International Journal of Plasticity最新文献

{"title":"Simultaneously enhancing strength and plasticity via direct ageing in additive manufactured Al–Ni–Sc–Zr alloys","authors":"Guandong Luo ,&nbsp;Han Chen ,&nbsp;Lei Hu ,&nbsp;Chen Yang ,&nbsp;Shuwei Zong ,&nbsp;Yanchi Chen ,&nbsp;Qing Lian ,&nbsp;Hongze Wang ,&nbsp;Zhe Chen ,&nbsp;Yi Wu ,&nbsp;Haowei Wang","doi":"10.1016/j.ijplas.2025.104243","DOIUrl":"10.1016/j.ijplas.2025.104243","url":null,"abstract":"<div><div>Eutectic Al alloys processed by laser powder bed fusion (LPBF) frequently display metastable cellular structures. The cells are susceptible to decomposition into nanoparticles during ageing. Furthermore, supersaturated solutes can result in additional precipitation during the ageing process. The complicated microstructure evolution observed in LPBF eutectic Al alloys necessitates a comprehensive investigation into their ageing behaviour, to identify the optimal strength and plasticity. Consequently, this study presents a systematic examination of the impact of direct ageing on microstructure evolution in an LPBF Al‒Ni‒Sc‒Zr alloy, analysing associated changes in strength and plasticity. The optimal ageing parameters for strength and plasticity are determined. The results demonstrate that the reduction in strength resulting from cell decomposition can be offset by the strengthening provided by nanoparticles formed due to cell wall spheroidisation and additional supersaturated solute precipitation, achieving excellent yield strength. Furthermore, the transformation of cells into nanoparticles significantly enhances the plasticity by increasing non-uniform strain, which is not well explained by the conventional work hardening theory. A detailed investigation suggests that direct ageing can alleviate dislocation pile-up and strain localisation around cell walls, and reduce the tendency for crack propagation along melt pool boundaries, resulting in a significant increase in non-uniform strain and ultimately, excellent tensile plasticity. This study demonstrates that direct ageing is an effective strategy for simultaneously enhancing the strength and plasticity of LPBF Al–Ni based alloys. The proposed plasticity mechanism offers a new insight into the plastic deformation behaviour of LPBF eutectic Al alloys.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"185 ","pages":"Article 104243"},"PeriodicalIF":9.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142937011","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":"Microcracking in additively manufactured tungsten: Experiment and a nano-micro-macro multiscale model","authors":"Zhun Liang ,&nbsp;Junhao Wu ,&nbsp;Changmeng Liu ,&nbsp;Yinan Cui","doi":"10.1016/j.ijplas.2025.104264","DOIUrl":"10.1016/j.ijplas.2025.104264","url":null,"abstract":"<div><div>Microcracking is a prevalent and critical issue in additively manufactured tungsten, significantly restricting its safety-critical engineering applications. Till now, most of our current knowledge about microcracking is based on the observation after additive manufacturing (AM) processing, the real-time evolution of microcracking is still largely unexplored, which is challenged by the complex multi-physics and multiscale nature of AM. To gain deeper insights, a multiscale model is developed in the current work, which integrates a multiphysics thermal-fluid model to consider the solidification process and the evolution of temperature, a crystal plasticity model to explore the evolution of dislocations and stress, as well as an atomistic simulation informed cohesive zone model to consider the microcracking at grain boundary (GB). The simulation results show great agreement with <em>in-situ</em> and <em>ex-situ</em> AM experiments of tungsten. The real-time microcracking evolution at GB in the grain-size scale is captured. It is found that the transverse microcracks that traverse the entire GB typically form after multiple scan tracks. A phase diagram is obtained to correlate microcrack density with scanning speed and power. The effect of non-Schmid effect, GB strength and substrate preheating are also systematically analyzed. This work advances the understanding of microcracking mechanisms in AM, offering valuable guidance for improving the fabrication process to mitigate microcrack formation.