International Journal of Plasticity最新文献

{"title":"Microstructural origins of enhanced creep resistance in laser printed Ti-6Al-4V","authors":"Zhun Liang ,&nbsp;Mingyang Zhang ,&nbsp;Zheng Guo ,&nbsp;Zongchang Guo ,&nbsp;Yinan Cui","doi":"10.1016/j.ijplas.2026.104637","DOIUrl":"10.1016/j.ijplas.2026.104637","url":null,"abstract":"<div><div>Creep resistance is critical for the reliability of engineering structures at high temperatures. In this study, <em>in situ</em> scanning electron microscope (SEM) creep experiments show that laser powder bed fusion fabricated Ti-6Al-4V (LPBF Ti-6Al-4V) exhibits a creep lifetime about three to five times longer than that of forged Ti-6Al-4V. Distinct creep failure mechanisms were identified, with grain boundary sliding dominating in the forged Ti-6Al-4V, while void-induced grain boundary separation controlled the LPBF Ti-6Al-4V. By integrating experiments with a multiphysics coupled microscale creep model that simultaneously captures diffusion creep, dislocation glide and climb, grain boundary sliding, and void evolution, the results suggest that the elongated grain morphology and lower dislocation density in LPBF Ti-6Al-4V contribute to its enhanced creep performance. A physics-informed neural network (PINN)-driven multiscale creep framework is developed to bridge the gap between the mechanistic microscale creep model and macroscale creep life prediction. This work provides new insights into the creep resistance of additively manufactured titanium alloys and presents a promising approach for multiscale creep life assessment.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"199 ","pages":"Article 104637"},"PeriodicalIF":12.8,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146116217","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":"Microstructure-induced fatigue scatter of additively manufactured inconel 718: Insight from multilevel simulations and dislocation-based strain gradient crystal plasticity","authors":"Xian-Chen Kuang ,&nbsp;Wu-Gui Jiang ,&nbsp;Long-Hui Mao ,&nbsp;Zhi-Kai Wu ,&nbsp;Fen-Cheng Liu ,&nbsp;Xiang Zhou ,&nbsp;Peng-Hang Ling ,&nbsp;Yang-Cheng Zhang ,&nbsp;Min Yi","doi":"10.1016/j.ijplas.2026.104632","DOIUrl":"10.1016/j.ijplas.2026.104632","url":null,"abstract":"<div><div>The fatigue performance of additively manufactured (AM) Inconel 718 is intrinsically governed by its grain morphology, necessitating a predictive understanding of the underlying plasticity-dominated mechanisms. To address this challenge, this study applies an integrated multilevel computational framework that explicitly bridges the process–structure–property–performance chain by coupling finite-element and cellular-automata (FE–CA) simulations of grain growth during laser powder bed fusion (LPBF), a deep neural network (DNN) for efficient material parameter calibration, and a strain-gradient crystal plasticity finite element (CPFE) model for fatigue life prediction. This unified framework enables, for the first time, a rigorous like-for-like comparison of three characteristic AM microstructures—equiaxed, columnar, and mixed grains—under a consistent computational and experimental calibration protocol, and thereby reveals new micromechanical insights into potential fatigue damage initiation from the plasticity perspective. Our simulations indicate that fatigue resistance is predominantly controlled by grain morphology and further modulated by morphology-induced anisotropy. Among them, equiaxed grains exhibit superior fatigue resistance to columnar and mixed grain morphologies, which is attributed to the activation of multiple slip systems and the resulting homogeneous deformation. In contrast, the strong texture in columnar grains gives rise to a pronounced “channeling effect”, leading to highly localized slip and a mismatch between regions of elevated plastic strain and actual damage accumulation. In terms of loading direction, the fatigue resistance under loading along the building direction (BD) is higher than that under loading along the transverse direction (TD). Crack initiation is predominantly predicted at high-angle grain boundaries and triple junctions, with the specific patterns highly sensitive to both grain morphology and loading direction. A key finding is the identification of a critical fatigue indicator parameter (FIP) threshold, beyond which fatigue life scatter intensifies significantly. While the CPFE model provides accurate predictions at intermediate strain amplitudes, its efficacy diminishes at higher strains due to the activation of alternative failure mechanisms. Overall, by integrating established computational methods, this work provides microstructure-sensitive insights and a practical framework for fatigue life prediction of AM materials, offering a potential pathway for AM process and microstructure optimization to achieve superior fatigue performance.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"198 ","pages":"Article 104632"},"PeriodicalIF":12.