International Journal of Plasticity最新文献

{"title":"Prolonged work hardening in bimodal grain structured aluminum matrix composites: a sequential heterostructure effect","authors":"Zhiqi Guo ,&nbsp;Xiaotong Li ,&nbsp;Sijie Wang ,&nbsp;Zhanqiu Tan ,&nbsp;Zhenming Yue ,&nbsp;Bo Cui ,&nbsp;Genlian Fan ,&nbsp;Zhiqiang Li ,&nbsp;Di Zhang","doi":"10.1016/j.ijplas.2025.104485","DOIUrl":"10.1016/j.ijplas.2025.104485","url":null,"abstract":"<div><div>High-strength aluminum matrix composites (AMCs) suffer from poor ductility, due to the limited work hardening capacity. In this study, a remarkable prolonged work hardening is sustained in ultrastrong Al-5Mg matrix composites via an optimized bimodal grain heterostructure, with triple or even fourfold uniform elongation and raised tensile/yield strength. The prolonged work hardening proceeds through two sequential deformation stages. In the first stage with minor strains (&lt;2.5%), a high gradient of geometrically necessary dislocations in soft coarse-grained (CG) zones generates strong back stress, which promotes not only hetero-deformation induced (HDI) hardening but also dislocation multiplication in hard ultrafine-grained (UFG) zones. The work hardening of UFG is thus improved with higher density of dislocations interacting with some nanoparticles. Subsequently, the stress of UFG zones rises sufficiently to induce dispersed microvoids formation within UFG zones, instead of localized cracking at hetero-zone boundaries. Therefore, an effective HDI hardening depending on the well-bonded hetero zones is sustained in the second stage (strain &gt;2.5%). Such a sequential heterostructure effect is analyzed to obtain an appropriate width range of soft zones for bimodal grained AMCs, improving the conventional empirical heterostructure design principle. This work advances the understandings on heterostructured AMCs that when employing intermediate-sized soft zones, the hard UFG zones play a key role in obtaining good ductility, instead of only providing high strength.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104485"},"PeriodicalIF":12.8,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145083954","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":"Functional fatigue and restoration in superelastic NiTi shape-memory alloys","authors":"Junyu Chen ,&nbsp;Wenqiang Wang ,&nbsp;Fei Liu ,&nbsp;Boxin Wei ,&nbsp;Liping Lei ,&nbsp;Gang Fang ,&nbsp;Robert O. Ritchie ,&nbsp;Upadrasta Ramamurty","doi":"10.1016/j.ijplas.2025.104483","DOIUrl":"10.1016/j.ijplas.2025.104483","url":null,"abstract":"<div><div>Functional fatigue in NiTi-based shape-memory alloys (SMAs), a critical barrier to their widespread adoption for a variety of technologies, remains a key challenge with incomplete mechanistic understanding. Here we investigate functional fatigue and its restoration in superelastic NiTi SMAs with wide-ranging grain sizes and subjected to elastocaloric cycling under varying maximum applied stresses (<em>σ</em>_max). Results show that larger grain sizes and/or higher <em>σ</em>_max significantly exacerbate the kinematic irreversibility caused by the fatigue-induced increased dislocation density and martensite retention. It is demonstrated that functional restoration can be achieved through a simple overheating treatment (‘healing’) after cycling, which reverts the retained martensite into austenite for subsequent transformation while preserving dislocations. Retained martensite alone lowers the critical forward transformation stress during cycling, but its effect is fully reversible by healing, irrespective of grain size and <em>σ</em>_max. Both dislocations and retained martensite impair the cyclic transformation capacity of the material, leading to elastocaloric degradation. The contribution of retained martensite, which can be revoked by healing for elastocaloric restoration, increases with <em>σ</em>_max and eventually outweighs the influence of dislocations; refinement in the grain size accelerates this transition. The work provides quantitative insights into the micro-mechanisms underlying functional fatigue and restoration in NiTi SMAs, advancing the development of sustainable elastocaloric technologies.