism and microstructure-based crystal plasticity simulation of cyclic deformation in TRIP-assisted duplex stainless steels","authors":"Xiaolong Li ,&nbsp;Miao Jin ,&nbsp;Qingling Zhang ,&nbsp;Yinqiang Wang ,&nbsp;Xiaocong Ma ,&nbsp;Shiyan Zhao ,&nbsp;Lei Chen ,&nbsp;Xingzhou Cai","doi":"10.1016/j.ijplas.2025.104521","DOIUrl":"10.1016/j.ijplas.2025.104521","url":null,"abstract":"<div><div>Transformation-induced plasticity (TRIP) - assisted duplex stainless steels (DSSs) are widely used in industrial applications due to their significantly reduced density, as well as the excellent ductility and work hardening capability induced by the TRIP effect. Cyclic loading is commonly encountered in their industrial applications. Therefore, studying the cyclic plastic behavior of TRIP-assisted DSSs is of significant importance. The cyclic deformation behavior and its micro-mechanisms were investigated through mechanical experiments, EBSD, and TEM characterization. Subsequently, a physical-based crystal plasticity constitutive model, incorporating multiple mechanisms such as dislocation density evolution in the ferrite and martensitic transformation in the austenite, was developed and implemented in ABAQUS with the UMAT subroutine. A 3D-RVE was established, and the model was calibrated and validated based on the material’s cyclic mechanical response, martensitic volume fraction, and dislocation density evolution. Additionally, a 2.5D-RVE was established based on EBSD data to simulate the cyclic deformation behavior of the material. The computational results indicate that the occurrence of martensitic transformation requires the combined effect of the stress level and Schmid factor in the austenite grains, both of which are influenced by the austenite grain orientations. A high stress level in the austenite grains increases the resolved shear stress on partial fault-bands in adjacent austenite grains, thus promoting phase transformation in the grain boundary regions of the neighboring austenite grains. Due to its lower yield strength, ferrite is more prone to plastic deformation. The resolved shear stress of the activated slip systems will indirectly increase the resolved shear stress on partial fault-bands in adjacent austenite grains, further promoting phase transformation at the phase boundary regions of the austenite grains.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"195 ","pages":"Article 104521"},"PeriodicalIF":12.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145382398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Predicting dislocation patterns and discovering the law of similitude: Machine learning based on fully reversed fatigue of FCC metals 预测位错模式和发现相似定律:基于FCC金属完全反向疲劳的机器学习
IF 12.8 1区 材料科学
International Journal of Plasticity Pub Date : 2025-12-01 Epub Date: 2025-10-28 DOI: 10.1016/j.ijplas.2025.104535
Ronghai Wu , Lei Zeng , Zanpeng Shangguan , Yuxin Zhang , Zichao Peng , Xuqing Wang , Heng Li
{"title":"Predicting dislocation patterns and discovering the law of similitude: Machine learning based on fully reversed fatigue of FCC metals","authors":"Ronghai Wu ,&nbsp;Lei Zeng ,&nbsp;Zanpeng Shangguan ,&nbsp;Yuxin Zhang ,&nbsp;Zichao Peng ,&nbsp;Xuqing Wang ,&nbsp;Heng Li","doi":"10.1016/j.ijplas.2025.104535","DOIUrl":"10.1016/j.ijplas.2025.104535","url":null,"abstract":"<div><div>Dislocation patterns reflect the complex self-organization nature of dislocations and have strong influence on the mechanical properties of crystalline materials. Although the law of similitude has been widely accepted to quantify the relation between saturation resolved shear stress and pattern wavelength, it remains a big challenge to link the major inputs (e.g. saturation resolved shear stress, crystal orientation and applied strain amplitude) and major outputs (e.g. wave-type and wave-length) of dislocation patterns. In the present work, we develop two black-box machine learning methods to predict the wave-type and wave-length, as well as two white-box machine learning methods to discover explicit formulas linking major inputs and wave-length of dislocation patterns, based on the experimental data of room temperature fully reversed fatigue of FCC metals. Data of single crystal Cu are used for training and validation, and data of bicrystal Cu and polycrystal Ni are used for testing. The results show that the black-box machine learning methods can well predict over twenty types of patterns consisting of five constitutive patterns (i.e. wall, vein, ladder, labyrinth and cell structures) and their wavelengths. The traditional law of similitude, as well as an improved version that additionally incorporates crystal orientation, are surprisingly discovered from experimental data under the guidance of expert knowledge and physical constraints in the white-box machine learning methods. This improved formulation represents a significant advancement toward establishing a more comprehensive law of similitude.