International Journal of Plasticity最新文献

{"title":"Investigation of twin-dislocation interactions using a novel discrete dislocation plasticity framework","authors":"Hai Xin ,&nbsp;Zebang Zheng ,&nbsp;Mei Zhan ,&nbsp;Yudong Lei ,&nbsp;Pandi Zhao ,&nbsp;Yuyang Wang ,&nbsp;Fei Ma ,&nbsp;Gaihuan Yuan ,&nbsp;M.W. Fu","doi":"10.1016/j.ijplas.2025.104465","DOIUrl":"10.1016/j.ijplas.2025.104465","url":null,"abstract":"<div><div>Twinning-induced strain localization fundamentally governs a material’s ductility and failure mechanisms, complementing the role of dislocation slip in hexagonal close-packed crystals. This localization not only accommodates externally applied deformation through stress redistribution but also generates heterogeneous stress that significantly influences nearby dislocation evolution. In conventional dislocation-scale modeling approaches, such as discrete dislocation plasticity (DDP), twinning is typically represented by introducing twin boundaries and regions with reoriented crystal lattices. These models, however, often neglect the associated strain fields generated during the twinning process, resulting in an incomplete description of twinning-dislocation interactions. To address this limitation, a novel DDP model incorporating twin-induced heterogeneous deformation was developed. The model explicitly includes different stages of twinning, such as nucleation, propagation, and growth, and implements the twin-induced stress field using the classical Eshelby inclusion solution. A new superposition framework was further constructed to capture these stress contributions within the DDP formulation accurately. Based on this model, the experimentally observed characteristic twin-induced dislocation arrays in single crystals and bicrystal were successfully reproduced. Moreover, through comparison with the twin-free model, twin-dislocation interactions in polycrystals were quantitatively analyzed, demonstrating the capability of the model to resolve complex plasticity mechanisms across different microstructures.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104465"},"PeriodicalIF":12.8,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145009442","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":"Novel approach to achieve gigapascal level yield strength and large uniform elongation in metastable β-Ti alloys","authors":"Xiu-Qun Wang ,&nbsp;Yan Chong ,&nbsp;Masatoshi Mitsuhara ,&nbsp;Nobuhiro Tsuji","doi":"10.1016/j.ijplas.2025.104466","DOIUrl":"10.1016/j.ijplas.2025.104466","url":null,"abstract":"<div><div>Metastable β titanium alloys exhibit an excellent strain hardening ability and a large uniform elongation, but their widespread use is challenged by a relatively low yield strength. The low yield strength of metastable β titanium alloys is partly due to an early initiation of strain-induced β-to-α″ phase transformation. Here, we propose a novel and cost-effective approach to solve this problem in a model Ti-10 wt.% Mo alloy by refining the grain size and adding oxygen solute. An unprecedented high yield strength of 1040 MPa and a large uniform elongation of 20 % are realized in a fine-grained (average grain size: 5 µm) Ti-10 wt.% Mo-0.5 wt.% O alloy. The superior strength-ductility balance is attributed to a ‘<em>delayed and partially suppressed</em>’ β-to-α″ phase transformation, due to the combined effects of fine grain size and oxygen solute. The <em>delayed</em> β-to-α″ phase transformation (until a plastic strain of 2.1 %) endows dislocation slips as the main factor determining the yield strength, thus enabling a full harness of grain boundary strengthening and oxygen solute hardening. Moreover, {332} twinning activated at the early stage and strain-induced α″ martensite initiated at the later stage of deformation provide continuous strain-hardening capabilities up to a relatively larger strain. Finally, the formation of relatively soft α″ martensite helps to relax the stress localization at slip bands, delaying the formation of microcracks, compared to the coarse-grained counterparts. The novel approach in the present study provides a general strategy to manage both high yield strength and large uniform elongation in metastable β titanium alloys, via tailoring both structural (grain size) and compositional (oxygen content) parameters of the material.