International Journal of Plasticity最新文献

A through-process model for predicting the precipitation evolution and mechanical property of stress-aged Al-Zn-Mg-Cu alloy 一种预测应力时效Al-Zn-Mg-Cu合金析出演变及力学性能的全过程模型

IF 9.8 1区材料科学

International Journal of Plasticity Pub Date : 2025-07-26 DOI: 10.1016/j.ijplas.2025.104426

Zinan Cheng, Cunsheng Zhang, Zhenyu Liu, Zijie Meng, Xiuwei Xing, Liang Chen, Guoqun Zhao

{"title":"A through-process model for predicting the precipitation evolution and mechanical property of stress-aged Al-Zn-Mg-Cu alloy","authors":"Zinan Cheng, Cunsheng Zhang, Zhenyu Liu, Zijie Meng, Xiuwei Xing, Liang Chen, Guoqun Zhao","doi":"10.1016/j.ijplas.2025.104426","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104426","url":null,"abstract":"As one of the most commonly used metals, Al-Zn-Mg-Cu alloys are now facing the increasing performance challenges caused by the more stringent service environment in modern industry. Through acting the external stress on material, the stress aging (SA) technique has been applied as an effective strategy to improve the comprehensive performances of precipitate-strengthened alloys. To further unveil the influence mechanisms of external stress, this work establishes a novel through-process model framework, including the classical Kampmann-Wagner numerical (KWN) model and viscoplastic self-consistent (VPSC) model. The former tracks the precipitation evolution and offers the precipitate information for the later VPSC calculation. The commonly-formed precipitate free zone (PFZ) is systematically investigated and modeled, achieving a more comprehensive description of the aging process. Furthermore, the stress-induced nucleation and growth acceleration of precipitation is described by the innovatively-proposed elastic energy caused by applied stress. The proposed model is validated by a wide range of stress (0 to 250 MPa) and gives an accurate prediction for both the precipitation evolution and the subsequent mechanical properties. It is demonstrated that the stress-induced precipitation acceleration effectively enhances the alloy strength for the early aging time, while this enhancing effect is gradually weakened with increasing aging time. Furthermore, the strength variation for different SA conditions mainly depends on the competition between precipitation strengthening and PFZ weakening.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"97 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710712","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

Strain localization induced by closely spaced lamellae structure in a Mg alloy containing long period stacking ordered structure 含长周期堆积有序结构的镁合金中紧密片层结构引起的应变局部化

IF 9.8 1区材料科学

International Journal of Plasticity Pub Date : 2025-07-25 DOI: 10.1016/j.ijplas.2025.104423

Zhao Nie, Fulin Wang, Jiyu Li, Chuanlai Liu, Chaoyu Zhao, Shuchi Sanandiya, Mathieu Calvat, Dhruv Anjaria, Jian Zeng, Shuai Dong, Fenghua Wang, Li Jin, Jie Dong, Jean-Charles Stinville

{"title":"Strain localization induced by closely spaced lamellae structure in a Mg alloy containing long period stacking ordered structure","authors":"Zhao Nie, Fulin Wang, Jiyu Li, Chuanlai Liu, Chaoyu Zhao, Shuchi Sanandiya, Mathieu Calvat, Dhruv Anjaria, Jian Zeng, Shuai Dong, Fenghua Wang, Li Jin, Jie Dong, Jean-Charles Stinville","doi":"10.1016/j.ijplas.2025.104423","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104423","url":null,"abstract":"The Mg alloys containing the long period stacking ordered (LPSO) phase are a major research focus for their desirable mechanical properties, yet the role of the LPSO phase in the form of intragranular lamellae in tensile ductility has been elusive. Here, we investigate strain localization induced by LPSO lamellae in a Mg-Gd-Y-Zn-Zr alloy using correlated microstructure characterization, high-resolution full-field strain measurements and crystal plasticity simulations. The aged alloy containing lamellae exhibits reduced ductility due to intragranular microcracks along basal planes, contrasting with grain boundary cracks in the lamellae-free counterpart. Heaviside-digital image correlation (DIC) analyses reveal that the lamellar structure intensifies basal slip activity, leading to enhanced strain localization compared to the same magnesium alloy without this structural feature. Site-specific characterizations aided by atomic force microscopy (AFM) and transmission electron microscopy (TEM) identified that severe slip steps occur in the Mg matrix between closely spaced lamellae. Parameterized crystal plasticity simulations further revealed that the strain localization on the basal plane originates from the elevated local stress that is raised by the adjacent lamellae of high stiffness, and is exacerbated by high lamellae thickness-to-spacing ratios or volume fractions. Moreover, the promotion of the easy basal slip and suppression of the hard yet desired non-basal slip by lamellae make the deformation mode more restrictive, which is against the requirement for homogeneous deformation. These findings elucidate the potential detrimental effect of lamellae on ductility, thereby providing valuable insights for future design of Mg alloys containing LPSO phases.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"12 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144701716","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

