International Journal of Plasticity最新文献

{"title":"Influence of microstructural heterogeneity on the plastic strain localisation in selective laser melted 18Ni-300 maraging steel","authors":"Wee King Law, Haoliang Wang, Chenghao Song, Kok-Cheong Wong, Chin Seong Lim, Zhenzhong Sun","doi":"10.1016/j.ijplas.2025.104400","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104400","url":null,"abstract":"Plastic strain localisation in selective laser melted (SLM) 18Ni-300 maraging steel under uniaxial tensile loading was characterised via electron backscatter diffraction (EBSD), in-situ tensile experiments, and digital image correlation under the scanning electron microscope (a methodology known as SEM-DIC). Two sample conditions were investigated, namely the as-built (AB) and solution-aging treatment (SAT) conditions. During plastic deformation, the large quantity of equiaxed grains in the AB sample led to grain boundary strengthening, while the presence of densely distributed Ni-based intermetallics in the SAT sample led to strain hardening. SEM-DIC analysis revealed that plastic strain localisation in AB and SAT samples exhibited significant heterogeneity and was highly localised. Slip was identified as the main deformation mechanism for both AB and SAT samples, and preferentially occurred in grains with increased internal misorientation. Five or more independent slip systems were active in the investigated grains of AB and SAT samples during plastic deformation. The combined kinematics of the active slip systems were reflected in the in-plane deformation behaviour for the investigated grains (i.e. G2 in AB sample and G8 in SAT sample). The findings of the present work would provide fundamental insights into tailoring the material’s microstructure for optimised performance in industrial applications.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"33 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337565","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":"Atomic-scale deformation mechanisms in metal nanocomposites with intragranular amorphous nanoparticles","authors":"Chenjun Ye, Shaofan Ge, Bingkun Zou, Y. Morris Wang, Di Zhang, Jun Ding, Kang Wang, Zan Li","doi":"10.1016/j.ijplas.2025.104398","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104398","url":null,"abstract":"Dispersion strengthening, a well-established approach for enhancing the mechanical properties of metallic materials, typically utilizes crystalline dispersions, such as intermetallic or ceramic particles. Recent studies have shown that copper-based nanocomposites reinforced with intragranular amorphous B₄C nanoparticles, fabricated via additive manufacturing, exhibit significantly improved strength and ductility. In this study, we employ molecular dynamics (MD) simulations to investigate the atomic-level mechanisms responsible for the enhanced mechanical performance of these nanocomposites. Compared to crystalline dispersions, the intragranularly dispersed amorphous B₄C nanoparticles exhibit superior dislocation absorption and emission capabilities, owing to their inherent free volume and structural disorder. As a result, the surrounding copper matrix experiences reduced stress concentration and is better able to absorb and distribute strain energy, thereby delaying failure. Notably, the amorphous nanoparticles undergo densification during deformation via bond-switching and shear transformations in relatively loosely packed local regions, which contributes to the higher strain hardening rate. The dislocation dynamics predicted by MD simulations are validated through in-situ transmission electron microscopy experiments, and the strain-hardening behavior is consistent with prior experimental findings. This work provides a physical foundation for improving the mechanical properties of metallic materials through the use of amorphous dispersions.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"29 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144334937","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":"Achieving superior mechanical properties over a wide temperature range in NiCoVTa medium-entropy alloy via semi-coherent nanolamellar structure","authors":"Weijin Cai ,&nbsp;Qiang Long ,&nbsp;Du Cheng ,&nbsp;Yi Liu ,&nbsp;Kang Wang ,&nbsp;Meiqi Duan ,&nbsp;Weiying Huang ,&nbsp;Xu Zhang ,&nbsp;Min Song ,&nbsp;Zhangwei Wang","doi":"10.1016/j.ijplas.2025.104393","DOIUrl":"10.1016/j.ijplas.2025.104393","url":null,"abstract":"<div><div>This study introduces a diffusion-rate-adaptive strategy for designing a high-performance NiCoV_0.9Ta_0.1 medium-entropy alloy (MEA) strengthened by semi-coherent κ-phase nanolamellae, achieving