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104483"},"PeriodicalIF":12.8,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145084028","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 microstructurally-sensitive damage model considering grain boundary effect under fatigue and creep-fatigue interaction","authors":"Kai Song ,&nbsp;Lianyong Xu ,&nbsp;Lei Zhao ,&nbsp;Yongdian Han ,&nbsp;Bo Xiao ,&nbsp;Ninshu Ma","doi":"10.1016/j.ijplas.2025.104484","DOIUrl":"10.1016/j.ijplas.2025.104484","url":null,"abstract":"<div><div>A microstructurally-sensitive damage model was developed to predict fatigue/creep-fatigue crack behaviors and rupture lives. The microstructurally-sensitive damage model consisted of a modified creep void model, a modified fatigue slip band model, and a creep-fatigue interaction model. In the modified creep void model, the nucleation and coalescence of creep voids were controlled by the grain boundary angle and stress-strain condition. The modified full-scale fatigue slip band model considered the contribution of creep damage on multiple grain boundaries. Furthermore, a novel parameter was introduced to unify the effects of plastic strain and temperatures of different materials on the crack propagation. Creep-fatigue interaction was considered through creep void and fatigue crack. The simulated crack behavior matched well with the experimental data, and the predicted rupture lives fell within the ±1.7 error band. The results exhibited that it was an efficient tool for predicting crack behavior under complex fatigue and creep-fatigue loading conditions.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104484"},"PeriodicalIF":12.8,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145083955","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":"Heterogeneous microstructures by combining laser additive manufacturing with auxiliary ultrasound field for strength-ductility betterment","authors":"Na Li ,&nbsp;Xianqi Lei ,&nbsp;Yuqiong Li ,&nbsp;Yujie Wei","doi":"10.1016/j.ijplas.2025.104481","DOIUrl":"10.1016/j.ijplas.2025.104481","url":null,"abstract":"<div><div>Heterogenization is broadly employed to metallic alloys to improve their strength and ductility. In the current work, taking advantage of layer-wise melting by laser additive manufacturing (LAM) and grain refinement by auxiliary ultrasound field (USF), we combine LAM with USF to realize heterogeneous structures in 316 L stainless steel (SS). The as-built heterogeneous 316 L SS exhibits hierarchical microstructures spanning multiple length scales, ranging from millimeter-sized grains and micrometer-scale intragranular cellular domains down to nanoparticles of Fe-Cr σ-phase and L1₂ precipitates heterogeneously dispersed within the cellular matrix. This unique spatial distribution of microstructures with a broad size-span and chemical fluctuations give rise to an ultra-high tensile strength in heterogeneous 316 L SS with a ultimate strength up to 1 GPa and an elongation of ∼12.5 %. We further reveal that the synergy effect from hierarchical twins and metastable cells on dislocation gliding gives rise to the superior strength-ductility performance. The demonstration of using LAM with auxiliary USF to achieve controllable hierarchical heterogeneous microstructure paves a practical way for microstructure design and manufacturing.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104481"},"PeriodicalIF":12.8,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145068095","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 crystal plasticity-informed data-driven model for magnesium alloys","authors":"Ding Tang ,&nbsp;Shikun Qi ,&nbsp;Kecheng Zhou ,&nbsp;May Haggag ,&nbsp;Xiaochuan Sun ,&nbsp;Dayong Li ,&nbsp;Huamiao Wang ,&nbsp;Peidong Wu","doi":"10.1016/j.ijplas.2025.104480","DOIUrl":"10.1016/j.ijplas.2025.104480","url":null,"abstract":"<div><div>In the past few years, data-driven models based on artificial neural network (ANN) have been successfully developed and applied to investigate the macro- and micro-mechanical behaviors of various materials. However, these data-driven models are either too complex in structure or lack interpretable physical insights. In the present work, a crystal plasticity-informed data-driven (CPIDD) model is proposed, which updates the microstructural information and parameters associated with the macroscopic constitutive model using a parallel ANN structure, and combines conventional constitutive equations to obtain the stress-strain response, ensuring efficient and stable calculations. In conjunction with the finite element (FE) method, the FE-CPIDD model simulates the micro- and macro-mechanical behaviors of magnesium (Mg) alloys under uniaxial loading, non-proportional loading, four-point bending and unloading. The comparison between the simulations and available experiments (or crystal plasticity simulations) demonstrates the accuracy and effectiveness of the proposed CPIDD model. Using Mg alloys as a representative case, the CPIDD model provides an operational and extensional tool for the design, fabrication, manufacturing, and service of the metallic components.