International Journal of Plasticity最新文献

{"title":"Breaking the strength-ductility trade-off in metastable β21s alloy via high silicon content and heterogeneous lamellar architecture","authors":"Hao Ding ,&nbsp;Xiping Cui ,&nbsp;Xiuwen Ren ,&nbsp;Jiamu Liu ,&nbsp;Zhiqi Wang ,&nbsp;Yuanyuan Zhang ,&nbsp;Naonao Gao ,&nbsp;Yihong He ,&nbsp;Wei Ye ,&nbsp;Kanghe Jiang ,&nbsp;Mao Liu ,&nbsp;Rui Zhang ,&nbsp;Xiangxin Zhai ,&nbsp;Junfeng Chen ,&nbsp;Lin Geng ,&nbsp;Lujun Huang","doi":"10.1016/j.ijplas.2025.104369","DOIUrl":"10.1016/j.ijplas.2025.104369","url":null,"abstract":"<div><div>The metastable β21S titanium alloy faces significant challenges in practical applications due to its insufficient yield strength and restricted uniform elongation. While silicon addition has proven effective in enhancing mechanical properties of titanium alloys, conventional wisdom restricts Si content to ≤0.5 wt.% to avoid embrittlement from coarse silicide formation. This study challenges this paradigm through innovative alloy design, incorporating 0.9 wt.% Si combined with isothermal treatment and hot extrusion to create a heterogeneous lamellar structured (HLS) β21S-Si alloy. Our approach achieves dual microstructural control: isothermal pretreatment induces ∼10 nm nanowire silicide precursors that refine final precipitates to 230 nm (from 700 nm in conventional processing), while subsequent extrusion disrupts continuous grain boundary silicides and constructs a well-defined heterogeneous lamellar architecture comprising recrystallized and substructured lamellae. The optimized HLS β21S-Si exhibits remarkable mechanical performance, demonstrating a 1035 MPa yield strength (10% enhancement) and 12% uniform elongation (8 × improvement) compared to baseline β21S. Multiscale characterization combining SEM-DIC and first-principles calculations reveals a unique sequential work-hardening mechanism: heterogeneous deformation-induced (HDI) hardening dominates early stages, followed by silicon-promoted cross-slip activity, culminating in stress-induced ω phase transformation during advanced deformation. This synergistic interplay of microstructure-engineered deformation mechanisms establishes a new pathway for overcoming the persistent strength-ductility trade-off in metastable β-Ti alloys, with significant implications for aerospace applications demanding high-performance structural materials.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"190 ","pages":"Article 104369"},"PeriodicalIF":9.4,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144098965","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}

{"title":"Enhanced Strain Gradient Crystal Plasticity theory: Evolution of the length scale during deformation","authors":"Amirhossein Lame Jouybari ,&nbsp;Samir El Shawish ,&nbsp;Leon Cizelj","doi":"10.1016/j.ijplas.2025.104351","DOIUrl":"10.1016/j.ijplas.2025.104351","url":null,"abstract":"<div><div>An Enhanced Strain Gradient Crystal Plasticity (Enhanced-SGCP) theory, based on the quadratic energy contribution of the Nye tensor, is developed within a thermodynamically consistent framework to accurately capture shear band formation in terms of slip and kink bands within the microstructure. The higher-order modulus in the theory is intrinsically linked to the evolving microstructural properties during applied loading, introducing a physical length scale that governs shear band formation and evolution. It is demonstrated that the Classical-SGCP model (a Gurtin-type nonlocal theory) leads to an increasing width of localization bands, which eventually disappear, resulting in homogeneous deformation within the microstructure. This effect arises from the excessive annihilation of geometrically necessary dislocations, which suppresses localization and may lead to physically meaningless results in the formation of shear bands. To address this issue, the proposed Enhanced-SGCP theory effectively preserves the shear band width and maintains localization throughout the loading process by reducing the higher-order modulus associated with the sweeping away of hardening defects and local softening mechanism. Furthermore, the theory establishes a direct link between lattice curvature in kink bands and the Nye tensor, demonstrating that the kink bands transform into slip bands. Consequently, the Enhanced-SGCP theory breaks the equivalence between slip and kink bands, providing a more accurate physical representation of strain localization mechanisms in irradiated materials.</div><div>To computationally solve the governing balance equations, a fixed-point algorithm based on the fast Fourier Transform (FFT) method is developed. To validate the algorithm, an analytical solution for the Enhanced-SGCP theory is derived. High-resolution single-crystal simulations confirm that the kink bands transition into regularized slip bands through different physical length scales within the proposed Enhanced-SGCP framework. Furthermore, high-resolution simulations are performed on two-dimensional and three-dimensional polycrystalline aggregates, considering different length scales and various higher-order interface conditions at the grain boundaries. The results reveal that the strain gradient effects during applied loading are saturated and stabilized by the Enhanced-SGCP theory, ensuring sustained localization.</div><div>These findings highlight the capability of the proposed Enhanced-SGCP theory and the developed FFT-algorithm to provide a robust and physically consistent framework for modeling strain localization in crystalline materials. The proposed model offers significant improvements over classical approaches, particularly in preserving localization phenomena and accurately describing the interplay between slip and kink bands.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"190 ","pages":"Article 104351"},"PeriodicalIF":9.4,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144088211","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}