exceptional strength-ductility synergy across a wide temperature range (77–923 K). Guided by an Integrated Computational Materials Engineering (ICME) approach that combines Calculation of Phase Diagram (CALPHAD) and Density Functional Theory (DFT), Ta addition is screened for sluggish diffusion to effectively restricts κ-lath thickening, leading to the formation of a nanoscale semi-coherent lamellar structure. The resulting ultrahigh strength originates from the substantial strengthening effect of the nanolamellar structure, coupled with synergistic contributions from grain size strengthening and resistance stress from the matrix. Furthermore, the formation of coherent nanoscale L1₂ precipitates during elevated temperature deformation compensates for the strength loss observed at 923 K. The remarkable strain hardening behavior arises from the interaction between κ laths and dislocations, i.e., initial dislocation pile-ups at the κ laths enhancing the hardening rates, while subsequent dislocation shearing and stacking faults (SFs) activation in the κ laths relieving stress concentrations, synergistically stabilizing plastic deformation. Additionally, deformation-induced dislocation substructures, including 9R phases, nanotwins, and dislocation tangles, contribute to the high level of strain hardening between 77 K and 723 K. At 923 K, dense SFs, generated through the interaction of L1₂ precipitates with dislocations in the matrix, facilitate Lomer-Cottrell locks formation and shear κ laths, resulting in anomalous hardening. This work establishes a diffusion-rate-mediated semi-coherent nanolamellar structure design paradigm for advanced M/HEAs, with significant promise for extreme‑temperature applications.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"191 ","pages":"Article 104393"},"PeriodicalIF":9.4,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144308115","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":"Revealing crack resistance in gradient nano-grained CoCrFeMnNi high-entropy alloys: A molecular dynamics study","authors":"Xin Zheng ,&nbsp;Xin Du ,&nbsp;Junhao Wu ,&nbsp;Siyao Shuang ,&nbsp;Jianfeng Zhao ,&nbsp;Qianhua Kan ,&nbsp;Xu Zhang","doi":"10.1016/j.ijplas.2025.104392","DOIUrl":"10.1016/j.ijplas.2025.104392","url":null,"abstract":"<div><div>Gradient nano-grained high-entropy alloys (HEAs) offer a promising route to concurrently enhance strength and toughness, yet the atomistic mechanisms governing their fracture resistance remain elusive. In this study, molecular dynamics (MD) simulations were employed to unravel the crack propagation behavior of gradient nano-grained CoCrFeMnNi HEA (G-HEA) containing either a central or surface crack. Compared with its homogeneous counterpart and pure Ni, G-HEA exhibits pronounced crack-tip passivation and ductile crack propagation, driven by dislocation nucleation and amorphous layer formation at the crack front. Notably, the gradient structure suppress central crack propagation while promoting surface crack advancement through regulation of bilateral dislocation activity. As deformation proceeds, strain-localized shear bands gradually erode the gradient structure’s toughening benefit, leading to convergence in crack growth rates between G-HEA and H-HEA. These findings demonstrate the significant role of gradient nanostructures in modulating fracture behavior and provide atomic-scale insights for toughening design in high-entropy alloys.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"191 ","pages":"Article 104392"},"PeriodicalIF":9.4,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297302","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 driving force for twin boundary migration in phase field model coupled to crystal plasticity finite element","authors":"Linfeng Jiang, Guisen Liu, Peipeng Jin, Yao Shen, Jian Wang","doi":"10.1016/j.ijplas.2025.104397","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104397","url":null,"abstract":"Deformation twinning, a critical deformation mechanism in metal with low-symmetry crystal structures, accommodates localized shear and reorientates a domain with a specific shear and rotation angle. Twin propagation and thickening occur via twinning dislocations/disconnections at the atomic scale, while at larger scales they are governed by the migration of twin boundaries. Phase field (PF) and other continuum methods for modeling deformation twinning often incorporates self-stress effects arising from boundary defects. These self-stress fields, which are singular or discontinuous, introduce artificial forces that distort interface behavior, leading to inaccuracies in predicting interface migration and