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104480"},"PeriodicalIF":12.8,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043055","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":"Experimental analysis and modeling of anisotropic ductile damage in non-proportional extreme low-cycle biaxial loading with shear-tension histories","authors":"Zhichao Wei ,&nbsp;Guoxi Mao ,&nbsp;Steffen Gerke ,&nbsp;Sebastian Münstermann ,&nbsp;Michael Brünig","doi":"10.1016/j.ijplas.2025.104474","DOIUrl":"10.1016/j.ijplas.2025.104474","url":null,"abstract":"<div><div>This paper discusses the ductile damage and fracture behavior based on newly designed and performed non-proportional, non-reverse, extremely low-cycle experiments. In contrast to most extremely low-cycle experiments, which involve reverse loading histories or are restricted to a limited small plastic strain range, this study proposes novel non-proportional tension-to-shear (TS) and shear-to-tension (ST) loading patterns. Different combinations of displacement increments are applied within individual cyclic loading patterns, ensuring that specimen failure is governed by ductile damage and fracture under large plastic deformations. Numerical calculations are based on an advanced cyclic plastic-damage constitutive model with combined hardening laws. A novel non-proportionality parameter incorporating the effective back stress tensor is introduced into the combined hardening formulation to account for non-proportional hardening, allowing for a more accurate characterization of plastic behavior under non-proportional cyclic loading conditions. Digital image correlation (DIC) is used to analyze the global load–displacement curves and local strain fields, enabling comparison with the numerical results at both macroscopic and microscopic levels. Scanning electron microscope (SEM) and light optical microscope (LOM) images were taken from the fracture surfaces as well as both fractured and unfractured notch areas of the specimen, respectively. A novel quantitative analysis was introduced to evaluate the obtained SEM images using a convolutional neural network (CNN) approach, whereas LOM images were analyzed with the open-source software ImageJ. The present work highlights that non-proportional loading histories and shear-tension cyclic loading sequences with various plastic amplitudes significantly influence on the material’s plastic and ductile damage behavior.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104474"},"PeriodicalIF":12.8,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043054","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":"Abnormal stress rebound after dynamic void coalescence in metallic glasses","authors":"Jing He ,&nbsp;Guoji Yu ,&nbsp;Zongheng Li ,&nbsp;Yunlong Guan ,&nbsp;Yunjiang Wang","doi":"10.1016/j.ijplas.2025.104478","DOIUrl":"10.1016/j.ijplas.2025.104478","url":null,"abstract":"<div><div>Understanding the microscopic mechanism of void coalescence is essential for evaluating the accumulation of dynamic damage in structural materials. However, experimental characterization of such a transient process remains extremely challenging. Here, the spatial arrangement of pre-existing voids and the influence of strain rate on dynamic void coalescence in a prototypical metallic glass (MG) are systematically investigated by molecular dynamics under conditions of uniaxial (1D) and triaxial (3D) tensile loading. It is found that, under 1D loading, the void arrangement affects only the stress-strain response, without impacting the growth and coalescence rate of the voids. However, under 3D dynamic loading, temperature around the voids undergoes a significant decrease after void coalescence. From the perspective of atomic packing, the number of mechanically stable &lt;0,0,12,0&gt; atomic Voronoi polyhedra recovers as strain rate goes up. As a result, material experiences abnormal stress rebound after void coalescence due to the unexpected microstructural hardening effect, which is absent in crystalline metals. Meanwhile, the stress rebound strength can be controlled by adjusting void characteristics or material parameters. This unusual stress rebound might find applications for metallic materials under extreme conditions.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104478"},"PeriodicalIF":12.8,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043062","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":"Mechanistic insights into stress localization and crack precursors during dwell fatigue: Dislocation evolution from basal slip in near-α titanium alloys","authors":"Runchen Jia ,&nbsp;Weidong Zeng ,&nbsp;Heng Li ,&nbsp;Zibo Zhao ,&nbsp;Yujing Liu ,&nbsp;Meng Qi ,&nbsp;Boning Wang ,&nbsp;Jiaxi Zhu ,&nbsp;Jianwei Xu ,&nbsp;Qingjiang Wang","doi":"10.1016/j.ijplas.2025.104477","DOIUrl":"10.1016/j.ijplas.2025.104477","url":null,"abstract":"<div><div>Basal slips govern the onset of dwell-fatigue damage in near-α titanium alloys, yet the mechanisms by which they rapidly evolve into crack nucleation under dwell loading remain insufficiently understood. To address this gap, we apply a multiscale framework combining in-situ dwell-fatigue testing, high-resolution dislocation microscopy, and atomistic simulations to directly uncover how basal dislocation structures develop into crack precursors. Notably, for the first time under dwell-fatigue conditions, we