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146101602","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":"Investigating creep damage initiation at the mesoscale using high-resolution electron microscopy, crystal plasticity modelling, and a classification algorithm","authors":"Farhan Ashraf ,&nbsp;Nicolò Grilli ,&nbsp;Chen Liu ,&nbsp;Michael Salvini ,&nbsp;Catrin M. Davies ,&nbsp;Christopher E. Truman ,&nbsp;Mahmoud Mostafavi ,&nbsp;David Knowles","doi":"10.1016/j.ijplas.2026.104627","DOIUrl":"10.1016/j.ijplas.2026.104627","url":null,"abstract":"<div><div>Accurate modelling of plastic and creep deformation, along with the associated damage mechanisms in 316H stainless steel under high-temperature and complex loading conditions, is essential for ensuring the long-term structural integrity of power plant components. Robust physics-based models contribute to more accurate life assessment procedures, thereby improving safety and extending component service life under creep conditions. However, current approaches often lack accurate microstructure-sensitive models that can correlate experimentally observed local creep damage with key microstructural features such as grain orientation and morphology in creep damage prediction.</div><div>To address this knowledge gap, a combined modelling and experimental approach is employed to investigate creep damage initiation in 316H stainless steel at 550 °C. A crystal plasticity finite element (CPFE) model is developed to simulate the primary and secondary stages of creep deformation. To accurately predict local deformation under realistic boundary conditions, a new modelling strategy is introduced, embedding crystal plasticity domains within larger-scale geometries. Furthermore, a novel methodology is introduced to define damage initiation criterion by employing a classification algorithm to correlate experimentally observed creep damage with internal variables from the CPFE model. This data-driven approach enables the development of a predictive equation for identifying damaged grain boundaries. This equation represents a significant advancement over phenomenological approaches, such as the stress-modified ductility exhaustion (SMDE) model. The proposed model predicts approximately 67% of observed creep cavities at grain boundaries in the analysed regions, demonstrating the strong potential of a data-driven modelling framework for microstructure-sensitive damage prediction.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"198 ","pages":"Article 104627"},"PeriodicalIF":12.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146072352","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 twinning mechanisms and martensitic transformation in Fe60Mn12Cr12Ni8Si8 high entropy alloy under cyclic tension-compression loading","authors":"Lin Guo ,&nbsp;Jiaxing Wu ,&nbsp;Ji Gu ,&nbsp;Dechuang Zhang ,&nbsp;Cheng Ma ,&nbsp;Yilong Dai ,&nbsp;Jianguo Lin ,&nbsp;Ian Baker ,&nbsp;Min Song","doi":"10.1016/j.ijplas.2026.104613","DOIUrl":"10.1016/j.ijplas.2026.104613","url":null,"abstract":"<div><div>Twinning and martensitic transformations are well-understood under monotonic loading, yet how stress reversal and the associated kinematic reversibility, inherent to cyclic deformation, affects these mechanisms remains insufficiently understood. Here, we systematically investigate the microstructural evolution of a metastable high entropy alloy Fe₆₀Mn₁₂Cr₁₂Ni₈Si₈ under cyclic tension-compression (CTC) loading. Multi-scale characterizations reveal that the cyclic stress reversal fundamentally alters the transformation pathway compared to the monotonic tension. The initial, undeformed material consists of a face-centered cubic γ phase. Monotonic tension primarily activates deformation-induced martensitic transformation, whereas CTC produces markedly different microstructural pathways depending on strain amplitude. At a low strain amplitude (0.5%), short-range glide of Shockley partial dislocations promotes extensive formation of HCP ε-martensite (a fraction of ∼68.3%). In contrast, high-strain-amplitude CTC loading (2.0%) activates an abnormal transformation-mediated twinning mechanism. This process, driven by the reversible motion of Shockley partial dislocation within confined ε-martensite, leads to a refined γ/γ_twin/ε nano-laminate structure with a spacing of ∼2.6 nm. Furthermore, we identify unconventional polymorphic transformation pathways accommodating the high local stress concentrations: (i) nucleation of body-centered cubic α′-martensite at a specific interface where the two γ phases maintain an 86° angle between their respective <span><math><msub><mrow><mo>(</mo><mrow><mn>11</mn><mover><mn>1</mn><mo>¯</mo></mover></mrow><mo>)</mo></mrow><mi>γ</mi></msub></math></span> planes, and (ii) a direct γ to body-centered tetragonal α-martensite transition via continuous lattice shearing along <span><math><mrow><mrow><mo>(</mo><mn>111</mn><mo>)</mo></mrow><msub><mrow><mo>[</mo><mrow><mn>11</mn><mover><mn>2</mn><mo>¯</mo></mover></mrow><mo>]</mo></mrow><mi>γ</mi></msub></mrow></math></span>. These mechanisms are attributed to the unique stress accommodation requirements in the highly confined nano-laminates. The resulting hierarchical microstructure not only relieves local stress concentrations but also contributes to the good cyclic durability. Overall, these findings establish an atomistic mechanistic link between cyclic reversibility and transformation/twinning pathway selection, and suggest a processing-enabled route to engineer heterogeneous γ/γ_twin/ε nano-laminate structure in bulk metastable alloys at room temperature.