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"186 ","pages":"Article 104264"},"PeriodicalIF":9.4,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071792","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":"Role of face centered cubic/body centered cubic phase boundary crystallography on void growth","authors":"Paul G. Christodoulou ,&nbsp;Miroslav Zecevic ,&nbsp;Ricardo A. Lebensohn ,&nbsp;Irene J. Beyerlein","doi":"10.1016/j.ijplas.2025.104259","DOIUrl":"10.1016/j.ijplas.2025.104259","url":null,"abstract":"<div><div>In this work, using a mesoscale model, we investigate void growth as mediated by plastic slip at face-centered cubic (FCC)/body centered cubic (BCC) phase boundaries. We employ a large-strain elasto-visco-plastic fast Fourier transform (LS-EVP-FFT) crystal plasticity model with the advantage of treating smooth conformal void surfaces in a crystal. The calculations aim to identify the role of crystallographic orientation, phase boundary inclination, strain hardening, and BCC slip mode selection. To this end, both model FCC/BCC boundaries and FCC Cu/BCC Ta boundaries are considered, as well as commonly found phase boundary characters and a wide range of orientation relationships. We show that at Kurdjumov–Sachs (K–S) interfaces the void prefers to grow in the BCC crystal regardless of slip mode selection or hardening rate. The void grows faster when two slip modes <span><math><mrow><mrow><mo>〈</mo><mn>111</mn><mo>〉</mo></mrow><mrow><mo>{</mo><mn>110</mn><mo>}</mo></mrow></mrow></math></span> and <span><math><mrow><mrow><mo>〈</mo><mn>111</mn><mo>〉</mo></mrow><mrow><mo>{</mo><mn>112</mn><mo>}</mo></mrow></mrow></math></span> are available in the BCC grain than when only the <span><math><mrow><mrow><mo>〈</mo><mn>111</mn><mo>〉</mo></mrow><mrow><mo>{</mo><mn>110</mn><mo>}</mo></mrow></mrow></math></span> mode is available. The differing hardening rates expected of Cu and Ta lead to an overwhelmingly strong preference for void growth into the Ta side than the Cu side, regardless of orientations, orientation relationships, and phase boundary inclinations.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"186 ","pages":"Article 104259"},"PeriodicalIF":9.4,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056779","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":"Thermodynamically consistent damage evolution model coupled with rate-dependent crystal plasticity: Application to high-strength low alloy steel at various strain rates","authors":"Sandipkumar Dayani ,&nbsp;Waqas Muhammad ,&nbsp;Abhijit Brahme ,&nbsp;Fatemah Hekmat ,&nbsp;Trevor Sabiston ,&nbsp;Kaan Inal","doi":"10.1016/j.ijplas.2025.104255","DOIUrl":"10.1016/j.ijplas.2025.104255","url":null,"abstract":"<div><div>High-strength low-alloy (HSLA) steels demonstrate superior strength and load-bearing capacity compared to traditional plain carbon steel. However, these steels are susceptible to microstructural damage even at intermediate strain rates, which can compromise their performance in automotive application. This research aims to investigate the stress-strain response, internal temperature rise, and damage evolution in HSLA steels under quasi-static and intermediate strain rates. The initial microstructure of two different grades of HSLA steels, HR340 and HR550, are characterized using Electron Backscatter Diffraction (EBSD) data. During uniaxial tensile tests at various strain rates, a high-speed infrared thermal camera is utilized to capture the rise of the instantaneous surface temperature within the gauge section of the specimens. A new, thermodynamically consistent rate-dependent crystal plasticity formulation is developed. The damage evolution is governed by a thermodynamic driving force that accounts for various effects (i.e., temperature, void nucleation, and void growth). A power-law based damage formulation is proposed to account for the effects of strain rates and internal temperature rise on the damage evolution. The constitutive model is implemented into a crystal plasticity (CP) formulation to study the effects of damage, temperature and texture evolution on localized deformation in HSLA steel. The constitutive model is calibrated using experimental stress-strain data and temperature evolution measurements at different strain rates. The new model not only accurately predicts the softening/post-necking behaviour and failure of HR340 and HR550 but also accurately captures temperature variations in the material, aligning well with experimental results. The texture evolution prediction by the developed model also demonstrated good agreement with experimentally observed texture evolution at different strain rates. This study highlights the significant influence of strain rate and internal temperature rise on the damage, dislocation density evolution and microstructural behavior of HSLA steels. The model serves as a robust physics-based foundation for future investigative studies.