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"195 ","pages":"Article 104535"},"PeriodicalIF":12.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145383040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Using mechanical equilibrium to correct HR-EBSD stress measurements 利用机械平衡校正HR-EBSD应力测量值
IF 12.8 1区 材料科学
International Journal of Plasticity Pub Date : 2025-12-01 Epub Date: 2025-09-09 DOI: 10.1016/j.ijplas.2025.104464
Eralp Demir , Anna Kareer , Chris Hardie , Edmund Tarleton
{"title":"Using mechanical equilibrium to correct HR-EBSD stress measurements","authors":"Eralp Demir ,&nbsp;Anna Kareer ,&nbsp;Chris Hardie ,&nbsp;Edmund Tarleton","doi":"10.1016/j.ijplas.2025.104464","DOIUrl":"10.1016/j.ijplas.2025.104464","url":null,"abstract":"<div><div>High-resolution electron-backscatter diffraction (HR-EBSD) is widely adopted as a method to obtain local stress and strain distributions in both single-crystal and polycrystalline materials. In this study, we develop a finite element-based method that serves as a numerical correction to refine the relative stress measurements captured experimentally from HR-EBSD and to ensure that the measurements satisfy mechanical equilibrium and traction-free surface constraints. Through calculation of stress for each of the reference points, previously assumed to be zero, the method captures the grain-to-grain variation of stress in polycrystalline EBSD maps. The experimental data, including a cross section of nanoindentation in unirradiated and heavy-ion-irradiated single-crystals of iron as well as polycrystalline austenitic stainless steel are analysed. The method improves the measured stresses near slip bands, grain boundaries, and hard phases while keeping the stresses physically consistent with mechanical equilibrium and ensuring that free surfaces are traction-free. The three-dimensional analysis enables the fulfilment of traction-free surface constraints, resulting in zero out-of-plane shear stress components on the free surfaces while maintaining nonzero out-of-plane shear stress components below the surface. To demonstrate the validity of this approach, the method is also applied to relative stresses, synthetically generated, for a uniform bending case; the method successfully predicts the stress distributions.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"195 ","pages":"Article 104464"},"PeriodicalIF":12.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nonequilibrium thermodynamics, kinetics, and self-organization of dislocation avalanche plasticity 位错雪崩塑性的非平衡热力学、动力学和自组织
IF 12.8 1区 材料科学
International Journal of Plasticity Pub Date : 2025-12-01 Epub Date: 2025-10-12 DOI: 10.1016/j.ijplas.2025.104504
David L. McDowell
{"title":"Nonequilibrium thermodynamics, kinetics, and self-organization of dislocation avalanche plasticity","authors":"David L. McDowell","doi":"10.1016/j.ijplas.2025.104504","DOIUrl":"10.1016/j.ijplas.2025.104504","url":null,"abstract":"<div><div>Representative experimental findings are reviewed regarding the distribution of avalanche sizes in crystals. Insight gained from mean field theory regarding universal scaling relations in the depinning transition and the influence of the dislocation jamming transition on extended criticality are addressed within a framework for nonequilibrium thermodynamics for a sequence of constrained local equilibrium states introduced by McDowell (2024a,b,c) and McDowell and Liu (2025). The concept of the degree-of-correlation of dislocation-barrier reactions plays a central role. Early-stage decorrelated dislocation multiplication processes along with cross-slip and other weak barrier reactions are argued to diminish in the jamming transition as internal stress fields develop in an extended critical state towards the depinning transition. Under depinning dominance universal scaling is realized. The progression towards increasingly correlated reactions is argued to maximize the entropy change of pending reactions at each step along the nonequilibrium trajectory as a proxy assertion for maximal