International Journal of Plasticity最新文献

{"title":"Strain rate-driven transition between dislocation slip and twinning in Ti-6Al-4V ELI alloy during tensile deformation","authors":"Mingjie Zhang ,&nbsp;Hui Guo ,&nbsp;Jianke Qiu ,&nbsp;Xiaobing Hu ,&nbsp;Chao Fang ,&nbsp;Hao Wang ,&nbsp;Dongsheng Xu ,&nbsp;Yingjie Ma ,&nbsp;Jiafeng Lei ,&nbsp;Rui Yang","doi":"10.1016/j.ijplas.2025.104599","DOIUrl":"10.1016/j.ijplas.2025.104599","url":null,"abstract":"<div><div>In this work, the strain rate effects on the Ti-6Al-4V ELI alloy under uniaxial tensile loading were systematically investigated over a wide range of strain rates, from quasi-static to dynamic conditions with nominal strain rates ranging from 0.001 to 1000 s^-1. Electron backscatter diffraction technique was used to characterize the evolutions of the mean geometrically necessary dislocation (GND) density and twin boundary fraction with increasing strain rate, while transmission electron microscopy was used to examine changes in dislocation structures. The results reveal the presence of a critical strain rate near 50 s^-1, which divides the strain rate strengthening behavior into two distinct regimes, each characterized by markedly different strain rate sensitivity (SRS) exponents (<span><math><mi>m</mi></math></span>). The contrasting trends in <span><math><mi>m</mi></math></span> value, GND density and twin content indicate a strain rate-induced transition in dominant deformation mechanism—from slip-dominated behavior at lower strain rates to slip-twinning dominated behavior at higher strain rates, which arises from the competitive interplay between dislocation slip and deformation twinning. Additionally, the SRSs of various slip systems and the <span><math><mrow><mrow><mo>{</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn></mrow><mo>}</mo></mrow><mrow><mo>〈</mo><mrow><mover><mn>1</mn><mo>¯</mo></mover><mn>011</mn></mrow><mo>〉</mo></mrow></mrow></math></span> twinning mode were evaluated through a combination of experimental characterizations and molecular dynamics simulations. Among these, prismatic ⟨<em>a</em>⟩ slip exhibits the highest SRS, explaining its reduced activity under dynamic loading conditions, while twinning, with relatively low SRS, exhibits elevated activity.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"197 ","pages":"Article 104599"},"PeriodicalIF":12.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145813011","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":"Hierarchical interfacial L12 shell formation enables stable high-temperature mechanical performance in FCC/B2 dual-phase high-entropy alloys","authors":"Linxiang Liu ,&nbsp;Qingfeng Wu ,&nbsp;Zhijun Wang ,&nbsp;Hyoung Seop Kim ,&nbsp;Junjie Li ,&nbsp;Lei Wang ,&nbsp;Feng He ,&nbsp;Jincheng Wang","doi":"10.1016/j.ijplas.2025.104585","DOIUrl":"10.1016/j.ijplas.2025.104585","url":null,"abstract":"<div><div>L1₂-strengthened FCC/B2 dual-phase high-entropy alloys (HEAs) exhibit excellent mechanical performance across a broad temperature range, positioning them promising candidates for high-temperature structural applications. However, microstructural coarsening and associated mechanical degradation under prolonged thermal exposure remain key challenges. In this study, a representative alloy with the composition Ni_41.9Co₁₉Cr₁₀Fe₁₀Al₁₅Mo₂Ti₂B_0.1 (at. %) was subjected to long-term aging at 800 °C, revealing an unusual microstructural evolution. Beyond the expected L1₂ coarsening within the FCC phase, an interfacial L1₂ shell formed via the progressive consumption of L1₂ precipitates from both the FCC and B2 phases, ultimately encapsulating the B2 domains. This transformation produced a unique three-level hierarchical architecture: FCC matrix with intragranular L1₂ precipitates, an interfacial L1₂ shell, and a B2 core. Remarkably, despite this pronounced microstructural evolution, the alloy maintained stable strength-ductility synergy from room temperature up to 800 °C. This stability is attributed to the additional strengthening imparted by the interfacial L1₂ shell and the favorable cooperative deformation among the FCC, B2, and interfacial L1₂ phases. A quantitative strengthening model was established, revealing that the strengthening contribution of the L1₂ shell increases with increasing shell thickness and exceeds 100 MPa after 720 h of aging. These results provide valuable guidance for the design of thermally stable precipitation-strengthened dual-phase HEAs for long-term high-temperature applications.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"197 ","pages":"Article 104585"},"PeriodicalIF":12.