microstructure evolution. To address this issue, we propose a stress correction scheme that diminishes self-stress effects on the migration of twin interfaces. By analyzing stress field characteristics associated with three-dimensional twins with sharp or diffuse interfaces using dislocation theory and crystal plastic finite element (CPFE) method, we introduce a “correction zone” to redefine the driving force. This approach interpolates stress outside the corrected region to provide an approximate representation of the interface driving force. Validation within the CPFE framework confirms that the scheme effectively diminishes self-stress influences. Finally, we implement the correction scheme in the CPFE-PF model to simulate the dynamic evolution of a three-dimensional twin and demonstrate the twin interface migration behavior compared to the scenario that using the stress containing self-stress as driving force.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"38 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144296268","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 general, flexible and analytical yield criterion framework developed from a novel strategy: Gradual surface-distortion","authors":"Yao Zhou,&nbsp;Qi Hu,&nbsp;Jun Chen","doi":"10.1016/j.ijplas.2025.104394","DOIUrl":"10.1016/j.ijplas.2025.104394","url":null,"abstract":"<div><div>Yield criterion with concise parameters and high accuracy has always been recommended for industrial applications. Based on a novel modeling strategy of gradual surface-distortion (GSD), an analytical yield criterion framework is constructed under the associated flow rule, integrating simplicity, generality and flexibility. Derived from structures of SY2009 criterion, R-value and curvature control terms with independent parameter calibration are developed, resulting in yield surface distortion occurring gradually. Three curvature variables are integrated into a single factor through empirical formulas without additional pure shear and plane strain tension experiments. This framework is an eighth-order homogeneous polynomial, with all parameters uniquely determined through a set of mechanical tests conducted under plane stress conditions. Initially, a simplified GSD version is constructed to characterize yield loci of BCC and FCC materials, requiring a minimum of only seven experimental data (<span><math><msub><mi>T</mi><mn>0</mn></msub></math></span>, <span><math><msub><mi>T</mi><mn>45</mn></msub></math></span>, <span><math><msub><mi>T</mi><mn>90</mn></msub></math></span>, <span><math><msub><mi>T</mi><mrow><mi>EB</mi></mrow></msub></math></span>, <span><math><msub><mi>r</mi><mn>0</mn></msub></math></span>, <span><math><msub><mi>r</mi><mn>45</mn></msub></math></span>, <span><math><msub><mi>r</mi><mn>90</mn></msub></math></span>). Subsequently, by introducing stresses and R-values in two optional directions, an extended GSD version is proposed to enhance strong anisotropy description. The generality and accuracy of this framework are validated across 19 different materials to predict yield locus, uniaxial stress and R-value curves. The results demonstrate that the simplified model almost replicates Yld2000–2d and enables accurate prediction in the evolution of yield locus under anisotropic hardening. For strongly anisotropic materials, the extended model exhibits high prediction accuracy. By using an implicit finite element method, this framework accurately predicts the earing profile in cup drawing of AA3104-H19. Besides, the convexity trust-domain and the generality of curvature variables are discussed.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"191 ","pages":"Article 104394"},"PeriodicalIF":9.4,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144296269","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":"Multiscale Analysis and Modeling of Nano-coating Fracture Induced by Inhomogeneous Plastic Deformation of Polycrystalline Metallic Substrate","authors":"Chuanzheng Li, Zhutian Xu, Jilai Wang, Linfa Peng","doi":"10.1016/j.ijplas.2025.104396","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104396","url":null,"abstract":"Nanocrystalline coatings are critical for extensive applications, yet their fracture on polycrystalline metallic substrates severely deteriorates the performance. Nevertheless, the underlying coating fracture mechanism correlated with inhomogeneous substrate plasticity remains ambiguous, and accurately predicting the crack formation is challenging. To address these issues, this study comprehensively characterized 100-nm niobium coating cracks on stainless-steel sheets and developed a multiscale model to predict coating fracture