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104466"},"PeriodicalIF":12.8,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145003499","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":"Revisiting tension-compression asymmetry in a Mg alloy: insights from statistical strain partitioning and intra-/inter-granular mechanisms at the nanoscale","authors":"Ran Ni ,&nbsp;Carl J. Boehlert ,&nbsp;Xianhua Zheng ,&nbsp;Yaming Ran ,&nbsp;Saijun Huang ,&nbsp;Ying Zeng ,&nbsp;Jiang Zheng ,&nbsp;Qudong Wang ,&nbsp;Hao Zhou ,&nbsp;Dongdi Yin","doi":"10.1016/j.ijplas.2025.104463","DOIUrl":"10.1016/j.ijplas.2025.104463","url":null,"abstract":"<div><div>Tension-compression asymmetry (TCA) is a fundamental mechanical characteristic in Mg alloys. However, its underlying integrated intra- and inter-granular deformation modes and the corresponding nanoscale strain partitioning remain unclear. In this work, the nanoscale strain partitioning together with the activity of both the individual slip modes and apparent grain boundary sliding/shear (GBS), in terms of tangential displacement along the grain boundaries (GBs), were quantitatively and statistically investigated based on approximately 200 grains analyzed for an aged, twin-free Mg-10Y sheet during tension and compression. This was accomplished using multimodal analysis of high-resolution digital image correlation (HRDIC) and electron backscattered diffraction (EBSD) data. The results revealed that strain partitioning exhibited pronounced TCA, where the mean and maximum effective shear strain (ε_eff) values of both slip bands (SBs) and the grain mantle (GM, the region near grain boundary) for tension were larger than that for compression, implying more intensive strain localization in tension. TCA was also evident from analysis of the relative slip activity for the various slip modes, where pyramidal 〈<em>c</em> + <em>a</em>〉 slip was barely activated during tension, but it exhibited a relatively high activity during compression. The GBS activity, which was quantified in terms of both the apparent GBS displacement and the participation rate, was higher for tension compared with compression. This work, which provided experimental and quantitative evaluation of asymmetric strain partitioning and GBS for the first time, adds valuable information useful for a more complete understanding of TCA in polycrystalline Mg alloys.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104463"},"PeriodicalIF":12.8,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144928116","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":"Slip heterogeneity in a colony-structured titanium alloy: Planar versus wavy slip traces","authors":"Zhiying Liu ,&nbsp;Ganlin Chen ,&nbsp;Soumya S. Dash ,&nbsp;Yinghao Zhou ,&nbsp;Changjun Cheng ,&nbsp;Mingqiang Li ,&nbsp;Jiahui Zhang ,&nbsp;Huicong Chen ,&nbsp;Weibing Wang ,&nbsp;Weicheng Xiao ,&nbsp;Daolun Chen ,&nbsp;Ji-Jung Kai ,&nbsp;Liang Qi ,&nbsp;Yu Zou","doi":"10.1016/j.ijplas.2025.104462","DOIUrl":"10.1016/j.ijplas.2025.104462","url":null,"abstract":"<div><div>Titanium (Ti) alloys with colony microstructures, including many near-α and α + β Ti alloys, are widely used in aerospace components. Although the characteristics of the colony microstructures have been extensively studied, the localized deformation behavior of individual colonies has been less reported. This study investigates the slip behavior of α colonies in a near-α Ti-6.5Al-2Mo-Zr-V alloy through surface slip trace analysis, revealing two distinct deformation modes: (i) homogeneous slips, characterized by dense, uniform, and straight planar slip lines; and (ii) heterogeneous slips, featuring wavy and planar slip traces with varying intensities. The wavy slip traces result from &lt;a&gt;-type screw dislocation cross-slips between basal, prismatic, and pyramidal planes, wherein the screw dislocations are primarily emitted from the stressed α/β interfaces at the colony boundaries. These stress concentrations at α/β interfaces arise from the mismatch of elastic modulus (Δ<em>E</em> &gt; ∼5 GPa) and low geometrical compatibility (<em>m</em>' &lt; ∼0.5) between adjacent colonies. All the planar slip traces are aligned with basal or prismatic planes, but the slip intensity - reflecting a degree of slip localization - varies significantly, and an easy slip transfer across an α/β interface promotes slip delocalization. Pyramidal-I &lt;c+a&gt;-type dislocations are also observed and enhance the slip heterogeneity. These findings provide critical insights into deformation heterogeneity in colony-structured titanium alloys, inspiring new pathways for microstructural design to enhance their mechanical performance for a wide range of applications.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104462"},"PeriodicalIF":12.