International Journal of Plasticity最新文献

{"title":"3D strain heterogeneity and fracture studied by X-ray tomography and crystal plasticity in an aluminium alloy","authors":"Maryse Gille ,&nbsp;Henry Proudhon ,&nbsp;Jette Oddershede ,&nbsp;Romain Quey ,&nbsp;Thilo F. Morgeneyer","doi":"10.1016/j.ijplas.2024.104146","DOIUrl":"10.1016/j.ijplas.2024.104146","url":null,"abstract":"<div><div>Strong correlations between measured strain fields and 3D crystal plasticity finite element (CP-FE) predictions based on the real microstructure are found for a plane strain tensile specimen made of 6016 T4 aluminium alloy. This is achieved using multimodal X-ray lab tomography giving access to both the initial grain structure and the strain evolution. The real microstructure of the central region of interest (ROI) of the undeformed specimen is obtained non destructively using lab-based diffraction contrast tomography (DCT) and meshing. An <em>in situ</em> tensile test, using absorption contrast tomography (ACT) is then performed for twelve loading increments up to fracture. Taking advantage of the plane strain condition, the evolution of the internal strain field is measured by two-dimensional digital image correlation (DIC) in the material bulk using the natural speckle provided by intermetallic particles. Early strain heterogeneities in the form of slanted bands, that are spatially stable over time, are revealed and the fracture path – determined from the <em>post mortem</em> scan – is found to coincide with the bands exhibiting maximum strain. CP-FE simulations are performed on the meshed microstructure of the specimen acquired by DCT and are compared with image correlation measurements. The measured strain fields are well described by 3D CP-FE predictions, whilst it is shown that neither a macroscopic anisotropic plasticity model nor a CP-FE simulation with random grain orientations could reproduce the measurements.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104146"},"PeriodicalIF":9.4,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142415544","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":"Enhancing the ductility and yield strength of 2.7Mn steel via two-step partitioning heat treatment","authors":"Wenlu Yu ,&nbsp;Lihe Qian ,&nbsp;Chaozhang Wei ,&nbsp;Kaifang Li ,&nbsp;Yipeng Ding ,&nbsp;Pengfei Yu ,&nbsp;Zhixuan Jia ,&nbsp;Fucheng Zhang ,&nbsp;Jiangying Meng","doi":"10.1016/j.ijplas.2024.104148","DOIUrl":"10.1016/j.ijplas.2024.104148","url":null,"abstract":"<div><div>Fresh martensite (FM) is often present in medium-Mn steels, especially when containing lower Mn content, due to the insufficient thermal stability of reverted austenite; this FM is brittle, largely deteriorating the ductility. In this paper, large ductility and high yield strength are achieved in an Al/Si-added medium-Mn steel containing 2.7Mn via a two-step partitioning heat treatment, i.e. intercritical annealing (IA) followed by low-temperature partitioning (LTP). We show that, during the IA, C and Mn atoms partition from the pre-quenched martensite to reverted austenite; Al addition reduces the size of reverted austenite and promotes C and Mn enrichment in the reverted austenite by decelerating its growth kinetics. This enables the reverted austenite more thermally stabilized, thereby reducing the amount of FM and increasing the amount and mechanical stability of retained austenite (RA) at room temperature. During the LTP, accompanied with the recovery of dislocations and the suppression of carbide precipitation by Al and Si, C atoms further partition from FM to RA, which enables the RA more mechanically stabilized and thereby sustains the high strain hardening to larger strains. Simultaneously, the FM becomes less hard and less brittle due to C atoms depletion and dislocations recovery, alleviating the stress/strain localization and favoring the uniform plastic deformation. Furthermore, the decrease in mobile dislocation density that is accompanied with the recovery of dislocations is believed to be mainly responsible for the enhanced yield strength of the steel. The present results indicate that the synergetic effects of the primary element partitioning (promoted by Al) during IA, which increases the thermal stability of reverted austenite, and the secondary element partitioning (enhanced by Al and Si) and as well dislocation recovery during LTP, which increases the mechanical stability of RA and the uniformity of plastic deformation, significantly enhance both the ductility and yield strength of medium-Mn steel with low Mn content.