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"186 ","pages":"Article 104255"},"PeriodicalIF":9.4,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of vanadium microalloying on the deformation behavior and strain hardening of a medium Mn steel","authors":"X. Liu ,&nbsp;L.K. Huang ,&nbsp;K.X. Song ,&nbsp;F. Liu","doi":"10.1016/j.ijplas.2025.104263","DOIUrl":"10.1016/j.ijplas.2025.104263","url":null,"abstract":"<div><div>Microalloying is a well-established approach for tailoring the mechanical properties of conventional steels, yet its effects on the mechanical properties and the underlying deformation mechanism for medium Mn steels remain elusive. Here, we report a thorough investigation of deformation behavior in the intercritically annealed medium Mn steels, both with and without the 0.1 wt.% V microalloying. The V-alloyed steel exhibits comparable yield strength and uniform elongation, but higher ultimate tensile strength and enhanced strain hardening, as compared to the V-free counterpart. Our analysis indicates that the V microalloying preferentially reacts with C atoms to form VC precipitates, which affect the subsequent ferrite to austenite transformation mainly by reducing the C content in the initial ferrite phase rather than impeding the phase interface migration. We reveal that the similar yield strengths originate from the increased strength of ferrite due to refined grain size being offset by the decreased strength of austenite arising from the reduced C content. Furthermore, for the first time, we quantitatively resolve the origins of strain hardening in the V-alloyed and V-free steels, where the transformation-induced plasticity (TRIP) effect, stress partitioning, and dislocation activities make fundamentally different contributions in the two steels. On this basis, we uncover that the extra strain hardening in the V-alloyed steel is ascribed to the rapid TRIP effect, enhanced stress partitioning, and active dislocation accumulation mainly facilitated by statistically stored dislocations. The present findings provide mechanistic insights into the role played by microalloying in modulating the deformation behavior and strain hardening of medium Mn steels.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"186 ","pages":"Article 104263"},"PeriodicalIF":9.4,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056780","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":"Localized brittle intergranular cracking and recrystallization-induced blunting in fatigue crack growth of ductile tantalum","authors":"Rongzheng Huang ,&nbsp;Ye Zhou ,&nbsp;Qidong Yang ,&nbsp;Xujing Yang ,&nbsp;Kai Wei ,&nbsp;Zhaoliang Qu ,&nbsp;Haiqiong Xie ,&nbsp;Xiang Chen ,&nbsp;Daining Fang","doi":"10.1016/j.ijplas.2025.104262","DOIUrl":"10.1016/j.ijplas.2025.104262","url":null,"abstract":"<div><div>Laser powder bed fusion (L-PBF) induces cellular structures that are considered significant contributors to the enhancement of strength and plasticity. However, after conducting fatigue crack growth (FCG) rate tests on L-PBF fabricated tantalum (LPBF-Ta), we found that cellular structures with specific growth directions can abnormally induce local brittle intergranular cracking, indicating that cellular structures are not always a reinforcing factor for fatigue crack resistance. Multiscale microstructural characterization reveals that when cellular structures within grains are simultaneously perpendicular to the primary thermal gradient, loading direction, and the cellular structures in adjacent grains, residual stresses and stress concentrations in cell walls lead to inhomogeneous deformation at grain boundaries, triggering intergranular cracking. Additionally, these cellular structures are more likely to form dislocation networks, which inhibit the cross-slip of screw dislocations, preventing the formation of stable dislocation sources at crack tips and resulting in local embrittlement. Moreover, recrystallization at room temperature leads to inhomogeneous Schmid factors across grains, hindering the formation of persistent slip bands. This promotes fatigue crack blunting and effectively enhances resistance to FCG. The findings of this study may provide insights for researchers focused on grain boundary engineering and computational modeling of FCG.