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924335","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":"Composition-deformation mechanism-property machine learning model for strength-ductility improvement of β-type titanium alloys","authors":"Junyun Pan ,&nbsp;Renhai Shi ,&nbsp;Zhihao Zhang ,&nbsp;Hongtao Zhang ,&nbsp;Yuhong Zhao ,&nbsp;Weidong Li ,&nbsp;Huadong Fu ,&nbsp;Jianxin Xie","doi":"10.1016/j.ijplas.2025.104461","DOIUrl":"10.1016/j.ijplas.2025.104461","url":null,"abstract":"<div><div>Maximizing solid-solution hardening while incorporating deformation twinning is crucial for simultaneously enhancing their strength and ductility of β-type titanium alloys. This study proposes an integrated composition design framework (ICDF) that combines a deformation mechanism machine learning model with a yield strength machine learning model. This framework enables precise control of strengthening and deformation mechanism, effectively addressing the strength-ductility trade-off challenge of β-type titanium alloys. First, using the key alloy factor screening method, the key alloy factor-deformation mechanism prediction model and key alloy factor-yield strength prediction model were developed. Then, five kinds of new β-type titanium alloys with excellent comprehensive properties were designed by combining the two models. The new alloy Ti-5Cr-3Mo-1.5Fe exhibited a tensile strength of 1030 MPa, a yield strength of 920 MPa, and an elongation of 28 %. Compared with the commonly used commercial β-type titanium alloy Ti-5Al-5Mo-5V-3Cr (AMS 4983), the strength-ductility product of the new alloy increased by 71.7 %, while the total alloying element content decreased by 47.2 %. The new alloy exhibits intriguing deformation twinning behaviors, including stress-induced {332} 〈113〉 multi-level twinning and {332} 〈113〉 cross-twinning, which, in conjunction with the high solid-solution hardening, results in simultaneous enhancement of strength and ductility. This work provides a novel approach for the rapid design of high performance and low alloying titanium alloys through constructing multi-task models between alloy composition, deformation mechanism and resultant properties.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"194 ","pages":"Article 104461"},"PeriodicalIF":12.8,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144920782","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 deformability through interface and structure tailoring in immiscible metal matrix composites: a case study of W–Cu","authors":"Peng-Cheng Cai,&nbsp;Guo-Hua Zhang,&nbsp;Kuo-Chih Chou","doi":"10.1016/j.ijplas.2025.104460","DOIUrl":"10.1016/j.ijplas.2025.104460","url":null,"abstract":"<div><div>The W–Cu composite, a representative of immiscible metal matrix composites (MMCs), plays a crucial role in fields requiring both mechanical and physical properties. However, the weak interfacial bonding capability between the immiscible phases lead to poor mechanical response. In present work, a considerable interpenetrating diffusion layer and an atomic bonding interface (termed as the 3D interface) with a considerable thickness of ∼10 nm was constructed through the introduction of negative mixing enthalpy elements. Additionally, a partially recrystallized (PRX) heterogeneous matrix was built through precise thermomechanical processing (TMP) treatment. The presence of the 3D interface and PRX structure created additional space for dislocation storage, leading to a high level of heterogeneous deformation-induced (HDI) stress. On one hand, intensified activation stress was triggered for twinning in the face-centered cubic (FCC) matrix, promoting twin-mediated dynamic recrystallization (TDRX) during tensile deformation and effectively alleviating stress concentration. On the other hand, the resulting long-range internal stress not only induced large-scale abnormal twinning and phase transformation at the interface, enhancing work-hardening capacity, but also significantly improved load transfer across the W/Cu interface. In addition, the abundant sub-grain structures and free dislocations induced by rolling deformation promote the plasticization of W particles. Consequently, the composite subjected solely to straightforward infiltration and TMP (including hot rolling, warm rolling, and cold rolling) achieved a remarkable enhancement in both strength and ductility, with the cold-rolled sample exhibiting an ultrahigh tensile strength-ductility combination (1290 MPa, 8.5 %), representing a 2–3 times enhancement over conventional W–Cu composites. This work elucidates nanoscale interface–dislocation interactions in MMCs, shedding new light on the development of structure-function-integrated materials.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"193 ","pages":"Article 104460"},"PeriodicalIF":12.