Atomic-scale mechanisms of dislocation-driven ε→γtwin reversion in metastable compositionally complex alloys: insights from experiments and molecular dynamics simulations 亚稳成分复杂合金中位错驱动ε→γ孪晶逆转的原子尺度机制：来自实验和分子动力学模拟的见解

IF 9.8 1区材料科学

International Journal of Plasticity Pub Date : 2025-07-25 DOI: 10.1016/j.ijplas.2025.104432

Junhua Hou, Pengfei Qu, Yuhe Huang, Dongpeng Hua, Chunyu Dong, Qian He, Weizong Bao, Sihao Zou, Ziqi Mei, Bingnan Qian, Jiawen Zhang, Wenjun Lu

{"title":"Atomic-scale mechanisms of dislocation-driven ε→γtwin reversion in metastable compositionally complex alloys: insights from experiments and molecular dynamics simulations","authors":"Junhua Hou, Pengfei Qu, Yuhe Huang, Dongpeng Hua, Chunyu Dong, Qian He, Weizong Bao, Sihao Zou, Ziqi Mei, Bingnan Qian, Jiawen Zhang, Wenjun Lu","doi":"10.1016/j.ijplas.2025.104432","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104432","url":null,"abstract":"The ε→γ<sub>twin</sub> reversion process in metastable face-centered cubic (FCC) alloys remains poorly understood due to its complex, dislocation-mediated nature. In this study, we uncover the atomic-scale mechanisms governing this transformation in a metastable compositionally complex alloy (CCA) with Co<sub>34</sub>Cr<sub>23</sub>Fe<sub>25</sub>Ni<sub>18</sub> wt.% through a combined experimental and computational approach. Quasi-in-situ electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and atomic-resolution imaging reveal that the reversion from ε-martensite to γ nanotwins is not mediated by conventional mechanisms dominated solely by Shockley partial dislocation (SPD) glide. Instead, it proceeds via a cooperative sequence involving SPDs, full dislocations, and Frank partials, alongside boundary relaxation processes. Uniaxial compression along the <001> direction induces ε-martensite formation, which reverts to γ nanotwins upon annealing. Molecular dynamics simulations further elucidate the energetics, showing that the ε→γ<sub>twin</sub> transformation is thermodynamically favored at elevated temperatures. The simulations also highlight the crucial role of stacking fault energy (SFE) in determining ε phase stability and twin formation kinetics. Our findings establish a new mechanistic framework for dislocation-assisted twin reversion in metastable alloys. It not only advances the fundamental understanding of transformation-mediated twinning but also provides strategic insights for microstructural engineering. By leveraging dislocation interactions and transformation pathways, this approach offers a pathway to design advanced materials with superior strength–ductility combinations.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"20 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144701715","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

Strong yet ductile carbide-strengthened niobium alloy fabricated by laser powder bed fusion 激光粉末床熔合制备高韧性碳化物强化铌合金

IF 9.8 1区材料科学

International Journal of Plasticity Pub Date : 2025-07-24 DOI: 10.1016/j.ijplas.2025.104431