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"186 ","pages":"Article 104262"},"PeriodicalIF":9.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055588","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 distortional hardening based on deviatoric stress invariants under non-associated flow rule. Part-II: Generalization combined with non-quadratic yield function under associated flow rule","authors":"Qi Hu ,&nbsp;Jeong Whan Yoon ,&nbsp;Jun Chen","doi":"10.1016/j.ijplas.2025.104256","DOIUrl":"10.1016/j.ijplas.2025.104256","url":null,"abstract":"<div><div>To control the curvature of yield loci, a generalized anisotropic distortional hardening ADH (G-ADH) model is established within the framework for Bauschinger effect prediction in ADH2022 (Hu and Yoon, 2022). Any yield criterion can be coupled with G-ADH. The convexity of G-ADH depends on the convexity of the coupled yield criterion. Under the proportional loadings, G-ADH still possesses the characteristics of the coupled yield criterion. In the present work, analytical Poly6–18p and Yld2000–2d yield criteria are coupled with G-ADH to predict the yield loci and R-values under the associated flow rule. Applying G-ADH to SPCC, EDDQ and DP780 materials, the result shows that G-ADH still processes the same ability as ADH2022 to predict the Bauschinger effect, permanent softening &amp; strengthening behavior, and work-hardening stagnation &amp; overshooting behavior. Applying G-ADH to AA6061-O and AA7075-T6, the result shows that G-ADH coupled with analytical Poly6–18p is capable of regulating the curvature of yield loci in pure shear and plane strain stress states, and accurately predicting the complex r-curve and uniaxial tension curve.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"186 ","pages":"Article 104256"},"PeriodicalIF":9.4,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044713","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":"Comparative analysis of processing technology on the deformation behavior of Al alloys studied by synchrotron X-ray diffraction and tomography","authors":"Weixiang He ,&nbsp;Yuliang Zhao ,&nbsp;Qiuyun Wei ,&nbsp;Huan Liu ,&nbsp;Baihui Gan ,&nbsp;Dongfu Song ,&nbsp;Zhenzhong Sun ,&nbsp;Yanan Fu ,&nbsp;Zhenhuang Su","doi":"10.1016/j.ijplas.2025.104261","DOIUrl":"10.1016/j.ijplas.2025.104261","url":null,"abstract":"<div><div>Recycled Al-Cu alloys deteriorated mechanical properties due to stress concentration caused by coarse Fe-rich intermetallic (Fe-rich phases). This study aims to comparative analysis of processing technology of ultrasonic melt processing (USMP) or/and Al-Ti-B on microstructure and deformation behavior of Al-Cu alloys. They were investigated using various microscopy technique, such as, scanning/transmission electron microscopy, electron backscattered diffraction, and synchrotron X-ray diffraction and tomography. Heat-treated Al-Cu alloys contained primary Al phase, Al₇Cu₂Fe, and Al₁₅(FeMn)₃(SiCu)₂ phases. The grain sizes of the 0.7FeU (0.7 wt.% Fe + USMP) and 0.7FeUB (0.7 wt.% Fe + USMP + Al-Ti-B) alloys decreased by 25.7% and 42.2%, respectively, compared to the 0.7FeB (0.7 wt.% Fe + Al-Ti-B) alloy. This refinement led to significant improvements in mechanical properties: yield strength, tensile strength, and elongation increased by 18.7%, 53.7%, and 216.7% for 0.7FeUB. USMP resulted in a refined and compact morphology of the Fe-rich phases, reducing stress concentration. Under tensile testing, the fine grains in the 0.7FeUB alloy rotated in multiple directions, promoting uniform plastic deformation and stress distribution. The maximum lattice strain before fracture increased by 100% and 142% for the 0.7FeU and 0.7FeUB alloys, respectively, compared to the 0.7FeB alloy. USMP also enhanced Cu and Mg solubility, resulting in fine precipitates and increased dislocation density, strengthened alloys through solid solution, precipitation, and dislocation strengthening.