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144919180","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":"Prismatic dislocation loop and helical dislocation generation from ellipsoidal inclusion in inhomogeneous materials: A comprehensive discrete dislocation dynamics simulation","authors":"Lei Liu ,&nbsp;Shangnan Mo ,&nbsp;Chenxi Zhu ,&nbsp;Xueru Zheng ,&nbsp;Ning Gao ,&nbsp;Zhiyan Zhong ,&nbsp;Fengxian Liu ,&nbsp;Yi Hu ,&nbsp;Haiyang Yu ,&nbsp;Xiao Zhou","doi":"10.1016/j.ijplas.2025.104459","DOIUrl":"10.1016/j.ijplas.2025.104459","url":null,"abstract":"<div><div>Thermal mismatch in inhomogeneous materials can be alleviated by the formation of prismatic dislocation loops (PDLs). While previous studies focused on PDL generation from spherical inclusions, mechanisms for PDL generation from non-spherical inclusions remain unclear. To address this gap, this work employs discrete dislocation dynamics (DDD) simulations to systematically investigate PDL generation from ellipsoidal inclusions. Our results demonstrate PDL can be generated from the ellipsoidal inclusions with varying aspect ratios and orientations, even from non-rotationally symmetric regions. PDL generation from the fiber side and continuous generation from the fiber tip match experimental observations well. We have refined the mechanism of helical dislocation formation that larger inclusion size weakens the attraction between opposite screw dislocations, and higher misfit strain increases the difference in resolved Peach-Koehler force on relevant slip planes due to inclusion, both of which suppress pinch-off process. We identify the acceleration mechanism for atom transfer that when demands for atom transfer rise due to larger ideal PDL size or higher misfit strain, helical dislocations tend to form, accelerating atom transfer. These findings align well with experiments and simulations in the literature. This study advances the understanding of dislocation behavior and stress state near non-spherical inclusions, offering guidance for designing inhomogeneous materials with superior mechanical properties.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"193 ","pages":"Article 104459"},"PeriodicalIF":12.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144915785","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":"Superior elevated-temperature strength-ductility synergy in an additive-manufactured Mg-Gd-Y alloy: Dynamic precipitation evolution and deformation behavior under thermal-mechanical coupling","authors":"Junmin Zhan ,&nbsp;Xin Tong ,&nbsp;Guohua Wu ,&nbsp;Wenbing Zou ,&nbsp;Qi Li ,&nbsp;Youjie Guo ,&nbsp;Jiaxin Yu ,&nbsp;Fangzhou Qi ,&nbsp;Liang Zhang ,&nbsp;Zhanyong Zhao ,&nbsp;Peikang Bai","doi":"10.1016/j.ijplas.2025.104458","DOIUrl":"10.1016/j.ijplas.2025.104458","url":null,"abstract":"<div><div>Significant strength loss at elevated temperatures has always been one of the great challenges for the extended application of magnesium (Mg) alloys. This work reports an exceptional increase in the elevated-temperature mechanical properties of magnesium rare-earth (Mg-RE) alloys fabricated by direct energy deposition using electric arc (DED-Arc). The tensile strength at 250 °C of the DED-Arc Mg-9Gd-3Y-0.5Zr (GW93K) alloy is almost 70 MPa higher than that of the cast counterpart, accompanied by desirable ductility. A quasi-<em>in situ</em> approach was employed to investigate the dynamic precipitation evolution of both DED-Arc and cast alloys under simple thermal effect and thermal-mechanical coupling for a comparative study. Molecular dynamics (MD) simulations were utilized to analyze RE diffusion in DED-Arc alloys. Compared to cast alloys, DED-Arc alloys exhibit nano-scale precipitates with significantly higher number density under thermal-mechanical coupling during tensile test. The residual dislocations from the DED-Arc process and uniformly distributed dislocations formed during tensile deformation impeded RE solute diffusion toward grain boundaries (GBs), thereby reducing grain boundary precipitation (GBP). The inhibited GBP and absence of precipitation-free zones (PFZs) reduce stress concentration at GBs, delaying crack initiation. The effects of microstructural features including grain size, texture, and precipitates on deformation modes were systematically compared. Consequently, DED-Arc Mg-RE alloys demonstrate superior strength-ductility synergy: ultimate tensile strength: 291.9 ± 7.3 MPa and elongation: 19.2 ± 1.0 % at 250 °C. This research could provide new insights into the application of Mg alloys in extreme conditions such as elevated temperatures.