International Journal of Plasticity最新文献_第2页

Atomic mechanisms for the fracture of AlMo0.5NbTa0.5TiZr refractory high entropy superalloy AlMo0.5NbTa0.5TiZr 难熔高熵超合金断裂的原子机制

IF 9.4 1区材料科学

International Journal of Plasticity Pub Date : 2024-11-09 DOI: 10.1016/j.ijplas.2024.104176

Fuhua Cao , Hongyi Li , Yan Chen , Haiying Wang , Zheng Peng , Lan-Hong Dai

{"title":"Atomic mechanisms for the fracture of AlMo0.5NbTa0.5TiZr refractory high entropy superalloy","authors":"Fuhua Cao , Hongyi Li , Yan Chen , Haiying Wang , Zheng Peng , Lan-Hong Dai","doi":"10.1016/j.ijplas.2024.104176","DOIUrl":"10.1016/j.ijplas.2024.104176","url":null,"abstract":"<div><div>Refractory high entropy superalloys (RHESs), known for their excellent high temperature performance, exhibit promising characteristics but are challenged by significant brittleness. Efforts to enhance plasticity through microstructure regulation have achieved only limited success, largely due to the unclear underlying fracture mechanisms of the superstructure. In this study, we systematically investigate the fracture mechanisms of the AlMo<sub>0.5</sub>NbTa<sub>0.5</sub>TiZr RHES from microscopic to electronic scales. Interestingly, both experimental and simulation results reveal that the ordered B2 phase demonstrates non-negligible plastic deformation capabilities during fracture, including deformation twinning and amorphization. Despite this, the fracture resistance of the B2 phase is lower compared to the A2/B2 interface and disordered A2 phase, even though the A2 phase shows less twinning and amorphization. Ab initio molecular dynamics simulations, combined with electronic behavior analysis, indicate that bonds involving Al and Zr in the B2 phase often exist in an anti-bonding state, making them more prone to breaking under load. This study provides deeper insights into the fracture mechanisms of the A2/B2 superstructure and its constituent phases at both atomic and electronic levels, offering a systematic approach to improving the fracture properties of such RHESs.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104176"},"PeriodicalIF":9.4,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597041","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}

引用次数: 0

Hierarchical Deformation and Anisotropic Behavior of (α+β) Ti Alloys: A Microstructure-Informed Multiscale Constitutive Model Study (α+β) Ti 合金的分层变形和各向异性行为：基于微观结构的多尺度构造模型研究

IF 9.8 1区材料科学

International Journal of Plasticity Pub Date : 2024-11-08 DOI: 10.1016/j.ijplas.2024.104163

C. Herath, K. Wijesinghe, J.G. Michopoulos, S.M. Arnold, A. Achuthan

{"title":"Hierarchical Deformation and Anisotropic Behavior of (α+β) Ti Alloys: A Microstructure-Informed Multiscale Constitutive Model Study","authors":"C. Herath, K. Wijesinghe, J.G. Michopoulos, S.M. Arnold, A. Achuthan","doi":"10.1016/j.ijplas.2024.104163","DOIUrl":"https://doi.org/10.1016/j.ijplas.2024.104163","url":null,"abstract":"In this study, the hierarchical deformation and anisotropic behavior of (α+β) Ti alloys are investigated using a novel microstructure-informed multiscale constitutive model. State-of-the-art crystal plasticity finite element (CPFE) models, due to their emphasis on a single length scale, are inadequate for capturing the complex hierarchical behavior of additively manufactured (AM) (α+β) titanium alloys, which are characterized by columnar grains and lamellar subgrain features at distinct length scales. To overcome this limitation, a decoupled multiscale framework was developed, integrating representative volume elements (RVEs) for both the columnar grain structure at the higher length scale and the subgrain microstructure at the lower length scale, with equal emphasis on each. The material behaviors at these scales were modeled using an anisotropic classical plasticity model and a mechanism-based CPFE model, respectively. The framework was experimentally validated for Directed Energy Deposition (DED) manufactured Ti-6Al-4V and used to investigate microscopic stress/strain fields, deformation localizations at grain and subgrain levels, and stress partitioning among neighboring grains. Insights from these studies led to the proposal of a new theory of anisotropy in AM (α+β) titanium alloys.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"1 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597106","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}