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145777635","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 fracture-resistant design principles in harmonic-structured high-entropy alloys using quasi in situ experiments and integrated modeling","authors":"Ruo-Fei Yuan ,&nbsp;Yong Zhang ,&nbsp;Yu Zhang ,&nbsp;Bo Dong ,&nbsp;Yong-Ji Wang ,&nbsp;Zhe Zhang ,&nbsp;Tang Gu ,&nbsp;Yun-Fei Jia ,&nbsp;Fu-Zhen Xuan","doi":"10.1016/j.ijplas.2025.104600","DOIUrl":"10.1016/j.ijplas.2025.104600","url":null,"abstract":"<div><div>Harmonic-structured (HS) metallic materials have garnered significant interest owing to their exceptional strength–ductility synergy, yet grain-scale fracture mechanisms remain poorly elucidated, impeding the formulation of predictive strategies for strength–toughness balancing. To address this gap, we fabricated HS CoCrFeMnNi high-entropy alloys with tailored fine-grain (FG) shell fractions. Quasi-in situ tensile experiments monitored via electron backscatter diffraction (EBSD) and crystal plasticity finite element/cohesive zone modeling (CPFEM–CZM) reveal that FG regions exhibit high crack susceptibility due to pronounced strain gradients—particularly at coarse-grain (CG)/FG interfaces and within fine-grained zones—that evolve with strain and intensify stress concentration through deformation incompatibility, thereby promoting preferential crack nucleation and propagation. Conversely, CG regions enable sustained plastic energy dissipation via superior intrinsic deformability. Cracks nucleate and propagate preferentially within FG zones, while CG domains dissipate energy via plasticity and microcracking, diverting energy from primary crack growth. As cracks propagate into CG regions, they activate multiple slip systems, generating strain gradients that increase geometrically necessary dislocation density near crack tips. This elevates back stress, inducing crack blunting and enhancing fracture tolerance. Crucially, an optimal FG fraction (31.4%) prevents premature crack nucleation in FG regions while maintaining strength unattainable in low-FG HS variants, thereby preserving material continuity. This dual-phase synergy ensures superior fracture resistance and strength-toughness balance in HS alloys. Our work elucidates intrinsic fracture resistance mechanisms of HS microstructures and quantifies the effects of FG fraction on damage tolerance, establishing essential microstructural design criteria for advanced metallic materials.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"197 ","pages":"Article 104600"},"PeriodicalIF":12.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145844921","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 fatigue response of CoCrNi-based multi-principal element alloy with Mo addition","authors":"Shubham Sisodia ,&nbsp;Akshat Godha ,&nbsp;Chethan Konkati ,&nbsp;Nikhil Suman ,&nbsp;Govind Bajargan ,&nbsp;Surendra Kumar Makenini ,&nbsp;Ankur Chauhan","doi":"10.1016/j.ijplas.2025.104604","DOIUrl":"10.1016/j.ijplas.2025.104604","url":null,"abstract":"<div><div>Single-phase CoCrNi-based multi-principal element alloys (MPEAs) are recognized for their excellent fatigue damage tolerance. To further enhance their performance, a small amount of Mo was introduced into the CoCrNi system, resulting in the Co_35.4Cr_22.9Ni_35.5Mo_6.2 (commercially known as MP35N). This study investigates its tensile and low-cycle fatigue behavior at room temperature. The alloy, with an average grain size of ∼67 µm, exhibits a yield strength of 303 ± 8 MPa, an ultimate tensile strength of 800 ± 7 MPa, and a total-elongation-to-failure of 75 ± 3%. Its pronounced work-hardening and high ductility arise from its low stacking fault energy (SFE), which enables the concurrent activation of planar slip and deformation twinning. Under cyclic loading, the alloy shows pronounced initial cyclic hardening, followed by strain amplitude-dependent responses. Away from fatigue cracks, deformation is governed by planar slip of extended dislocations, whose multiplication and interactions generate sessile stacking-fault nodes and Lomer–Cottrell locks, driving cyclic hardening. At low strain amplitudes (±0.3% and ±0.5%), dislocations remain homogeneously distributed within the grains, with no twinning away from the fatigue cracks. In contrast, at higher strain amplitude (±0.7%), dislocation density increases, accompanied by a growing tendency to rearrange into low-energy structures and localized deformation twinning, as the cyclic peak stresses exceed the critical twinning stress. Surface relief-assisted fatigue cracks predominantly initiate parallel to coherent annealing twin boundaries (ATBs), with fewer occurrences across ATBs, or along/across grain boundaries. This behaviour is governed by slip compatibility and transfer metrics, evaluated through the Taylor factor, elastic stiffness contrast, ATB–loading-axis orientation, Schmid factor, and the Luster–Morris parameter. Near fatigue cracks, high local stresses activate deformation twinning at all strain amplitudes, which is intersected and sheared by shear bands. Twinning contributes to strengthening, while shear bands nucleate within pre-twinned regions, leading to twin bending, necking, detwinning, and the formation of nano-subgrains, which facilitate localized softening. Compared to other CoCrNi-based MPEAs, this Mo-alloyed variant achieves higher peak stresses and comparable or improved fatigue life. These enhancements stem from Mo-induced strengthening and the alloy’s low SFE, which promotes reversible planar slip, suppresses dislocation rearrangement into low-energy structures such as walls, veins, and cells, and amplifies twinning and shear banding near cracks. Collectively, these mechanisms define the overall cyclic stress response, accommodate localised plastic strain, generate tortuous crack paths, and slow crack growth, thereby conferring fatigue resistance that approaches that of dual-phase MPEAs.