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"193 ","pages":"Article 104458"},"PeriodicalIF":12.8,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144899974","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 hardening of aluminum alloy sheets under biaxial proportional loading","authors":"Kengo Yoshida","doi":"10.1016/j.ijplas.2025.104457","DOIUrl":"10.1016/j.ijplas.2025.104457","url":null,"abstract":"<div><div>Anisotropic hardening, where work-hardening behavior varies with loading direction and deformation mode, has been widely observed in sheet metals, even under proportional loading. However, existing models typically describe anisotropic hardening through yield surface distortion, which raises concerns about convexity of yield surface and physical validity. The anisotropic hardening behavior of aluminum alloy sheets under proportional loading was investigated. Crystal plasticity simulations showed that as plastic deformation progressed, the plastic work contour gradually flattened and eventually concave near the plane-strain tension state, while the subsequent yield surface remained convex. Based on these observations, a novel anisotropic hardening model was developed. In this model, the yield surface expands without changing its shape, and the hardening rate is governed by both the stress state and equivalent plastic strain. Convexity of the yield surface is preserved if the initial yield surface is convex. Coefficients in the stress-state-dependent hardening rate are analytically derived from stress–strain curves. The proposed model accurately captures the anisotropic stress–strain response under proportional loading and reproduces the distortion and concavity of the plastic work contour. Implemented in a finite element framework, the model was used to simulate the hydraulic bulge test of an AA6016-T4 sheet. The simulation provided improved predictions of internal pressure and strain distribution compared to conventional isotropic hardening model. Finally, the feasibility of extending the model to account for asymmetric hardening, Bauschinger effect, and cross-loading effect are also examined. The proposed model demonstrates strong potential for improving the accuracy of sheet metal forming simulations by capturing anisotropic hardening effects.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"193 ","pages":"Article 104457"},"PeriodicalIF":12.8,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144901781","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":"Simultaneously enhancing strength and ductility of laser directed energy deposited TiB2/AlSi10Mg by inducing dispersed Mg2Si precipitation and reducing strain concentration","authors":"An Wang ,&nbsp;Qianglong Wei ,&nbsp;Zijue Tang ,&nbsp;Pengyuan Ren ,&nbsp;Xiaolin Zhang ,&nbsp;Yi Wu ,&nbsp;Hongbing Zhu ,&nbsp;Quan Li ,&nbsp;Yongbing Li ,&nbsp;Haowei Wang ,&nbsp;Hongze Wang","doi":"10.1016/j.ijplas.2025.104455","DOIUrl":"10.1016/j.ijplas.2025.104455","url":null,"abstract":"<div><div>Laser directed energy deposition (L-DED) has been widely used in metal additive manufacturing due to its advantages in terms of large dimensions and high forming speed. However, the limited mechanical properties and ductility of components have hindered the broader application of this technology. In this research, we have achieved a simultaneous enhancement of yield strength and elongation in TiB₂/AlSi10Mg composites after T6 heat treatment fabricated by blue l-DED technology. The T6 heat-treated TiB₂/AlSi10Mg composites exhibit a yield strength, tensile strength, and elongation of approximately 289.4 MPa, 431.3 MPa, and 12.3 %, respectively, representing exceptionally high values. An in-situ imaging technique utilizing X-ray computed tomography (CT) is firstly implemented to explore the evolution of defects, TiB₂ particles, and microcracks during the deformation process. In the process of plastic deformation, new voids nucleate at the interface between the Al matrix and TiB₂ particles with a large size (&gt;25 μm), leading to damage accumulation. Furthermore, based on the modified Gurson-Tvergaard model, a new critical strain value of TiB₂ particles (∼8 %) for void nucleation is proposed. After T6 heat treatment, no significant grain coarsening occurs due to the “pinning” effect of TiB₂ particles on the grain boundaries. Lots of fine dispersed Mg₂Si phases (quantity density about 3.1 × 10¹⁵ m^-2) show more obvious precipitation strengthening. This research provides valuable insights to further promote the development of high-performance aluminum matrix composites by the l-DED process.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"193 ","pages":"Article 104455"},"PeriodicalIF":12.8,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144899771","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}