intrinsic entropy production associated with state transitions. In the depinning transition, dislocation avalanches of all sizes up to the maximum avalanche size established by the dissipation-weighted effective enthalpy barrier contribute to slip system shearing. Size effects and “wild to mild” transitions from submicron specimen responses up to polycrystals are interpreted in terms of scale-appropriate dislocation precursor reactions and averaging of distributed avalanching processes. Dominant effects of free surface interactions and dislocation source limitations are exerted for specimens with size below 1 μm, with jerky avalanching owing to statistical inhomogeneity and elevated stress. Increasing specimen size leads to progressive smoothing of overall stress-strain response.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"195 ","pages":"Article 104504"},"PeriodicalIF":12.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145282824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Excellent mechanical properties and superelasticity: bimodal heterostructure enhances NiTi alloy fabricated via laser powder bed fusion 优异的力学性能和超弹性:双峰异质结构增强了激光粉末床熔合制备的NiTi合金
IF 12.8 1区 材料科学
International Journal of Plasticity Pub Date : 2025-12-01 Epub Date: 2025-11-05 DOI: 10.1016/j.ijplas.2025.104544
Minqian Liu , Danyang Lin , Yankun Zhang , Dong Wang , Bo Xiao , Lianyong Xu , Yongdian Han , Fumiyoshi Minami
{"title":"Excellent mechanical properties and superelasticity: bimodal heterostructure enhances NiTi alloy fabricated via laser powder bed fusion","authors":"Minqian Liu ,&nbsp;Danyang Lin ,&nbsp;Yankun Zhang ,&nbsp;Dong Wang ,&nbsp;Bo Xiao ,&nbsp;Lianyong Xu ,&nbsp;Yongdian Han ,&nbsp;Fumiyoshi Minami","doi":"10.1016/j.ijplas.2025.104544","DOIUrl":"10.1016/j.ijplas.2025.104544","url":null,"abstract":"<div><div>Heterostructure (HS) materials are selected in natural evolution to exhibit superior mechanical and functional properties that traditional homogeneous materials cannot achieve. However, it is an open issue how to prepare HS alloys without destroying the advantages of laser powder bed fusion (LPBF) to directly form complex components. Here, based on the high stored energy of LPBF components, we obtained bimodal HS LPBF-NiTi shape memory alloys (SMAs) by recrystallization and abnormal grain growth induced by simple heat treatment after LPBF for the first time. The grain size of LPBF-NiTi SMAs can be regulated by modulating the heat treatment temperature. Homogeneous equiaxed fine grains (FGs), homogeneous coarse grains (CGs), and bimodal HS can be obtained after heat treatment at 780℃, 880℃, and 980℃, respectively. It is shown that LPBF-NiTi alloys with bimodal HS exhibit extraordinary strength-ductility (σ<sub>MTS</sub>-δ balance: 13,810 MPa•%) and superelasticity (SE) (σ<sub>C</sub>-δ<sub>C</sub> balance: 2232 MPa•% and 96 % of SE recovery rate in 4 % applied strain). The intrinsic mechanism leading to property enhancement was studied through in-situ experiments and simulations. It is due to the strain optimization induced by heterogeneous regions, which promotes phase transformation and alleviates plastic deformation, avoiding strain localization. This work provides theoretical and practical significance for the property improvement and application promotion of the LPBF-NiTi alloy and may open a novel avenue for fabricating other LPBF alloys with HS.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"195 ","pages":"Article 104544"},"PeriodicalIF":12.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145447566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Anomalous dynamic recrystallization during hot deformation in refractory high entropy superalloy: the role of grain boundary chemistry 难熔高熵高温合金热变形过程中的异常动态再结晶:晶界化学的作用
IF 12.8 1区 材料科学
International Journal of Plasticity Pub Date : 2025-12-01 Epub Date: 2025-10-30 DOI: 10.1016/j.ijplas.2025.104536
Yu Zhang , Hongyi Li , Junxiao Xu , Yiren Wang , Wei Wu , Fuhua Cao , Zheng Peng , Yan Chen , Lanhong Dai