Hang Lan, Yanbo Zhang, Kaiju Lu, Xu Li, Yiqing Zhang, Yonggang Tong, Jie Wang, Yongjiang Huang, Zhenfeng Hu, Xiubing Liang

{"title":"Strong yet ductile carbide-strengthened niobium alloy fabricated by laser powder bed fusion","authors":"Hang Lan, Yanbo Zhang, Kaiju Lu, Xu Li, Yiqing Zhang, Yonggang Tong, Jie Wang, Yongjiang Huang, Zhenfeng Hu, Xiubing Liang","doi":"10.1016/j.ijplas.2025.104431","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104431","url":null,"abstract":"Additive manufacturing (AM) of refractory alloys and high-entropy alloys (RHEAs) are gaining increasing interest due to their superior high-temperature strength and low buy-to-fly ratio. However, most of refractory alloys and RHEAs suffered from room temperature (RT) brittleness and hence severe cracking during AM. Here we report the strong yet ductile carbide-strengthened niobium alloy (so-called Nb521) fabricated by laser powder bed fusion (LPBF). The LPBF Nb521 alloy showcases excellent tensile strength-ductility at RT and outstanding specific yield strength at 1200°C, as compared to other promising niobium alloys and RHEAs. The LPBF Nb521 alloy exhibits hierarchical microstructures at various length scales, including irregular-shaped grains, nano-scale dispersed carbides and carbides-decorated low/high-angle grain boundaries. Transmission electron microscopy investigations revealed that the good tensile ductility originates from movement of unusually predominant mixed dislocations. Density functional theory calculations uncovered potential reasons for the sufficient ductility, i.e., higher Rice ductility parameter and lower unstable stacking fault energies than brittle elements. Further analyses pointed out the reasons of high strength of the LPBF alloy and potential directions for pursuing even higher strength. Consequently, this study not only deepens the understanding of deformation mechanisms of carbide-strengthened niobium alloys, but also provides a reference for the further design of strong yet ductile niobium alloys.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"115 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144701719","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

Bayesian inference and GPSR-based void nucleation probability model for polycrystalline Al alloys for spall prediction 基于贝叶斯推理和gpsr的多晶铝合金空穴成核概率模型

IF 9.4 1区材料科学

International Journal of Plasticity Pub Date : 2025-07-21 DOI: 10.1016/j.ijplas.2025.104418

S.K. Gargeya Bhamidipati , Todd Hufnagel , Somnath Ghosh

{"title":"Bayesian inference and GPSR-based void nucleation probability model for polycrystalline Al alloys for spall prediction","authors":"S.K. Gargeya Bhamidipati , Todd Hufnagel , Somnath Ghosh","doi":"10.1016/j.ijplas.2025.104418","DOIUrl":"10.1016/j.ijplas.2025.104418","url":null,"abstract":"<div><div>Spallation is a mechanism of dynamic fracture in materials that occurs when a compressive shock reflects from a free surface as a tensile wave, causing nucleation and growth of spall voids. Predicting the conditions under which spall voids nucleate is an important aspect of designing materials to resist spall failure. This paper describes a computational approach involving porous crystal plasticity modeling and Bayesian inference to predict void nucleation in polycrystalline metals, which can lead to spall. The model has three basic components. The first is a unified porous crystal plasticity finite element model (CPFEM) that (i) covers a wide range of strain rates by incorporating thermally-activated and drag-dominated glide of dislocations causing slip, and (ii) predicts porosity evolution in image-based micromechanical simulations. The second component involves a concurrent model that embeds a 3D statistically-equivalent representative volume element (SERVE) modeled by the crystal plasticity FEM in an exterior domain modeled by continuum plasticity, to handle spurious effects associated with the impact boundary conditions. The third component is a probabilistic model for void nucleation under dynamic loading, utilizing Bayesian inference and genetic programming symbolic regression (GPSR), where nucleation is assumed to be a limiting state of the void evolution process, corresponding to a near-zero initial void volume fraction with a positive void growth rate. The paper illustrates the use of this model by predicting the conditions for void nucleation in a polycrystalline aluminum alloy 7085-T711 under dynamic loading conditions. By accounting for complex phenomena like stress wave propagation, drag effects on plastic slip rates, and void nucleation and growth, the methodology developed in this work provides a powerful tool for determining void nucleation evolution in polycrystalline metals under dynamic loading conditions leading to spallation.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"192 ","pages":"Article 104418"},"PeriodicalIF":9.4,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144677855","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