{"title":"Tensile plasticity in amorphous microwires: The role of ion irradiation-induced gradient rejuvenation","authors":"Shuang Su ,&nbsp;Myeong Jun Lee ,&nbsp;Wook Ha Ryu ,&nbsp;Bo Huang ,&nbsp;Zhiliang Ning ,&nbsp;Yongjiang Huang ,&nbsp;Wanxia Huang ,&nbsp;Qingxi Yuan ,&nbsp;Jianfei Sun ,&nbsp;Daniel Sopu ,&nbsp;Eun Soo Park","doi":"10.1016/j.ijplas.2025.104371","DOIUrl":"10.1016/j.ijplas.2025.104371","url":null,"abstract":"<div><div>Amorphous alloys possess exceptional mechanical properties such as high strength and elasticity but suffer from limited tensile plasticity at room temperature, categorizing them as quasi-brittle materials. Ion irradiation has emerged as a promising method for improving their plasticity by inducing gradient rejuvenation structures that modify the distribution of free volume. In this study, H⁺ irradiation was applied to amorphous microwires (AMs), introducing a nonlinear gradient rejuvenation structure with thickness of ∼1.76 μm, which features a free volume distribution that first increases to a certain depth and then decreases from the surface to the interior. It not only effectively hinders the propagation of the dominant shear band (SB) at the interface between high and low free volume regions but also promotes the formation and branching of numerous fine SBs within the rejuvenated region. The combination of these two effects results in significant enhancement of the tensile plasticity to ∼ 2.97 % while maintaining high yield strength (1680 MPa) of AMs. This outcome provides insights into the mechanisms enabling improved plasticity and highlights the potential of nonlinear gradient rejuvenation as a strategy to optimize the mechanical properties of bulk amorphous alloys, offering a promising pathway for developing next-generation high-performance metallic materials.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"190 ","pages":"Article 104371"},"PeriodicalIF":9.4,"publicationDate":"2025-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144088061","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}

{"title":"Anisotropic phase-field crystal plasticity modelling of fracture in nickel-based superalloy","authors":"Qiangang Xu ,&nbsp;Kai Pan ,&nbsp;Yonghui Chen ,&nbsp;Zhen Zhang","doi":"10.1016/j.ijplas.2025.104368","DOIUrl":"10.1016/j.ijplas.2025.104368","url":null,"abstract":"<div><div>Accurately predicting anisotropic damage evolution in crystalline metals remains a challenging topic due to the multiscale nature of fracture. Microstructures play a critical role in influencing crack deflection at the macroscale. To study the relations among anisotropic deformation, crack initiation and propagation, an anisotropic phase-field crystal plasticity model has been developed for nickel-based superalloys. This model differs from conventional approaches in formulating the critical energy release rate as a function of preferentially activated slip or cleavage planes, rather than merely considering it as an isotropic quantity. This development not only allows effective representation of crack initiation due to local anisotropy introduced by slip activation, but also enables a more accurate representation of crystallography-dependent fracture behavior.</div><div>The performance of proposed method will be demonstrated to characterize crack initiation and propagation in nickel-based single-crystal and polycrystal superalloys. The proposed anisotropic phase field method has been found to be consistent with generalized maximum energy release rate criterion. The findings highlight the significant influence of crystallographic orientation on the crack formation in single crystals. Increased geometrically-necessary dislocation (GND) density has been observed along the activated slip directions, particularly for those near the crack tip. The model capability has also been exhibited in characterizing crack deflection within polycrystalline microstructures. The model is further verified against available experiments reported in recent literatures, by virtue of simultaneously comparing the stress-strain response and crack growth.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"190 ","pages":"Article 104368"},"PeriodicalIF":9.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066020","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}