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"197 ","pages":"Article 104604"},"PeriodicalIF":12.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922260","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 physics-based microscale model for predicting Coble creep deformation: Incorporating stress–diffusion interactions and effects of polycrystalline morphology","authors":"Kota Sagara ,&nbsp;Mitsuhiro Ito ,&nbsp;Takayuki Kitamura ,&nbsp;Kazuki Shibanuma","doi":"10.1016/j.ijplas.2026.104609","DOIUrl":"10.1016/j.ijplas.2026.104609","url":null,"abstract":"<div><div>Accurate evaluation of material creep behaviour is essential for the reliable operation of industrial equipment. In this study, we propose a physics-based model capable of quantitatively predicting the deformation of three-dimensional polycrystalline solids due to Coble creep. The proposed model avoids non-physical assumptions commonly adopted in conventional numerical analyses and reproduces stress-induced grain boundary diffusion—the fundamental mechanism underlying Coble creep—in a physically consistent manner. This is achieved by explicitly representing the three-dimensional grain boundary network and accounting for the interaction between stress and atomic diffusion along grain boundaries. To validate the proposed model, its numerical simulation results were compared with the theoretical equation for Coble creep deformation under uniaxial loading and with the established knowledge under multiaxial loading. The model accurately reproduces the dependence of the macroscopic creep strain rate on grain size, applied stress, and temperature, consistent with the theoretical equation. Furthermore, systematic numerical simulations were conducted to investigate the effects of polycrystalline morphology, such as grain size distribution and aspect ratio, on Coble creep deformation. The results demonstrate that variations in grain size distribution and grain aspect ratio in polycrystalline morphology can lead to measurable changes in the macroscopic creep response, even under identical loading and temperature conditions. The proposed model provides a physically grounded tool for predicting Coble creep deformation of materials under arbitrary loading conditions and polycrystalline morphologies. Moreover, it elucidates the role of microstructural factors in determining material performance, thereby advancing the understanding of GB diffusion-controlled deformation mechanisms at low stresses and over extended timescales.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"197 ","pages":"Article 104609"},"PeriodicalIF":12.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145956519","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":"Strong, ductile, and hierarchical multiscale heterostructured magnesium alloy via coarse-grained twins coupled with fine-grained precipitates","authors":"Shuaishuai Liu ,&nbsp;Liuyong He ,&nbsp;Tianjiao Li ,&nbsp;Liping Zhong ,&nbsp;Mingshuai Huo ,&nbsp;Yongjian Wang ,&nbsp;Wenzhen Xia ,&nbsp;Wenhuan Chen ,&nbsp;Wenbin Zhang ,&nbsp;Qiyang He ,&nbsp;Manoj Gupta ,&nbsp;Guangsheng Huang ,&nbsp;Bin Jiang ,&nbsp;Fusheng Pan","doi":"10.1016/j.ijplas.2026.104608","DOIUrl":"10.1016/j.ijplas.2026.104608","url":null,"abstract":"<div><div>Heterostructured materials provide a promising path to address the strength-ductility trade-off in Mg alloys. However, designs relying solely on grain size heterogeneity often yield limited improvements. Herein, we fabricated multiscale heterostructures in an AZ91 alloy, featuring twin-modified coarse grains and precipitate-hardened fine grains, through a combination of pre-aging, extrusion, and pre-compression treatments. The obtained material exhibits an exceptional strength-ductility combination, outperforming most existing AZ91 alloys. Mechanistic investigations reveal that this favorable combination is primarily driven by enhanced hetero-deformation induced (HDI) strengthening and hardening, which result from the accumulation of geometrically necessary dislocations (GNDs) at multiscale interfaces. Additional contributions arise from twin-matrix interactions that activate non-basal slip systems, as well as a composite strengthening effects induced by precipitates, dislocation cells, and stacking faults. The multiscale heterostructures promote uniform deformation through slip transfer, stress redistribution, and strain delocalization. Strain hardening is initially dominated by HDI effects, while traditional dislocation-mediated mechanisms become predominant at larger strain. The present approach, integrating precipitate engineering, grain size control, and crystallographic design, provides general guidelines for developing advanced lightweight materials.