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104148"},"PeriodicalIF":9.4,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142398112","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":"Overcoming the strength and ductility trade-off in Ni-based alloy through tailoring of bimodal grain structures, hierarchical twins and coherent nanoprecipitates","authors":"Yijie Ban ,&nbsp;Liang Huang ,&nbsp;Zhonghao Li ,&nbsp;Yunzhang Li ,&nbsp;Yi Zhang ,&nbsp;Jie Pan","doi":"10.1016/j.ijplas.2024.104147","DOIUrl":"10.1016/j.ijplas.2024.104147","url":null,"abstract":"<div><div>The longstanding strength-ductility trade-off has posed a significant challenge in materials science, limiting the potential applications of numerous structural materials. It is crucial to improve performance by adjusting microstructures to activate a synergistic effect of multiple strengthening/deformation mechanisms. In this study, we introduce a novel strategy to develop a multi-scale heterogeneous structure in a Ni-based alloy, characterized by a bimodal grain distribution with small grains containing high-density hierarchical twins (third-order), oversized grains devoid of twins. The combination of microstructural heterogeneity and deliberate twin distribution enables the alloy to exhibit specific strengthening and deformation mechanisms in different regions, enhancing the matrix and effectively distributing the stress and strain. Simultaneously, nanoscale L1₂ precipitates with an extremely low lattice mismatch (0.193 %) distributed across all grains, reducing the accumulation of elastic strain caused by dislocation movement and thereby preventing crack initiation at interfaces. The unique hindrance and accommodation of dislocations by this structure significantly enhance strength without sacrificing ductility, achieving a yield strength as high as 1498.6 MPa and a uniform elongation of 18 %. During tensile deformation, small grains with twins and oversized grains exhibit different abilities to absorb and constrain dislocations. Hierarchical twins facilitate interactions with dislocations in multiple directions. Various deformation mechanisms, including a high density of tiny stacking faults, Lomer-Cottrell locks, and short twins, are activated, particularly in the oversized grains, which promote increased dislocation multiplication and accumulation, contributing to the high strain hardening ability and excellent ductility. This study offers a novel paradigm and insights for designing ultra-strong and ductile alloys by managing multi-scale microstructural heterogeneities.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104147"},"PeriodicalIF":9.4,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142398274","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":"The interactions of deformation twins, zirconium hydrides, and microcracks","authors":"Saiedeh Marashi,&nbsp;Hamidreza Abdolvand","doi":"10.1016/j.ijplas.2024.104149","DOIUrl":"10.1016/j.ijplas.2024.104149","url":null,"abstract":"<div><div>One of the main degradation mechanisms of the zirconium alloys used in nuclear reactors is hydrogen embrittlement and the formation of zirconium hydrides. This study focuses on understanding the interactions among deformation twins, hydrides, and the microcracks that form within hydrides. For this purpose, in-situ scanning electron microscopy and interrupted ex-situ tensile experiments were conducted on hydrided zirconium specimens with favorable initial textures for the formation of extension twins. Electron backscatter diffraction (EBSD) was used to measure the orientations of the grains located in the specimens’ gauges and map them into a crystal plasticity finite element model to study hydrides and twins interactions. High spatial resolution EBSD and high-resolution imaging were used to follow the formation of microcracks, and twins live. Although the specimens were deformed to a moderate level of applied strain (∼7 %), it was observed that two types of twins nucleate, <span><math><mrow><mo>{</mo><mn>10</mn><mover><mrow><mn>1</mn></mrow><mo>‾</mo></mover><mn>2</mn><mo>}</mo></mrow></math></span> and <span><math><mrow><mo>{</mo><mn>11</mn><mover><mrow><mn>2</mn></mrow><mo>‾</mo></mover><mn>1</mn><mo>}</mo></mrow></math></span>. While the former nucleates either before or after the nucleation of microcracks within hydrides, the latter nucleates after the formation of microcracks and grows with them. It is shown that the formation of twins may contribute to crack nucleation, yet the shear energy density on a given slip system within hydrides is the main driving force for crack nucleation. Regardless of hydride interactions with twins, a significant slip activity is recorded within hydrides prior to cracking.