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"186 ","pages":"Article 104261"},"PeriodicalIF":9.4,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020435","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":"Dislocation dissociation assisted formation mechanism of sigma phase and its impact on producing heterogeneous lamellar microstructure in CoCrV medium-entropy alloy","authors":"Luda Wang ,&nbsp;Hai-Le Yan ,&nbsp;Yudong Zhang ,&nbsp;Benoit Beausir ,&nbsp;Weimin Gan ,&nbsp;Peltier Laurent ,&nbsp;Nathalie Siredey-Schwaller ,&nbsp;Claude Esling ,&nbsp;Xiang Zhao ,&nbsp;Liang Zuo","doi":"10.1016/j.ijplas.2025.104260","DOIUrl":"10.1016/j.ijplas.2025.104260","url":null,"abstract":"<div><div>Control of topologically close-packed sigma phase, meaning limiting its massive presence to avoid embrittlement but benefiting its refinement and strengthening effect, is of particular interest. In-depth knowledge of dislocation-associated formation mechanisms is needed but not well addressed. In this work, an FCC-phased Co_66.66Cr_16.67V_16.67 medium entropy alloy (MEA) with a propensity to form the sigma phase at non-equilibrium conditions was studied. The alloy was conventionally cold-rolled and heat-treated. The dislocation activity rooted formation mechanisms of the sigma phase were thoroughly characterized and evidenced by <em>in-situ</em> and <em>ex-situ</em> multi-scale diffraction techniques. It was revealed that nano-sized sigma particles enriched in Cr and V and depleted in Co were precipitated ultra-rapidly and uniquely during the heating process after the cold-rolling. The precipitation is spatially inhomogeneous, mainly in the severely deformed regions. The ultra-rapidity of the precipitation was achieved by the segregation of the Cr and V atoms via crystal defect-aided diffusion for composition change and by structure transformation via dislocation dissociation. The similarity of the atomic arrangement of the partial dislocations to that of the {001} sigma planes provides favorable structure transformation stimulus. In consequence, the orientations of the intensively activated dislocation slip planes dictated those of the sigma {001} planes via the FCC {111} to sigma {001} heredity, leading to the specific sigma texture. Owing to the spatially inhomogeneous precipitation, a heterogeneous lamellar microstructure was formed, composed of alternatively distributed fine dual-phased layers and coarse single-phased layers. This work provides comprehensive information on the dislocation-dissociation-assisted formation mechanism of sigma phase.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"186 ","pages":"Article 104260"},"PeriodicalIF":9.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of elemental combination, stacking fault energy and temperature on the tensile deformation behavior of single crystals of quinary, quaternary and ternary equiatomic high- and medium-entropy alloys derived from the Cr-Mn-Fe-Co-Ni system","authors":"Le Li,&nbsp;Zhenghao Chen,&nbsp;Seiko Tei,&nbsp;Yusuke Matsuo,&nbsp;Ryosuke Chiba,&nbsp;Haruyuki Inui","doi":"10.1016/j.ijplas.2025.104257","DOIUrl":"10.1016/j.ijplas.2025.104257","url":null,"abstract":"<div><div>The effects of elemental combination, stacking fault energy (SFE) and temperature on the deformation behavior of single crystals of equiatomic high- and medium-entropy alloys (HEA and MEAs) with the face-centered cubic structure derived from the Cr-Mn-Fe-Co-Ni system have been investigated in tension at room temperature and 77 K. The SFE of these alloys varies from 83 mJ/m² to 14 mJ/m² and the efficiency in decreasing the SFE increases in the order of Cr&gt;Co&gt;&gt;Mn&gt;Fe. For all the HEA and MEAs investigated, the critical resolved shear stress for slip increases remarkably from room temperature to 77 K but does not exhibit any significant compression-tension asymmetry at both temperatures. Deformation in Stage I occurs in the form of Lüders band, the extent of which is temperature-independent but increases with the extent of solid-solution strengthening (SSS). The extent of yield drop increases also with the extent of SSS and with decreasing temperature. The work hardening rate of Stage II does not vary significantly from alloy to alloy but is slightly higher at 77 K than at room temperature. Deformation twinning occurs only in the Cr-Co-Ni MEA at room temperature, but at 77 K, it occurs in six HEA and MEAs with SFE≤32 mJ/m². Consequently, while at room temperature only the Cr-Co-Ni MEA exhibits remarkably superior tensile elongation, the tensile elongation at 77 K tends to increase with decreasing SFE in particular for those (with SFE≤32 mJ/m²) twin. The effects of twinning mechanisms (nucleation- and propagation-controlled twinning) on the twinning stress-SFE relationship are discussed.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"186 ","pages":"Article 104257"},"PeriodicalIF":9.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}