{"title":"Anomalous dynamic recrystallization during hot deformation in refractory high entropy superalloy: the role of grain boundary chemistry","authors":"Yu Zhang ,&nbsp;Hongyi Li ,&nbsp;Junxiao Xu ,&nbsp;Yiren Wang ,&nbsp;Wei Wu ,&nbsp;Fuhua Cao ,&nbsp;Zheng Peng ,&nbsp;Yan Chen ,&nbsp;Lanhong Dai","doi":"10.1016/j.ijplas.2025.104536","DOIUrl":"10.1016/j.ijplas.2025.104536","url":null,"abstract":"<div><div>The limited understanding of thermomechanical deformation mechanisms in refractory high-entropy superalloys (RSAs) hinders the advancement of thermomechanical processing strategies for microstructure-property optimization. This study investigates hot-deformation and recrystallization behaviors of an Al<sub>0.5</sub>NbTa<sub>0.8</sub>Ti<sub>1.5</sub>V<sub>0.2</sub>Zr RSA, in which hot-deformation resulted in the formation of a characteristic necklace dynamic recrystallization (DRX) structure. The recrystallization fraction and grain size increase with rising temperature and decreasing strain rate, reaching maximum values of 19% recrystallized fraction and 16 μm grain size. Both discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) mechanisms operate, in which DDRX dominates initial recrystallization, while recrystallized grains exhibit hybrid DDRX-CDRX mechanisms. The redistribution of Al and Zr promotes key recrystallization processes involving GB bulging and substructure development, revealing a diffusion assisted recrystallization mechanism. These findings provide the first direct evidence of the pivotal role of Al-Zr GB phase dissolve and diffusion on the recrystallization behavior. The present study featuring diffusion assisted recrystallization mechanism in Al<sub>0.5</sub>NbTa<sub>0.8</sub>Ti<sub>1.5</sub>V<sub>0.2</sub>Zr RSA provided insights into the thermal deformation mechanism of analogous RSA and other BCC<img>HEAs.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"195 ","pages":"Article 104536"},"PeriodicalIF":12.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145396700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Critical role of L21 and L12 phase in deformation behaviors of additively manufactured FeCrNiAlTi alloy L21和L12相在增材制造的FeCrNiAlTi合金变形行为中的关键作用
IF 12.8 1区 材料科学
International Journal of Plasticity Pub Date : 2025-12-01 Epub Date: 2025-10-10 DOI: 10.1016/j.ijplas.2025.104502
Xiaopei Wang , Yan Wang , Wu Gong , Wenhua Wu , Youyou Zhang , Stefanus Harjo , Zhigang Yang , Hao Chen
{"title":"Critical role of L21 and L12 phase in deformation behaviors of additively manufactured FeCrNiAlTi alloy","authors":"Xiaopei Wang ,&nbsp;Yan Wang ,&nbsp;Wu Gong ,&nbsp;Wenhua Wu ,&nbsp;Youyou Zhang ,&nbsp;Stefanus Harjo ,&nbsp;Zhigang Yang ,&nbsp;Hao Chen","doi":"10.1016/j.ijplas.2025.104502","DOIUrl":"10.1016/j.ijplas.2025.104502","url":null,"abstract":"<div><div>Precipitation hardening is a widely used strategy to enhance the strength of face-centered cubic (FCC) alloys, but it often comes at the expense of ductility. However, the precipitates may also influence the deformation behaviors of the FCC matrix, such as strain induced stacking faults and twins, which could potentially mitigate or eliminate the loss in ductility caused by the increase in strength. In this work, we fabricated an FeCrNiAlTi FCC alloy via laser additive manufacturing, in which high density incoherent L2<sub>1</sub> phase and coherent L1<sub>2</sub> phase were introduced at cell walls and within cells respectively. An excellent balance between strength and ductility was achieved at both ambient and cryogenic temperatures by controlling the precipitation of intermetallic phases. It was found that the high density precipitates not only provide substantial strengthening but also promote deformation-induced stacking faults (SFs) and twinning, thereby enhancing work hardening through the creation of strain heterogeneity. In-situ neutron diffraction results reveal that the lattice strain after the yielding of the alloy is the predominant factors governing the formation of SFs and twins. Numerical simulation results exhibit that the large interfacial misfit of the incoherent L2<sub>1</sub> phase with the FCC matrix significantly enhances the local strain. Additionally, the combination of larger size and greater spacing of the L1<sub>2</sub> phase increases the local strain. Both L2<sub>1</sub> phase and L1<sub>2</sub> phase contribute to the enlarged local strain heterogeneity, thereby enhancing the stacking fault probability and promoting the formation of nano SFs and twins. This study presents the critical role of precipitates in tailoring deformation behaviors, thereby providing a new insight for designing strong yet ductile FCC alloys via engineering high density precipitates.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"195 ","pages":"Article 104502"},"PeriodicalIF":12.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145255204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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