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104149"},"PeriodicalIF":9.4,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142398113","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":"Crystal plasticity based investigation of the effects of additive manufactured voids on the strain localisation behaviour of Ti-6Al-4V","authors":"Haocheng Sun,&nbsp;Esteban P. Busso,&nbsp;Chao Ling,&nbsp;Dong-Feng Li","doi":"10.1016/j.ijplas.2024.104141","DOIUrl":"10.1016/j.ijplas.2024.104141","url":null,"abstract":"<div><div>The presence of defects produced by additive manufactured (AM) processes in structural Ti alloys such as Ti-6Al-4V is known to have serious implications on the deformation and fatigue behaviour of engineering components. However, there is little understanding about the localised plastic deformation patterns that develop around AM defects, and the associated local conditions that could lead to the nucleation of micro-cracks under creep loading conditions. In this work, the effects of the morphology and volume fraction of AM defects and temperature on the strain localisation behaviour around such defects in Ti-6Al-4V will be addressed. To that purpose, a novel rate-dependent crystal plasticity formulation is proposed to describe the mechanical behaviour of the alloy’s predominant <span><math><msup><mrow><mi>α</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span>(HCP)-phase. Representative volume elements (RVEs) of the AM produced microstructures are digitally reconstructed from EBSD orientation maps obtained on planes perpendicular and transversal to the microstructure’s AM growth direction. Calibration of the single crystal model for the <span><math><msup><mrow><mi>α</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span>-phase is carried out from macroscopic uniaxial tensile data from polycrystalline AM specimens at different strain rates and temperatures and published creep data.</div><div>Furthermore, RVEs containing AM defects of different morphologies and volume fractions are relied upon to investigate the strain localisation behaviour around the defects under uniaxial loading at ambient and high temperatures. It is found that the extent of the localised accumulated plastic strain around defects depends greatly on whether the voids surface are smooth or have sharp corners, with the latter being associated with more severe localisation patterns. Moreover, a numerical investigation into the crack initiation behaviour of AM Ti-6Al-4V under uniaxial creep loading at 450 ° C revealed that the development of the local conditions suitable for the nucleation of creep damage/micro-cracks is accelerated in the presence of typical AM defects, and the extent of that acceleration depends strongly on their morphology. An AM defect shape parameter is introduced to quantify the way their morphology affects the time for creep crack initiation/damage.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104141"},"PeriodicalIF":9.4,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142377534","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":"Simultaneous improvement of strength and plasticity: Nano-twin construction for a novel high-nitrogen TWIP steel","authors":"Sihan Lu ,&nbsp;Qingchuan Wang ,&nbsp;Tingting Yao ,&nbsp;Hao Feng ,&nbsp;Ming Gao ,&nbsp;Tong Xi ,&nbsp;Huabing Li ,&nbsp;Lili Tan ,&nbsp;Ke Yang","doi":"10.1016/j.ijplas.2024.104144","DOIUrl":"10.1016/j.ijplas.2024.104144","url":null,"abstract":"<div><div>For metallic materials, an increase in strength generally results in a decrease in plasticity, and the simultaneous improvement of strength and plasticity (SISP) has been a hot but difficult topic. In this study, through high-nitrogen (N) alloying, a novel high-N twinning-induced plasticity (HN-TWIP) steel was designed. It was surprisingly found that, with higher N content, the SISP was achieved successfully. Compared to 0.3 N, the ultimate tensile strength and uniform elongation of 0.6 N increased by 95 MPa and 5.6 %, respectively. Systematic microstructural analyses indicated that more and thinner twins formed at higher N content during the deformation. Especially, different with conventional TWIP (CV-TWIP) steels, numerous ultrafine nano-twins (&lt;15 nm) were detected in HN-TWIP steels. Combined with the flow stress analyses, their strengthening behavior was found to be attributed to both the N solid solution strengthening and nano-twin