Indentation size effect in a CoCrNi medium-entropy alloy: roles of partial dislocations and deformation twins CoCrNi中熵合金的压痕尺寸效应：部分位错和变形孪晶的作用

IF 9.4 1区材料科学

International Journal of Plasticity Pub Date : 2025-07-20 DOI: 10.1016/j.ijplas.2025.104428

Xuekun Shang , Zhiyuan Liang , Binbin He

{"title":"Indentation size effect in a CoCrNi medium-entropy alloy: roles of partial dislocations and deformation twins","authors":"Xuekun Shang , Zhiyuan Liang , Binbin He","doi":"10.1016/j.ijplas.2025.104428","DOIUrl":"10.1016/j.ijplas.2025.104428","url":null,"abstract":"<div><div>In this study, we investigated the indentation size effect (ISE) in a CoCrNi medium-entropy alloy using nanoindentation experiments and transmission electron microscopy (TEM) observations. Interestingly, the depth-hardness curves of two grains with different crystal orientations exhibit a crossover phenomenon together with orientation-dependent twinning behaviour. Comprehensive TEM characterization revealed that plastic deformation was accommodated by perfect dislocation slip in the [0 1 1]-oriented grains, whereas it involved dislocation slip, stacking faults, and deformation twins in the [0 0 1]-oriented grain. Partial dislocation slip was found to dominate in the [0 0 1]-oriented grain at very small depths, thereby suppressing dislocation motion and cross-slips, resulting in a higher dislocation density and increased hardness. A modified Nix-Gao model, incorporating partial dislocations with a restriction factor, is proposed to account for the ISE differences between the two grains. Despite substantial twinning in the [0 0 1]-oriented grain at higher loads, the contribution of deformation twins to dislocation accumulation is negligible. The present work highlights the critical roles that partial dislocations play and how they influence the ISE in low stacking-fault energy alloys.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"192 ","pages":"Article 104428"},"PeriodicalIF":9.4,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664465","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 crystal plasticity-based and temperature-dependent multi-phase field model for the ductile fracture of single crystals at elevated temperatures 基于晶体塑性和温度相关的高温单晶韧性断裂多相场模型

IF 9.4 1区材料科学

International Journal of Plasticity Pub Date : 2025-07-18 DOI: 10.1016/j.ijplas.2025.104425

Ao Li, Weiping Hu, Zhixin Zhan, Qingchun Meng

{"title":"A crystal plasticity-based and temperature-dependent multi-phase field model for the ductile fracture of single crystals at elevated temperatures","authors":"Ao Li, Weiping Hu, Zhixin Zhan, Qingchun Meng","doi":"10.1016/j.ijplas.2025.104425","DOIUrl":"10.1016/j.ijplas.2025.104425","url":null,"abstract":"<div><div>In this work, a temperature-dependent multi-phase field model coupled with a crystal plasticity framework is developed to investigate the ductile fracture of single crystals at elevated temperatures. The principle of virtual power at finite deformation is extended to derive multi-phase field formulations, yielding macroscopic and microscopic force balance equations. The accumulated plastic slip on each slip plane is introduced as the driving force for the ductile damage evolution of that plane, which provides clear physical significance for microscale damage analysis. Within the thermodynamic framework, constitutive equations for damaged crystals are derived, including the macroscopic stress constitutive equation and the microscopic phase field constitutive equation. For theoretically incorporating the temperature effect, a temperature-dependent fracture threshold energy governing damage initiation and a temperature-dependent degradation function controlling damage evolution are proposed to explicitly characterize thermal influences. The main contribution of the developed model lies in the explicit modelling of the temperature effect on damage through a thermally coupled free energy function, along with the rigorous derivation of damage constitutive equations within the thermodynamic framework. For numerical implementation, an efficient and robust explicit algorithm is developed to solve the phase field and deformation field. The comparisons between numerical simulations and experimental results demonstrate the good capability of the proposed model. Based on the proposed model, the influence of temperature on the coupling effect between microplasticity and microdamage on slip planes is revealed. This study provides a new insight for ductile fracture modelling of single crystals at elevated temperatures.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"192 ","pages":"Article 104425"},"PeriodicalIF":9.4,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144652514","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