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"198 ","pages":"Article 104613"},"PeriodicalIF":12.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145993424","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":"Obtaining superior strength-ductility synergy properties in a medium-entropy alloy via dual heterogeneous and TRIP effects","authors":"Wenjie Lu ,&nbsp;Bin Huang ,&nbsp;Rui Hu ,&nbsp;Xu-Sheng Yang","doi":"10.1016/j.ijplas.2026.104624","DOIUrl":"10.1016/j.ijplas.2026.104624","url":null,"abstract":"<div><div>Activating additional strain-hardening mechanisms is essential to achieve superior strain hardening capacity and strength-ductility synergy in precipitation-hardened alloys. In this work, we introduce a synergistic strategy that combines dual-heterogeneous structures (DHS) with the transformation-induced plasticity (TRIP) effect in a precipitation-hardened medium-entropy alloy (MEA), thereby enabling multiple strain-hardening mechanisms for the exceptional strength-ductility combination. The tailored alloy showcases a high yield strength of ∼ 1290 MPa, an ultimate tensile strength of ∼ 1737 MPa, and an excellent fracture elongation of ∼ 36.9% at ambient temperature, exhibiting a ∼ 162% increase in yield strength without compromising uniform ductility, compared to its single-phase solid solution counterpart. Microstructural analyses reveal that the enhanced yield strength stems primarily from precipitation hardening and extra hetero-deformation induced (HDI) hardening. Furthermore, plastic deformation mechanism investigations demonstrate that the remarkable work-hardening capacity (&gt; 3 GPa) results from the combined effects of dynamically enhanced HDI hardening and the activated TRIP effect during tensile deformation. These multiple and sustained strain-hardening mechanisms underpin the alloy’s exceptional strength-ductility synergy. Our study provides a promising strategy for designing high-performance structural materials.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"198 ","pages":"Article 104624"},"PeriodicalIF":12.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146033004","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":"Deformation behavior and microstructural evolution of Ti-6Al-4 V alloy under compression with confining pressure","authors":"Yanxiong Liu ,&nbsp;Han Zhang ,&nbsp;Lin Hua ,&nbsp;Feng Huang ,&nbsp;Kaisheng Ji ,&nbsp;Yizhe Chen ,&nbsp;Junnan Mao","doi":"10.1016/j.ijplas.2026.104610","DOIUrl":"10.1016/j.ijplas.2026.104610","url":null,"abstract":"<div><div>Ti-6Al-4 V alloys have attracted increasing attention as candidates to meet targets for lightweight applications in the automotive, aerospace and other industries. To improve the plastic deformation capacity and mechanical properties of deformed parts, this paper proposes a forming process under superimposed hydrostatic pressure. Ti-6Al-4 V alloys were subjected to compression under liquid at a pressure of 175 MPa, which caused superimposed hydrostatic pressure during the compression process. This study revealed the deformation behavior and microstructural evolution of Ti-6Al-4 V alloys under such loading conditions for the first time through experimental, simulation and theoretical analyses. Multiscale characterization (SEM/XRD/TEM) reveals that hydrostatic pressure induces activation of {<span><math><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>1</mn></mrow></math></span>} and {<span><math><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn></mrow></math></span>} α-twins to accommodate deformation, the formation of coherent α/β interfaces and a nonrandom V distribution in the α phase. In comparison to the normal-pressure compression sample, the ultimate compressive strength, hardness, and compression ratio were only 1229.9 MPa, 294.1 HV, and 35%, respectively. The high-pressure compression sample exhibits a superior combination of strength, as evidenced by its ultimate compressive strength (2004.9 MPa), hardness (364.8 HV), and plasticity (42.5% compression ratio). The synergy is attributed to three coupled mechanisms under high pressure: twinning-induced plasticity, interface strengthening and short-range ordering strengthening. Furthermore, theoretical geometrical phase analysis and crystal plasticity simulations reveal that high pressure decreases the stress in the α phase. The resulting significant improvement in both tensile and compressive strains can lead to the formation of a high density of twins. Concurrently, it has been demonstrated to increase the resistance of the β phase to stress, thereby preventing the β phase cracking that is frequently observed in normal pressure compression. These results provide a promising pathway for overcoming the severe engineering challenges caused by the low room-temperature plasticity of Ti-6Al-4 V alloys.