strengthening. More importantly, by promoting planar slip, the ultrafine nano-twins provided an additional work-hardening and delayed the necking appearance, which resulted in plasticity enhancement. In other words, the origin of the strength-ductility trade-off avoidance was the nano-twins/ultrafine nano-twins microstructure. Further studies revealed that, by breaking the conflict of low stacking fault energy (SFE) and excellent austenite stability, HN-TWIP steels obtained a breakthrough reduction in SFE. HN-TWIP steels with the extremely low SFE could acquire the special nano-twin microstructure and the SISP mechanical behavior. Accordingly, only by continuously reducing the SFE in the alloying design, the difficult SISP could be realized in TWIP steels. This is a novel and simple strategy for the modification of the metal mechanical properties, and it is meaningful for materials in engineering applications.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104144"},"PeriodicalIF":9.4,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142377703","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":"Plastic deformation and strengthening mechanisms in CoNiCrFe high entropy alloys: The role of lattice site occupancy","authors":"Prafull Pandey ,&nbsp;Nikhil Khatavkar ,&nbsp;Sarvesh Kumar ,&nbsp;Hyunseok Oh ,&nbsp;Akshat Godha ,&nbsp;Surendra K. Makineni ,&nbsp;Abhishek Singh ,&nbsp;Cemal Cem Tasan ,&nbsp;Kamanio Chattopadhyay","doi":"10.1016/j.ijplas.2024.104145","DOIUrl":"10.1016/j.ijplas.2024.104145","url":null,"abstract":"<div><div>The work herein presents the designing of two γʹ strengthened high entropy alloys guided by density function theory (DFT) and thermodynamics calculations with compositions Co₃₄Ni₃₄Cr₁₂Al₈Nb₃Ti₄Fe₅ and Co_31.5Ni_31.5Cr₁₂Al₈Nb₃Ti₄Fe₁₀ (referred as 5Fe and 10Fe). These alloys in the peak aged condition (900 °C for 20 h) exhibit similar precipitates sizes, shapes, volume fractions and γ/γʹ lattice misfit (∼ 0.56). Intriguingly, despite their microstructural similarities, these alloys show different trends in yield strength (YS) evolution over a temperature range. The 5Fe alloy shows a better combination of strength and ductility at room temperature (RT), with YS and elongation of 970 ± 25 MPa, ∼ 18 (%), respectively, in comparison to 850 ± 20 MPa, and ∼ 15(%) in the 10Fe alloy. The precipitate chemistry analyses carried out by 3D atom probe tomography suggest that Fe atoms occupy B-sites in the 5Fe alloy, while it occupies both A and B-sites in the 10Fe alloy. The site occupancy behaviour rendered a higher stacking fault energy (SFE) of the 5Fe alloy, making the γʹ shearing more difficult compared to the 10Fe alloy. The synchrotron X-ray measurements further confirm higher stacking fault (SF) probability in the γ matrix compared to γʹ precipitates in the 5Fe alloy. The role of deformation substructure evolution is also carefully discussed to explain the differences in the high temperature behavior. These results on the effects of alloying chemistry in high entropy alloys enable tuning the mechanical properties of alloys and widening the alloy spectrum with improved high-temperature properties.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104145"},"PeriodicalIF":9.4,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142377533","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":"Multiscale plastic deformation in additively manufactured FeCoCrNiMox high-entropy alloys to achieve strength–ductility synergy at elevated temperatures","authors":"Danyang Lin ,&nbsp;Jixu Hu ,&nbsp;Renhao Wu ,&nbsp;Yazhou Liu ,&nbsp;Xiaoqing Li ,&nbsp;Man Jae SaGong ,&nbsp;Caiwang Tan ,&nbsp;Xiaoguo Song ,&nbsp;Hyoung Seop Kim","doi":"10.1016/j.ijplas.2024.104142","DOIUrl":"10.1016/j.ijplas.2024.104142","url":null,"abstract":"<div><div>The application of structural metals in extreme environments necessitates materials with superior mechanical properties. Mo-doped FeCoCrNi high-entropy alloys (HEAs) have emerged as potential candidates for use in such demanding environments. This study investigates the high-temperature performance of FeCoCrNiMo<em>_x</em> HEAs with varying Mo contents (<em>x</em> = 0, 0.1, 0.3, and 0.5) prepared by laser powder bed fusion additive manufacturing. The mechanical properties were evaluated at room and 600 °C temperatures, and the microstructures were characterized using scanning electron microscopy, electron backscatter diffraction, energy dispersive X-ray spectroscopy, and transmission electron microscopy. The intrinsic dislocation cell patterning, solid-solution strengthening, nanoprecipitation, and twinning effects collectively modulated the plastic deformation behavior of the samples. The high-temperature mechanical performance was comprehensively analyzed in conjunction with <em>ab initio</em> calculations and molecular dynamics simulations to reveal the origin of the experimentally observed strength–ductility synergy of FeCoCrNiMo_0.3. This study has significant implications for FeCoCrNiMo<em>_x</em> HEAs and extends our understanding of the structural origins of the exceptional mechanical properties of additively manufactured HEAs.