{"title":"Mesoscopic origin of damage nucleation of Mg-RE-Zn alloys containing LPSO phase","authors":"Qiankun Li,&nbsp;Li Jin,&nbsp;Fenghua Wang,&nbsp;Shuai Dong,&nbsp;Jian Zeng,&nbsp;Fulin Wang,&nbsp;Jie Dong","doi":"10.1016/j.ijplas.2025.104367","DOIUrl":"10.1016/j.ijplas.2025.104367","url":null,"abstract":"<div><div>The role of the long-period stacking order (LPSO) phase in damage initiation within magnesium alloys remains inadequately understood. This study investigates the influence of the LPSO phase on damage nucleation and toughness in Mg-RE-Zn alloys, utilizing in-situ tensile testing combined with scanning electron microscopy and digital image correlation (SEM-DIC) to capture mesoscale strain distribution. Results identify the incoherent α-Mg/LPSO interface as the primary site of damage due to its inherent weakness. Damage nucleation is driven by strain gradients resulting from strain localization, which is governed by the strain compatibility factor (<em>m_k</em> value) and associated with high local stress from dislocation accumulation. Secondary damage occurs within LPSO blocks, where their higher elastic modulus prevents stress relief through plastic deformation. Thermo-mechanical processing offers strategies to mitigate these issues by enhancing intergranular strain compatibility (increasing <em>m_k</em> values through grain orientation adjustments) and refining LPSO blocks to improve dispersion strengthening. These measures help counteract the reduction in plasticity caused by damage at the α-Mg/LPSO interface. Furthermore, the main damage nucleation model provides a predictive framework for identifying potential decohesion sites at incoherent α-Mg/LPSO interfaces based on <em>m_k</em> values and grain orientation.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"190 ","pages":"Article 104367"},"PeriodicalIF":9.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946178","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}

{"title":"A dual-scale stochastic analysis framework for creep failure considering microstructural randomness","authors":"Weichen Kong ,&nbsp;Yanwei Dai ,&nbsp;Xiang Zhang ,&nbsp;Yinghua Liu","doi":"10.1016/j.ijplas.2025.104366","DOIUrl":"10.1016/j.ijplas.2025.104366","url":null,"abstract":"<div><div>Creep failure under high temperatures is a complex multiscale and multi-mechanism issue involving inherent microstructural randomness. To investigate the effect of microstructures on the uniaxial/multiaxial creep failure, a dual-scale stochastic analysis framework is established to introduce the grain boundary (GB) characteristics into the macroscopic analysis. The GB degeneration-dominated creep failure of nickel-base superalloy Inconel 617 under long-term creep is considered in this study. Firstly, the damage mechanisms of GBs are investigated based on the crystal plasticity finite element (CPFE) method and cohesive zone model (CZM). Subsequently, based on the obtained GB damage evolution, a novel Monte Carlo (MC) approach is proposed to quantify the randomness of macroscopic creep behavior based on the statistical feature of GB orientation and area distribution. Finally, a dual-scale stochastic multiaxial creep damage model is established to incorporate the influence of the random GB orientation and area distribution. With the numerical application of the proposed creep damage model, the random initiation and growth of creep cracks in the uniaxial tensile specimen and the pressurized tube are captured and analyzed. The proposed stochastic framework effectively considers the inherent randomness introduced by GB characteristics and efficiently realizes full-field multiscale calculations. It also shows its potential applications in safety evaluation and life prediction of creep components and structures under high temperatures.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"190 ","pages":"Article 104366"},"PeriodicalIF":9.4,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931023","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}