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"198 ","pages":"Article 104610"},"PeriodicalIF":12.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995367","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":"Size-dependent tensile behavior of nanocrystalline HfNbTaTiZr high-entropy alloy: Roles of solid-solution and local chemical order","authors":"Yihan Wu ,&nbsp;Gaosheng Yan ,&nbsp;Pengfei Yu ,&nbsp;Yaohong Suo ,&nbsp;Wenshan Yu ,&nbsp;Shengping Shen","doi":"10.1016/j.ijplas.2026.104626","DOIUrl":"10.1016/j.ijplas.2026.104626","url":null,"abstract":"<div><div>This study investigates the size-dependent mechanical behavior of the HfNbTaTiZr refractory high-entropy alloy (RHEA) under uniaxial tension, with a focus on the effects of random solid-solution (RSS) and local chemical order (LCO). A machine learning framework is developed to accelerate the parameterization of interatomic force fields (FFs), enabling molecular dynamics simulations of three nanocrystalline models: (i) a meta-atom (MA) model representing the RHEA as a hypothetical single-element system with averaged properties, (ii) a quinary RSS model with randomly distributed constituent atoms, and (iii) a Monte Carlo (MC) model with internal LCO. The results reveal that RSS enhances strength, while LCO reduces flow stress level but improves strain hardening and failure resistance. A transition from Hall–Petch (HP) strengthening to inverse Hall–Petch (IHP) softening is observed, with LCO suppressing this transition. The associated plastic mechanisms (i.e., dislocation slip, deformation twinning, phase transformation and grain boundary movements) are analyzed from both nanostructural and energetic perspectives. Theoretical models are established to describe the size-dependent yield strength and estimate the critical grain size. Additionally, the contributions of different plastic mechanisms to the overall stress response are separately quantified. These findings provide new insights into the design and performance optimization of RHEAs through nanostructural engineering.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"198 ","pages":"Article 104626"},"PeriodicalIF":12.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146071511","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 precipitation evolution and dislocation accumulation in CNT/2024Al composites with dual heterostructure","authors":"Jun Yan ,&nbsp;Cunsheng Zhang ,&nbsp;Zhenyu Liu ,&nbsp;Yingzhi Li ,&nbsp;Zhen Zhang ,&nbsp;Liang Chen ,&nbsp;Guoqun Zhao","doi":"10.1016/j.ijplas.2026.104631","DOIUrl":"10.1016/j.ijplas.2026.104631","url":null,"abstract":"<div><div>Heterogeneous structure can simultaneously improve the strength and ductility of composites. However, the inherent structural and compositional differences pose a significant challenge for heat treatment. In this work, a dual-heterostructured CNT/2024Al composite with non-uniformly distributed reinforcements and heterogeneous grain structure was fabricated by accumulative extrusion bonding. Meanwhile, the heterogeneous precipitation evolution and dislocation accumulation in the composite were systematically investigated. Compared with conventional aging (180°C × 12h), pre-stretching combined with low-temperature aging (100°C × 60h) can refine precipitates in both the soft and hard zones, thereby improving the yield strength and ultimate tensile strength by 41% and 17%, respectively. Soft and hard zones exhibit distinct precipitation behaviors, and the added reinforcements, such as CNTs and Al₄C₃, serve as nucleation sites for precipitation in the hard zone, promoting the formation of precipitate-free zones and interfacial phases. Moreover, a high density of mobile dislocations is induced by pre-stretching, thereby suppressing the formation of Lüders bands. As two-beam diffraction and stereo-pair analyses results show, the [110]<span><math><mrow><mo>(</mo><mover><mn>1</mn><mo>¯</mo></mover><mn>11</mn><mo>)</mo></mrow></math></span> slip dislocations nucleate at heterogeneous interfaces and slip into the soft zone, and the shear stress experienced by dislocations decreases with increasing distance from the interface. The slip systems of three dislocation segments in the hexagonal dislocation network are <span><math><mrow><mo>[</mo><mn>01</mn><mover><mn>1</mn><mo>¯</mo></mover><mo>]</mo></mrow></math></span>(011), [110](001), and [101]<span><math><mrow><mo>(</mo><mover><mn>1</mn><mo>¯</mo></mover><mn>11</mn><mo>)</mo></mrow></math></span>. This work offers new insights for improving the mechanical properties of heterogeneous composites.