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104142"},"PeriodicalIF":9.4,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369544","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 3D finite deformation constitutive model for anisotropic shape memory polymer composites integrating viscoelasticity and phase transition concept","authors":"Chengjun Zeng ,&nbsp;Yunqiang Hu ,&nbsp;Liwu Liu ,&nbsp;Xiaozhou Xin ,&nbsp;Wei Zhao ,&nbsp;Yanju Liu ,&nbsp;Jinsong Leng","doi":"10.1016/j.ijplas.2024.104139","DOIUrl":"10.1016/j.ijplas.2024.104139","url":null,"abstract":"<div><div>The phase transition theory of shape memory polymers (SMPs) often involves a phenomenological assumption that the reference configuration of the newly transformed phase deviates from that of the initial phase. This distinction serves as a crucial mechanism in the manifestation of the shape memory effect. However, elucidating the precise definition of the reference configuration of the transformed phase poses a significant challenge in the formulation of the constitutive model. To tackle this challenge, a three-dimensional (3D) finite deformation constitutive model incorporating effective phase evolution for SMPs has been developed. This model merges insights from the classical viscoelastic framework with the phase transition theory. The anisotropic thermo-viscoelastic constitutive model is further developed by introducing hyperelastic fibers, which integrate the anisotropy of the fibers into a continuous thermodynamic framework through structure tensors. Implemented within the ABAQUS software via a user material (UMAT) subroutine, the proposed model has been meticulously validated against experimental data, showcasing its prowess in simulating stress-strain responses and shape memory characteristics of SMPs and their composites (SMPCs). This innovative model stands as an invaluable instrument for the design and of sophisticated SMP and SMPC structures.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104139"},"PeriodicalIF":9.4,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369579","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":"Achieving superior strength and ductility synergy in bulk ultrafine grained Al-Mg-Sc-Zr alloy via powder pre-aging","authors":"Mingxi Li ,&nbsp;Jiashuo Liu ,&nbsp;Ruixiao Zheng ,&nbsp;Guodong Li ,&nbsp;Maowen Liu ,&nbsp;Yuanyuan Lu ,&nbsp;Wenlong Xiao ,&nbsp;Chaoli Ma","doi":"10.1016/j.ijplas.2024.104143","DOIUrl":"10.1016/j.ijplas.2024.104143","url":null,"abstract":"<div><div>Introducing high density of nano-precipitates to recrystallized ultrafine grains is helpful to realize strength-ductility synergy but is a challenging task, because recrystallization and precipitate growth/coarsening usually concur. Here we develop a pre-aging powder metallurgy processing route to achieve such microstructure in Al-Mg-Sc-Zr alloy. During the pre-aging stage, atomic clusters including short-range order are formed within the grains, which provide new sites for the nucleation and enable the formation of fine Al₃(Sc, Zr) precipitates. Subsequent high-temperature sintering and hot extrusion lead to grain recrystallization. The nano-precipitates not only further strengthen the ultrafine-grained alloy by Orowan mechanism, but also greatly enhance the strain-hardening rate by dislocation-precipitate interaction, resulting in excellent strength-ductility synergy. The utilization of digital image correlation (DIC) analysis allows for the observation of dynamic strain aging during the tensile process, whereby the strain demonstrates a distinctive step-like transition coinciding with the passage of the Portevin-Le Chatelier (PLC) band. This work provides a new path for improving the mechanical properties of the same type of metallic materials.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"182 ","pages":"Article 104143"},"PeriodicalIF":9.4,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142369545","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}