Tuning deformation mechanisms in refractory high-entropy alloys: slip plane preference and dislocation behavior 难熔高熵合金的调谐变形机制：滑移面偏好和位错行为

IF 9.8 1区材料科学

International Journal of Plasticity Pub Date : 2025-07-17 DOI: 10.1016/j.ijplas.2025.104424

Zhiwen Li, Baoxian Su, Chen Liu, Ruirun Chen, Liang Wang, Yanqing Su

{"title":"Tuning deformation mechanisms in refractory high-entropy alloys: slip plane preference and dislocation behavior","authors":"Zhiwen Li, Baoxian Su, Chen Liu, Ruirun Chen, Liang Wang, Yanqing Su","doi":"10.1016/j.ijplas.2025.104424","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104424","url":null,"abstract":"Refractory high-entropy alloys (RHEAs) exhibit exceptional high-temperature strength but typically suffer from limited tensile ductility at room temperature. In this study, we investigate the mechanical properties and underlying deformation mechanisms of single-phase body-centered cubic (BCC) Ti<sub>35</sub>Zr<sub>(35-</sub><em><sub>x</sub></em><sub>)</sub>Hf<em><sub>x</sub></em>Nb<sub>20</sub>Mo<sub>10</sub> (<em>x</em> = 0, 2.5, 5, 7.5, and 10) alloys. Increasing Hf content significantly enhances tensile ductility while maintaining a high yield strength above 1 GPa. Notably, the fracture elongation of Ti<sub>35</sub>Zr<sub>25</sub>Hf<sub>10</sub>Nb<sub>20</sub>Mo<sub>10</sub> alloy is 27.7%, nearly double that of the Hf-free Ti<sub>35</sub>Zr<sub>35</sub>Nb<sub>20</sub>Mo<sub>10</sub> alloy (14.4%). In-situ electron backscatter diffraction EBSD analysis shows that Hf additions promote the activation of the {112} slip plane, whereas the {123} slip plane is consistently active across all compositions. Transmission electron microscopy (TEM) analysis further reveals distinct dislocation behavior depending on the slip plane: screw dislocations dominate on the {110} plane, while edge and mixed dislocations preferentially glide on high-order planes. These wavy mixed dislocations facilitate cross-slip and the development of secondary planar-slip bands, thereby improving strain uniformity and mitigating local stress concentrations. Moreover, kink bands are observed exclusively in Hf-containing alloys. Their formation is associated with the relaxation of localized strain and stress, contributing to improved fracture resistance. Collectively, these findings offer a detailed understanding of the deformation mechanisms in RHEAs and suggest a promising alloy design strategy to simultaneously enhance strength and ductility—critical for structural applications under extreme thermal and mechanical loading conditions.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"2 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144645565","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

Nano grains-induced high tensile strength-plastic strain synergy in martensitic steel 纳米晶粒诱导马氏体钢高抗拉强度-塑性应变协同作用

IF 9.4 1区材料科学

International Journal of Plasticity Pub Date : 2025-07-11 DOI: 10.1016/j.ijplas.2025.104421

Jianquan Wan , Fei Zhang , Jianxun Lu , Chen Hu , Zhuang Shen , Ling Bing Kong , Haihui Ruan , Xiaowei Zuo