{"title":"Promising pathways for balancing strength and ductility in chemically complex alloys with medium-to-high stacking fault energies","authors":"Shanshan Liu ,&nbsp;Tongtong Sun ,&nbsp;Zongde Kou ,&nbsp;Xiaoliang Han ,&nbsp;Qingwei Gao ,&nbsp;Jiyao Zhang ,&nbsp;Xiaoming Liu ,&nbsp;Lai-Chang Zhang ,&nbsp;Jiri Orava ,&nbsp;Kaikai Song ,&nbsp;Lijun Xiao ,&nbsp;Jürgen Eckert ,&nbsp;Weidong Song","doi":"10.1016/j.ijplas.2025.104358","DOIUrl":"10.1016/j.ijplas.2025.104358","url":null,"abstract":"<div><div>Emerging chemically complex alloys (CCAs) with medium-to-high stacking fault energies (SFEs) offer significant potential as advanced materials, yet achieving the balance between strength and ductility remains challenging. This study explores the strategic control of partial recrystallization in Al_8.3Co_16.7Cr_13.3Fe_16.7Ni_41.7V_3.3 CCAs to engineer micron-scale heterogeneous structures featuring unevenly distributed L1₂ nanoprecipitates. The optimized microstructure comprises finely recrystallized regions with high-angle grain boundaries (HAGBs), coarsely unrecrystallized regions with low-angle grain boundaries (LAGBs), and deformation-defect-rich transition (DDRT) zones where both grain boundary types coexist. This architecture enables synergistic strengthening mechanisms, including grain boundary strengthening, precipitation strengthening, dislocation strengthening, and hetero-deformation-induced (HDI) strengthening, resulting in an exceptional yield strength of up to 1623 MPa. During plastic deformation, the dislocation pile-up and accumulation aided by interactions with nanoprecipitates and GBs balance strain softening caused by shear band propagation, leading to relatively low but steady work-hardening rates (WHRs). As deformation progresses, increasingly complex interactions further promote the formation of pronounced dislocation pile-ups, multiplication, SFs, Lomer-Cottrell (L-C) lock networks, and the 9R phase transformation within DDRT zones, collectively contributing to continuous WHRs. As a result of these synergistic mechanisms, the material achieves an ultimate tensile strength of ∼1700 MPa and a total elongation of ∼17.2 %, demonstrating enhanced ductility without sacrificing strength. This work highlights the potential of localized DDRT zones to enable controlled phase transformations in CCAs with medium-to-high SFEs, providing a promising pathway for designing high-performance materials.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"190 ","pages":"Article 104358"},"PeriodicalIF":9.4,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143905587","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}

{"title":"Heterointerface-induced stacking fault/dislocation modulation: A way to enhance work hardening and ductility in micro/nano-reinforced aluminum composites","authors":"Farhad Saba ,&nbsp;Elham Garmroudi Nezhad ,&nbsp;Kang Wang ,&nbsp;Bo Cui ,&nbsp;Daijun Hu ,&nbsp;Kolan Madhav Reddy ,&nbsp;Chao Yang ,&nbsp;Genlian Fan ,&nbsp;Zhanqiu Tan ,&nbsp;Zhiqiang Li","doi":"10.1016/j.ijplas.2025.104357","DOIUrl":"10.1016/j.ijplas.2025.104357","url":null,"abstract":"<div><div>The potential of utilizing bimodal microstructures (including reinforcements and grains) with a high density of heterointerfaces in tailoring defects has not been well understood in particulate-reinforced aluminum matrix composites (PRAMCs). Inspired by this architecture, we developed a micro-B₄C/nano-MgO+CNTs-reinforced bimodally-grained 6xxx aluminum alloy composite with tailored internal stress distribution and high-density heterointerface-induced wide stacking faults (SFs). The evolution of linear/planar defect substructures during deformation was studied to explore the microstructural origins of enhanced work hardening and ductility. The novel micro/nano-reinforced composite exhibited significantly higher work hardening and ductility compared to the composite containing only microparticles. This was attributed to multiple heterointerface-induced mechanisms, including hetero-deformation-induced (HDI) hardening, activation of multiple slip systems, Lomer-Cottrell (L-C) locks, and deformation-induced SF networks. These deformation mechanisms allow the composites to exhibit an enhanced strength-ductility combination via <em>in situ</em> reduction of the mean free paths of dislocations. In addition, molecular dynamics (MD) simulation confirmed the high efficiency of <span>l</span>-C locks in pinning dislocations and strengthening. A semiquantitative model was developed to analyze the influence of heterointerfaces on SF width. This study effectively demonstrates the potential of introducing numerous heterointerfaces through bimodal reinforcements/grains, which can be applied to other composites, offering a promising prototype for designing strong yet ductile materials for technological applications via modulating defects.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"190 ","pages":"Article 104357"},"PeriodicalIF":9.4,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893953","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}