dominated by substrate plasticity. In particular, different coating cracks were identified and classified into three patterns based on their locations: on intragranular slip bands, grain boundaries, and twin boundaries of the substrate. Crystallographic calculations and statistical analyses demonstrated that the coating fractures were induced by grain and sub-grain scale strain localization of the substrate, which was incorporated within a multiscale modeling framework. For nanocrystalline coatings, molecular dynamics simulations were employed to derive the cohesive zone model in the extended finite element method. The coating fracture was subsequently simulated on a representative volume element of the substrate containing discrete slip bands, which was developed based on crystal plasticity and calibrated using slip steps. Microscopic substrate slips with Burgers vectors oriented at 30° to 50° relative to the surface were revealed to trigger coating cracks, which were generalized with a fracture parameter to be efficiently implemented in macroscopic simulations. Compared to traditional homogeneous models, the developed model enabled precise identification of all coating crack patterns in practical samples. This multiscale modeling procedure and these in-depth insights facilitate the prevention of failure in engineered components with nano-coatings.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"51 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290071","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":"Deposited Ductile-GPa CoCrNi-based FCC medium entropy alloy with continuously precipitation by directed energy deposition-Arc","authors":"Liuwei Wu ,&nbsp;Xizhang Chen ,&nbsp;Ming Wen ,&nbsp;Kang Peng ,&nbsp;Yunxiu Chao","doi":"10.1016/j.ijplas.2025.104395","DOIUrl":"10.1016/j.ijplas.2025.104395","url":null,"abstract":"<div><div>An L1₂-strengthened Co₃₀Cr₁₈Ni₄₂Al₅Ti₅ medium-entropy alloy was fabricated via directed energy deposition (DED)-Arc technique, focusing on investigating the modulation mechanism of the process on L1₂ phase precipitation behavior. The results showed that the high heat input and moderate cooling rate features of DED-Arc process effectively suppressed the discontinuous precipitation (DP) behavior: the coarse columnar crystal structure significantly reduces the number of grain boundaries; moderate cooling rate promotes homogeneous distribution of Al/Ti elements and eliminates grain boundary segregation; This “coarse grain-element homogenization” synergy results in a high-density distribution of the L1₂ phase within the grain through a continuous precipitation (CP) behavior. Directly deposited alloys exhibit gigapascal strength (∼1090 MPa) and high uniform elongation (∼28.4 %). Furthermore, subsequent heat treatment of the deposited alloys confirmed the thermal stability of the continuous L1₂ precipitation, with increased L1₂ phase fraction while maintaining “FCC+L1₂” structure. This work provides guidance for the fabrication of L1₂-strengthened high-entropy alloys and medium-entropy alloys with excellent mechanical properties by additive manufacturing.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"191 ","pages":"Article 104395"},"PeriodicalIF":9.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144288588","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":"Interdependent slip and twinning behaviors for improving cryogenic mechanical properties in Ti-6Al-3Nb-2Zr-1Mo alloy additively manufactured by electron beam wire-fed","authors":"Guoqiang Zhu ,&nbsp;Liang Wang ,&nbsp;Baoxian Su ,&nbsp;Mengjia Yao ,&nbsp;Enbo Wei ,&nbsp;Botao Jiang ,&nbsp;Jiaxin Du ,&nbsp;Weikun Zhang ,&nbsp;Yong Zhang ,&nbsp;Ruirun Chen ,&nbsp;Yanqing Su ,&nbsp;Jingjie Guo","doi":"10.1016/j.ijplas.2025.104390","DOIUrl":"10.1016/j.ijplas.2025.104390","url":null,"abstract":"<div><div>α-Ti with hexagonal close-packed (HCP) structure offers exceptional strength-to-weight ratios and structural stability, becoming a promising material for extreme conditions. However, there are few reports on additively manufactured Ti alloys for cryogenic application, primarily due to the detrimental effects of porosity, inclusions, oxidation and residual stresses on mechanical performance. And the strength-ductility trade-off also challenges cryogenic applications of α-Ti alloys. This work successfully demonstrates the feasibility of electron beam wire-fed additive manufacturing (EBWF AM) for fabrication of high-performance cryogenic Ti alloys. The virtually dense Ti-6Al-3Nb-2Zr-1Mo (Ti6321) alloys exhibit yield strength of 1194 MPa and total elongation of 18.8 % at cryogenic conditions, with ∼30 % and ∼64 % improvements in