demonstrate that the concurrent activation of multiple basal 〈<em>a〉</em> slips on a single plane induces marked intragranular lattice rotations and strain localization, thereby accelerating damage accumulation. Conversely, co-activation of prismatic and pyramidal slip systems fragments these bands, redistributes strain, and markedly improves dwell-fatigue resistance. Furthermore, a critical slip-transfer mechanism is clarified, wherein basal dislocation transmission across grain boundaries is strongly governed by misorientation: low-angle boundaries permit near-continuous transmission, promoting dislocation pile-ups and local stress amplification, while high-angle boundaries impede slip and facilitate 〈<em>c</em> + <em>a〉</em> dislocation nucleation via interfacial shear to restore compatibility. Moreover, molecular dynamics simulations validate the broader and higher-amplitude strain fields of basal bands under dwell loading and further uncover a previously unrecognized stress-assisted edge-to-screw dislocation transformation that sustains localized shear, intensifies strain gradients, and predisposes the slip band to premature crack initiation. Collectively, these findings establish a unified failure pathway for basal slip–induced damage, offering new mechanistic insights into how slip-band evolution and dislocation interactions give rise to crack precursors, and informing alloy-design strategies to mitigate dwell fatigue in near-α titanium alloys.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104477"},"PeriodicalIF":12.8,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043234","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":"Using mechanical equilibrium to correct HR-EBSD stress measurements","authors":"Eralp Demir, Anna Kareer, Chris Hardie, Edmund Tarleton","doi":"10.1016/j.ijplas.2025.104464","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104464","url":null,"abstract":"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. The method provides a calculation of stress for each of the reference points instead of assuming the reference point stresses are zero, capturing the grain-to-grain variation 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, and 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 applied to synthetically generated relative stress data for a uniform bending case, and the method successfully predicts the stress distributions.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"29 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-09-09","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}

{"title":"Ultra-low temperature mechanical response of VCoNi medium-entropy alloy with unprecedented high strength and ductility","authors":"Tae Jin Jang ,&nbsp;Min Young Sung ,&nbsp;Gunjick Lee ,&nbsp;Hahun Lee ,&nbsp;Jun Ho Lee ,&nbsp;Alireza Zargaran ,&nbsp;Young-Kyun Kim ,&nbsp;Zhiming Li ,&nbsp;Young-Sang Na ,&nbsp;Seok Su Sohn","doi":"10.1016/j.ijplas.2025.104473","DOIUrl":"10.1016/j.ijplas.2025.104473","url":null,"abstract":"<div><div>This work reports on the unprecedented high tensile strength and ductility of single-phase VCoNi medium-entropy alloys (MEAs) at liquid helium temperature (4.2 K) and reveals the effects of grain size on strength, strain-hardening capability, and discontinuous plastic flow (DPF) behavior at 4.2 K. The fine-grained VCoNi MEA with an average grain size of 2.2 μm exhibits exceptional yield strength of 1386 MPa and tensile stress of 1845 MPa at a high elongation of 43%. The Hall–Petch (H–P) relationship at 4.2 K for the VCoNi MEA was established for the first time, demonstrating that the yield strength enhancement with decreasing temperature primarily originates from a reduction in dislocation width, leading to an exceptionally high solid-solution strengthening contribution of 782 MPa. In addition to planar slip, nano-twinning and stacking faulting were activated at 4.2 K upon plastic deformation, contributing to a sustained strain-hardening capability. The restricted mobility of screw dislocations at 4.2 K suppresses dynamic recovery, facilitating dislocation proliferation and further enhancing strain hardening. In terms of DPF behavior, characterized by abrupt serrations in the stress-strain curves, fine-grained specimens exhibit more pronounced DPF due to the rapid accumulation of geometrically necessary dislocations. However, the maximum stress drop prior to plastic instability remains similar across all grain sizes, suggesting that dislocation density is the primary factor governing DPF behavior. These findings provide important insights into the development and mechanistic understanding of ultrastrong and ductile alloys for applications at extremely low temperatures.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104473"},"PeriodicalIF":12.8,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145009440","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}