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"198 ","pages":"Article 104631"},"PeriodicalIF":12.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146095705","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":"Crystal plasticity modeling of ratchetting in FCC alloys","authors":"Kunqing Ding ,&nbsp;Theodore Zirkle ,&nbsp;Xing Liu ,&nbsp;Gustavo M. Castelluccio ,&nbsp;Bryan D. Miller ,&nbsp;Jonathan L. Wormald ,&nbsp;Benjamin S. Anglin ,&nbsp;Thomas W. Webb ,&nbsp;David L. McDowell ,&nbsp;Ting Zhu","doi":"10.1016/j.ijplas.2026.104611","DOIUrl":"10.1016/j.ijplas.2026.104611","url":null,"abstract":"<div><div>Ratchetting is the progressive, unidirectional accumulation of plastic strain during asymmetric stress cycling with nonzero mean stress. Modeling ratchetting is challenging, especially under complex cyclic loading conditions. Most existing constitutive models rely on phenomenological back stress formulations to characterize ratchetting responses, but they are only loosely connected to underlying physical mechanisms. This work develops a microstructure-sensitive crystal plasticity (MS-CP) model for ratchetting in face-centered cubic (FCC) alloys, applied to Alloy 600 (A600) and 304L stainless steel (SS). The model incorporates back stress evolution for slip systems, driven by both deformation-induced dislocation substructures and precipitate–dislocation interactions. The simulated monotonic and ratchetting responses at room and elevated temperatures are validated against experimental stress–strain data. Results highlight the strengthening effects of dislocation substructures in both alloys and of precipitates in A600, as well as the role of substructure evolution in ratchetting responses. This MS-CP model provides a physically grounded framework for modeling in FCC alloys under complex cyclic loading, supporting improved life predictions for components in service.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"198 ","pages":"Article 104611"},"PeriodicalIF":12.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145962418","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":"Adiabatic shear instability mechanisms in BCC TiHfZrTaNb high entropy alloy: insights from microscale experiments and simulations","authors":"Jianguo Li ,&nbsp;Tianqi Zhou ,&nbsp;Xinjie Yang ,&nbsp;Zhongbin Tang ,&nbsp;Tao Suo","doi":"10.1016/j.ijplas.2026.104625","DOIUrl":"10.1016/j.ijplas.2026.104625","url":null,"abstract":"<div><div>Refractory high-entropy alloys (RHEAs) hold great promise for impact engineering due to their superior dynamic mechanical properties. However, the limited understanding of the adiabatic shear instability mechanism in these alloys restricts their effective design and application for enhanced impact performance. This study provides a comprehensive investigation into the mechanical responses of near-equiatomic TiZrHfNbTa RHEA across a wide range of temperature and strain rate. Upon impact compression to substantial strains, adiabatic shear bands (ASBs) emerge as the predominant failure mode. Utilizing an <em>in situ</em> high-speed “force-heat-deformation” synchronous testing system based on the split Hopkinson pressure bar, we have meticulously characterized the initiation and propagation of ASBs. Our work clearly elucidates the pronounced adiabatic temperature rise associated with localized shear deformation. Moreover, through quasi-<em>in situ</em> microstructural evolution analysis, we have delineated the microscopic evolution wherein local deformation sites expand and interconnect along the most deformable grains, ultimately leading to the formation of through-shear zones. Additionally, we have uncovered the micro-mechanism by which dynamic recrystallization (DRX) within these shear zones induces plastic instability. To quantitatively decouple the specific contributions of thermal softening and dynamic recrystallization softening to dynamic instability, we have developed a crystal plasticity mechanical constitutive model to accurately capture the mechanical responses of the RHEA by incorporating the influence of dynamic recrystallization evolution. Our findings highlight the crucial role of DRX softening in driving local shear instability in the RHEA. By combining full-process microcharacterization with mesoscale crystal plasticity finite element simulations, this work offers a precise analysis of the formation mechanism underlying the dynamic instability in BCC RHEA. This research is expected to provide a robust theoretical foundation for the future design of advanced metallic materials with enhanced impact performance.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"198 ","pages":"Article 104625"},"PeriodicalIF":12.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146056096","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}