ductility and strength compared to room temperature. The highly attractive cryogenic ductility is ascribed to the interdependent slip and twinning behavior in mediating cryodeformation. Specifically, the prismatic and basal 〈<em>a〉</em> slips become primary deformation modes. However, the basketweave morphology benefits from more 〈<em>c</em> <em>+</em> <em>a〉</em> dislocations, abundant geometrically necessary dislocations and dislocation delocalization, helping to improve cryogenic ductility and work hardening. Also, the inhibition of macro shear bands makes a contribution to the improved cryogenic ductility owing to the co-deformability of both phases and random α variants, facilitating deformation delocalization and mitigating localization effect. Instead, the sub-millimeter colonies in the fully lamellar microstructure induce more deformation twinning, while the enhanced slip lengths and planar slip propensity exacerbate strain localization and sample-scale macro shear banding, leading to premature failure. These findings highlight the superior cryogenic strength-ductility combination and important contribution of dislocation-dominated plastic cryodeformation in the basketweave microstructure. This work demonstrates the potential of EBWF for fabricating advanced structural materials for cryogenic applications and advances the understanding of Ti6321 cryodeformation behavior, offering insights for developing high-performance Ti alloys.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"191 ","pages":"Article 104390"},"PeriodicalIF":9.4,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254380","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":"Dynamic carbon diffusion induced sustainable strain-hardening at quasi-static strain rates in high-C Al-added austenitic steels","authors":"Dong Liu ,&nbsp;Yong Hou ,&nbsp;Dapeng Yang ,&nbsp;Guodong Wang ,&nbsp;Hongliang Yi","doi":"10.1016/j.ijplas.2025.104391","DOIUrl":"10.1016/j.ijplas.2025.104391","url":null,"abstract":"<div><div>The design of strain-hardening behavior in steel typically involves controlling the activation of deformation mechanisms and the evolution of microstructure during deformation. This research proposes a novel strategy to promote sustained hardening by leveraging dynamic strain aging (DSA) through a high-C design to pin dislocations, thus enhancing tensile strength and ductility at quasi-static strain rates, independent of microstructure tailoring. This study reveals that lower strain rates are more conducive to achieving greater strain-hardening capacity in the new alloys within the thermally-activated regime (strain rates of 10^–3 to 10^–1 s^–¹). Intriguingly, heavily deformed microstructures show reduced substructure density at lower strain rates, yet exhibit enhanced flow stress. This discrepancy indicates that the observed changes in the alloy’s hardening deviate from conventional substructure evolution law. Transmission electron microscopy and electron backscatter diffraction analyses show that low strain rates inhibit the formation of additional twin systems and promote a predominantly cellular structure dominated by cross-slip. Theoretical calculations of dislocation dynamics and carbon diffusion rates confirm that DSA dominates strain rate sensitivity. Tensile tests at elevated temperatures demonstrate notable improvements in both ultimate tensile strength and ductility. This observation, combined with cyclic aging-reloading tests, underscores the critical role of DSA in the hardening of C-enriched alloys. By demonstrating the substantial impact of dynamic interstitial diffusion on strain-hardening and strain rate response, this study confirms that DSA induces substantial hardening at ambient temperature. This results in the alloy at a strain rate of 10^–3 s^–¹ exhibiting a strain-hardening capacity exceeding 100 MPa higher than that at 10^–1 s^–¹, while also achieving improved resistance to instability and an elongation increase of nearly 10 %. Despite limited twinning and dislocation density, the alloy achieves superior mechanical properties through solute-dislocation interactions, surpassing predictions of conventional hardening models that over-rely on substructure evolution. This study offers a promising avenue for designing future alloys with superior strength and ductility at quasi-static strain rates, potentially overcoming the traditional strength-ductility trade-off via solute-dislocation interactions.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"191 ","pages":"Article 104391"},"PeriodicalIF":9.4,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144237320","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}