{"title":"Nano grains-induced high tensile strength-plastic strain synergy in martensitic steel","authors":"Jianquan Wan , Fei Zhang , Jianxun Lu , Chen Hu , Zhuang Shen , Ling Bing Kong , Haihui Ruan , Xiaowei Zuo","doi":"10.1016/j.ijplas.2025.104421","DOIUrl":"10.1016/j.ijplas.2025.104421","url":null,"abstract":"<div><div>The plasticity is always detrimentally affected by the presence of the delta-ferrite (<em>δ</em>) phase in martensitic steels. This work presents a novel processing strategy employing successive warm-rolling, cold-rolling, and low-temperature annealing to achieve almost complete dissolution of the <em>δ</em> phase in a martensitic steel containing Fe-12Cr-11Ni-1.1Mo-1.7Ti-0.3Al-0.01C (in wt. %). This novel <em>δ</em>-free martensitic steel is primarily composed of nanoscale <em>α</em>′ martensite accompanied with high-density dislocations, demonstrating a ∼4-fold increase in plastic strain (4.82±0.19 %) while maintaining an enhancement of ∼36.4 % in ultimate tensile strength (1855±18 MPa) compared with its <em>δ</em>-containing counterpart fabricated via the conventional method. Nano-grains deformation induces a substantial dislocation accumulation at delayed strains (i.e., >2 %), contributing to a sustained work-hardening capacity and thus preventing early necking. This mechanism allows for greater dislocation-mediated deformation, enabling the high-density dislocations to exhibit an outstanding plasticizing capability while maintaining significant dislocation strengthening.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"192 ","pages":"Article 104421"},"PeriodicalIF":9.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144602993","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

High strain rate Bauschinger response of 6061-T6 Aluminum alloy 6061-T6铝合金的高应变速率包辛格响应

IF 9.4 1区材料科学

International Journal of Plasticity Pub Date : 2025-07-11 DOI: 10.1016/j.ijplas.2025.104422

Bing Du , Yazhou Guo , Yi Ding , Muhammad Atif , Jian Li , Xue Yang , Yulong Li

{"title":"High strain rate Bauschinger response of 6061-T6 Aluminum alloy","authors":"Bing Du , Yazhou Guo , Yi Ding , Muhammad Atif , Jian Li , Xue Yang , Yulong Li","doi":"10.1016/j.ijplas.2025.104422","DOIUrl":"10.1016/j.ijplas.2025.104422","url":null,"abstract":"<div><div>This research aims to explore the Bauschinger effect (BE) of 6061-T6 aluminum alloy under different loading rates and pre-strains. Compression-tension experiments were conducted using a modified electromagnetic Hopkinson bar system (ESHB) within the strain rate of 800 s<sup>-1</sup> and pre-strain range of 1 %-9 %. High-speed photography and Digital Image Correlation (DIC) technology were employed to measure the strain. The experimental results show that under quasi-static loading, the BE intensifies with the increase of pre-strain until reaches 3 %, at which the BE parameter reaches saturation gradually. Under dynamic loading, the BE parameter goes up rapidly before 2 % pre-strain and then reduces continuously as pre-strain increases. Difference in the BE between quasi-static and dynamic loading were investigated by microstructural analysis. The non-monotonic back stress under dynamic loading arises from competition between dynamic strain aging (DSA) enhanced solute pinning at low pre-strains and irreversible dislocation cutting of precipitates at high pre-strains. The suppressed thermal activation stabilizes these substructures through inhibited cross-slip/climb. Based on the experimental results, a strain-rate dependent Armstrong-Frederick (SAF) model and a physical-based (PB) model are proposed. Compared with the traditional Johnson-Cook (JC) model, these two models can describe more accurately the behavior of the material under dynamic cyclic loading, providing effective tools for material performance optimization and engineering applications.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"192 ","pages":"Article 104422"},"PeriodicalIF":9.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144611035","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