{"title":"Lamellar microstructure enables exceptional fatigue resistance in a medium-entropy alloy manufactured by integrated directed energy deposition with interlayer rolling","authors":"Yufei Chen ,&nbsp;Tiwen Lu ,&nbsp;Haitao Lu ,&nbsp;Xiaoqi Hu ,&nbsp;Ning Yao ,&nbsp;Kaishang Li ,&nbsp;Xiyu Chen ,&nbsp;Yunjie Bi ,&nbsp;Binhan Sun ,&nbsp;Xian-Cheng Zhang ,&nbsp;Shan-Tung Tu","doi":"10.1016/j.ijplas.2025.104349","DOIUrl":"10.1016/j.ijplas.2025.104349","url":null,"abstract":"<div><div>Directed energy deposition (DED) offers higher manufacturing efficiency and material utilization, making it suitable for producing large-sized structural components. However, due to columnar coarse grains and manufactured defects, how to remarkably elevate the fatigue resistance of DED-fabricated face-centered cubic (FCC) materials is an important yet technically challenging issue. To address the challenge, this study employed a medium-entropy FCC alloy, (CoCrNi)₉₄Al₃Ti₃, as the base material and adopted a processing strategy that integrates interlayer rolling into DED to controllably introduce lamellar structure, an effective fatigue-resistant microstructure. Through process optimization, the sample with 3-time inter-layer rolling (DED-R3) exhibits a significantly enhanced fatigue resistance and fatigue ratio along the rolling direction (RD), higher than DED sample by 60 % and 48 %, respectively. The lamellar heterostructure introduced by inter-layer rolling consists of alternating coarse and fine grains, with coarse grains accounting for 66.7 % and fine grains for 33.3 %. This lamellar heterostructure resulted from high geometrically necessary dislocation density induced by cold rolling and critical recrystallization temperature through cyclic heating, facilitating columnar-to-equiaxed transition at local positions. The high fatigue resistance of DED-R3 samples was attributed to the simultaneous achievement of cyclic stability and resistance to crack propagation from lamellar heterostructure. On the one hand, quasi-<em>in-situ</em> fatigue experiments were conducted to reveal enhanced crack initiation mechanisms: different from intense plastic strain localization induced grain boundary (GB) or slip band (SB) cracks in DED samples, most cracks in DED-R3 samples initiated from the interaction between SBs and defects. The mitigated surface roughening by lamellar microstructure suppressed the risk of microstructure cracking. On the other hand, the macroscopic deflection induced by the heterostructure interface and the high-frequency deflection by dense GBs collectively reduced the crack propagation rate.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"189 ","pages":"Article 104349"},"PeriodicalIF":9.4,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143890597","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}

{"title":"The role of cryogenic treatment in the relaxation behavior of the elastically rejuvenated metallic glasses","authors":"A.H. Balal ,&nbsp;X.L. Bian ,&nbsp;D.X. Han ,&nbsp;B. Huang ,&nbsp;S.S. Liao ,&nbsp;N. Li ,&nbsp;S. Ali ,&nbsp;Y.D. Jia ,&nbsp;J.C. Qiao ,&nbsp;G. Wang","doi":"10.1016/j.ijplas.2025.104356","DOIUrl":"10.1016/j.ijplas.2025.104356","url":null,"abstract":"<div><div>This research investigates how elastically pre-loaded Zr_52.5Cu_17.9Ni_14.6Al₁₀Ti₅ metallic glass (MG) subjected to cryogenic treatments (CT) affects its relaxation behavior and mechanical properties. The findings reveal that as the elasto-static compression loading (ECL) stress and duration increase, a noticeable improvement in structural rejuvenation will be induced due to the increase of the free volume. From the perspective of the atomic-level stress theory, the dilated atomic structure induced by ECL helps to achieve a synergy of strength and plasticity after CT. The shrinkage after cooling triggers the coalescence of the hard elastic matrix with the soft regions, which results in free volume annihilation and induces partial structural relaxation. Hence, high density regions with lower activation energy and higher yield strength are generated, manifesting an overcoming the strength-plasticity trade-off in MGs. Further investigations show that the <em>β</em>-relaxation activation that occurs after the activation of a small concentration of local low-viscosity regions is closely related to <em>β′-</em>relaxation. It is evidenced that with increasing of ECL stress and time that followed by CT process, the activation energy of <em>β</em>- and <em>β′-</em>relaxation and the viscosity of local liquid-like regions are decreased, while the concentrations of the defective flow units of <em>β</em>- and <em>β′-</em>relaxation are increased. Moreover, ECL and CT can induce structural modifications manifesting in the decrease of the activation energy and the increase of the shear transformation zones (STZs) volume, as compared with the as-cast state. The generalized Maxwell and free volume models serve as the frameworks for understanding the phenomena. These results offer insights into the relationship between the local liquid-like regions excitations and secondary relaxations with the mechanical properties, to develop advanced MGs with fascinating properties.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"189 ","pages":"Article 104356"},"PeriodicalIF":9.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143884290","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}