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"197 ","pages":"Article 104608"},"PeriodicalIF":12.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145903361","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":"Potent interplay between L12 nanoprecipitates and 9R phase enabling strength-ductility synergy in a 650 MPa-class additively manufactured aluminum alloy","authors":"Chengzhe Yu ,&nbsp;Xizhen Xia ,&nbsp;Kefu Gan ,&nbsp;Tong Wang ,&nbsp;Peng Dong ,&nbsp;Xiaokang Liang ,&nbsp;Honghui Wu ,&nbsp;Tiechui Yuan ,&nbsp;Ruidi Li","doi":"10.1016/j.ijplas.2025.104595","DOIUrl":"10.1016/j.ijplas.2025.104595","url":null,"abstract":"<div><div>High-strength additively manufactured (AM) Al alloy is critical for advanced lightweight applications, yet conventional strategies relying on large additions of rare-earth (RE) remain costly and sacrifice ductility. Here, we propose an alternative approach for strength-ductility synergy in a laser powder bed fusion-fabricated low-RE Al alloy, via tuning the interplay between L1₂ nano-precipitate and metastable 9R phase. This strategy is simply realized by low-power laser remelting at each building layer, followed by post-print ageing. As evidenced by computational fluid dynamics simulation and microstructural characterization, laser remelting with limited energy input reduces metallurgical defects and residual stress by refining grain microstructures and suppressing turbulent flows during solidification. Simultaneously, it promotes the in-situ formation of 9R domains through driven local Mg/Si segregation and primary L1₂ nanoprecipitates. 9R phases are stabilized when L1₂ nano-precipitates are generated adjacent during post-print ageing, establishing a unique pinning-like stabilization. The 9R domains also impede the growth and coalescence of L1₂-ordered structure. This interplay establishes a feedback mechanism: L1₂ phase inhibits the 9R-phase annihilation, while the 9R structure conversely suppresses L1₂-phase coarsening during aging. According to first-principles calculations: (i) Stacking fault energy is lowered by local Si/Mg segregation, thereby promoting the formation of stacking-faulted 9R phase, even mechanical twins during deformation; (ii) L1₂ nanoparticles thermodynamically stabilize 9R structures by inhibiting the stacking fault annihilation, prolonging their persistence under stress. This coupling mechanism between L1₂ nanoprecipitate and 9R phase enables the present alloy to have an ultrahigh yielding strength over 650 MPa with considerable deformability, predominating most of its previous counterparts.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"197 ","pages":"Article 104595"},"PeriodicalIF":12.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145796130","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":"Cross-slip and easy-glide CRSS in titanium: Theoretical predictions and in-situ TEM measurements","authors":"Tolga Berkay Celebi ,&nbsp;Orcun Koray Celebi ,&nbsp;Daegun You ,&nbsp;Ahmed Sameer Khan Mohammed ,&nbsp;Ashley Bucsek ,&nbsp;Huseyin Sehitoglu","doi":"10.1016/j.ijplas.2025.104605","DOIUrl":"10.1016/j.ijplas.2025.104605","url":null,"abstract":"<div><div>This study investigates the mechanics of prismatic and first-order pyramidal <span><math><mrow><mo>〈</mo><mi>a</mi><mo>〉</mo></mrow></math></span> slip in titanium (Ti), elucidating the physics of easy-glide and cross-slip through a combination of theory and experiments. Screw-character prismatic (Pr) dislocations in Ti are of particular interest because their complex cores can be stable or unstable, leading to activation by either cross-slip or planar glide. To investigate these mechanisms, site-specific micro tensile samples were prepared using focused ion beam (FIB) milling and mounted on a push-to-pull (PTP) device for in-situ transmission electron microscopy (TEM) tensile testing. The in-situ experiments provide direct observations of the onset of dislocation motion and the precise determination of the critical resolved shear stress (CRSS) for the activated mechanisms, and its evolution with load cycling. A comprehensive theory has been developed to predict the CRSS values for easy glide, cross-slip, and multiplication of dislocations. Predicted critical stresses for pyramidal (π)-to-Pr and reverse cross-slip agree closely with the experimental measurements. The latter cross-slip stress is a factor of two higher than that of unobstructed planar slip. The model accounts for overlapping dislocation cores and employs a Wigner-Seitz based cell to evaluate misfit energies. By combining ab initio density functional theory (DFT) with anisotropic elasticity, the framework identifies minimum energy pathways for dislocation glide, which can be intermittent and zig-zag. A simplified expression utilizing (π) and Pr Schmid factor ratios is proposed for critical stress corresponding to (π)-to-Pr cross-slip transition. The results are strongly dependent on crystal orientation, underscoring non-Schmid behavior. Overall, this study explores key critical stress parameters essential for informing higher-scale simulations of plasticity in Ti.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"197 ","pages":"Article 104605"},"PeriodicalIF":12.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894272","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":"An interface-regularized phase field model for deformation twinning","authors":"Linfeng Jiang ,&nbsp;Guisen Liu ,&nbsp;Peipeng Jin ,&nbsp;Yao Shen ,&nbsp;Jian Wang","doi":"10.1016/j.ijplas.2025.104569","DOIUrl":"10.1016/j.ijplas.2025.104569","url":null,"abstract":"<div><div>Deformation twinning, a common deformation mechanism in metals with a hexagonal close-packed (HCP) structure, produces plastic strain accompanied with the creation of twinned domains within the matrix. Phase-field models for deformation twinning often suffer from unphysically diffuse or overly wide interfaces, particularly under large and inhomogeneous driving forces. Maintaining a dynamically stable interface is essential for achieving an accurate description of interface motion. In this work, we propose a Forward-Backward Regularization (FBR) method to control the width of twin interfaces. This is accomplished by introducing an energy penalty term—linked to the gradient magnitude of the order parameter—into the total free energy functional. This method decouples the numerical control of interface width from the physical material parameters (e.g., interfacial energy), thereby preserving their intrinsic physical significance. The FBR method demonstrates robust performance in multiple scenarios, including interfacial energy-driven interface contraction, bulk driving force-induced interface expansion, and mesh size insensitivity to twin propagation. Integrated the FBR model into a coupled Crystal Plasticity Finite Element - Phase Field (CPFE-PF) model, the FBR approach is examined to effectively control interface width, reduce mesh orientation sensitivity, and reproduce twin propagation and transmission across grain boundaries. This robust, computationally efficient FBR model holds promise for broader applications in PF modeling of shear transformation bands with precise interface control.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"196 ","pages":"Article 104569"},"PeriodicalIF":12.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145600093","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 new strategy for fabricating Mg-Al alloys with excellent strength-ductility synergy via pulse-coupled wire-arc directed energy deposition","authors":"Yukang An ,&nbsp;Enyu Guo ,&nbsp;Diyang Xia ,&nbsp;Shuo Yin ,&nbsp;Zhirou Zhang ,&nbsp;Wuyue Zheng ,&nbsp;Zongning Chen ,&nbsp;Huijun Kang ,&nbsp;Tongmin Wang","doi":"10.1016/j.ijplas.2025.104550","DOIUrl":"10.1016/j.ijplas.2025.104550","url":null,"abstract":"<div><div>Wire-arc directed energy deposition (W-DED) is a cost-effective additive manufacturing technology increasingly applied to the fabrication of magnesium alloy components. However, AZ-series magnesium alloys fabricated by conventional DED suffer from inadequate properties and premature failure due to stress concentration caused by coarse structure and high fraction of porosity. In this work, a high-energy pulsed arc is introduced into the W-DED of AZ31B alloy, and its effects on porosity, microstructure, mechanical properties, and deformation damage behavior are comprehensively investigated. The pulsed-coupled DED (CMT+P) process significantly enhances component densification while refining grains and precipitates by intensifying solidification dynamics and modifying solute redistribution. The AZ31B alloy fabricated by CMT+P process exhibits a superior strength-ductility synergy, with ultimate tensile strength of 262 ± 1.5 MPa along BD and 267 ± 2 MPa along TD accompanied by a total elongation of 24.7 ± 1.8 % and 25.4 ± 1.5 %, respectively. <em>In-situ</em> synchrotron tomography from a novel “primary damage band (PDB)” perspective reveals the competitive relationship between initial and derived pores of deformation behavior. During the progressive damage evolution, the optimized structure crucially suppresses derived pore nucleation and delays stress accumulation to enhance damage tolerance and promote uniform plastic deformation. This work provides a new strategy for fabricating high-performance Mg-Al DED components that combine high performance with superior damage resistance.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"196 ","pages":"Article 104550"},"PeriodicalIF":12.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145509404","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}