引用次数: 0

Achieving high strength and ductility of titanium matrix composite reinforced with networked TiB via SPS sintering of core-shell powder and accumulative hot rolling 通过核壳粉末的 SPS 烧结和累积热轧实现网络化 TiB 增强钛基复合材料的高强度和延展性

IF 9.8 1区材料科学

International Journal of Plasticity Pub Date : 2024-11-06 DOI: 10.1016/j.ijplas.2024.104166

Guo-Dong Sun, Jun-Jie Cheng, Ze-Kun Zheng, Jing-Li Zhang, Xu-Wen Su, Peng-Fei Zhang, Ming-Jia Li, Jun-Jie Xu, Xiao-Qi Mao, Long-Long Dong, Ming-Yang Li

{"title":"Achieving high strength and ductility of titanium matrix composite reinforced with networked TiB via SPS sintering of core-shell powder and accumulative hot rolling","authors":"Guo-Dong Sun, Jun-Jie Cheng, Ze-Kun Zheng, Jing-Li Zhang, Xu-Wen Su, Peng-Fei Zhang, Ming-Jia Li, Jun-Jie Xu, Xiao-Qi Mao, Long-Long Dong, Ming-Yang Li","doi":"10.1016/j.ijplas.2024.104166","DOIUrl":"https://doi.org/10.1016/j.ijplas.2024.104166","url":null,"abstract":"The enhancement of strength and ductility of titanium matrix composites (TMCs) is crucial for lightweighting and expanding their advanced engineering applications. However, it is still a challenge for TMCs to achieve ultrahigh tensile strength with suitable ductility. In this study, a special low-temperature accumulative hot rolling (AHR) process was proposed to regulate the grain/phase boundaries and dislocation structures of TMCs reinforced with networked TiB. Through the AHR process, we have achieved exceptionally tensile strength and yield strength of 1570 MPa and 1460 MPa, respectively, accompanied with a suitable ductility of ∼7.5%. During the AHRed process, the majority of α-Ti grains rotated towards the favorable orientations, which display high SFs for basal slip in ND and prismatic slip in RD, respectively, resulting in the formation of {0002} texture. The accumulation and recovery of dislocations led to the formation of high-density sub-grain boundaries and geometrically necessary dislocations (GNDs) within α-Ti grains. Specifically, the GNDs rose dramatically from 1.06 × 10<sup>14</sup> m<sup>−2</sup> to 8.16 × 10<sup>14</sup> m<sup>−2</sup>, whereas the size of α-Ti grains decreased significantly from 6.8 to 1.1 μm. In the β phase grains, secondary phase transformation was induced via the AHR process, resulting in the introduction of high-density nano-scaled secondary α-Ti lamellae (∼4 nm) with a fully coherent interface {110}<sub>BCC</sub>//{0002}<sub>HCP</sub>. After the AHR process, the crack nucleation and prolongation along the networked TiB was inhibited, resulting in the enhancement of ductility. This special AHR strategy, combining grain/hetero-phase boundary engineering and dislocation engineering, has great potential and universality for designing TMCs with both ultrahigh strength and suitable ductility.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"1 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142588394","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}

引用次数: 0

Characterization of compressive fracture strain based on bilinear strain paths 基于双线性应变路径的压缩断裂应变表征

IF 9.4 1区材料科学

International Journal of Plasticity Pub Date : 2024-11-06 DOI: 10.1016/j.ijplas.2024.104168

Kwanghyun Yu , Jeong Whan Yoon

{"title":"Characterization of compressive fracture strain based on bilinear strain paths","authors":"Kwanghyun Yu , Jeong Whan Yoon","doi":"10.1016/j.ijplas.2024.104168","DOIUrl":"10.1016/j.ijplas.2024.104168","url":null,"abstract":"<div><div>This study proposes the compressive fracture characterization method using bilinear strain paths: pre-tension and compression. Compressive ductile fracture exhibits extremely large strain, which has been regarded as being difficult to be measured. Large deformation under compressive loading makes the shape of a specimen barreled and changes the stress triaxiality rapidly. Due to these complicated and large strains, compressive fracture strain can be considered to be within the so-called cut-off region where no fracture occurs. In order to enable compression tests to be easier, an approach that can lower the range of fracture strain is needed. Uniaxial tensile deformation is a strain path that induces the growth of voids inside ductile materials and leads to ductility reduction. Ductile materials subjected to pre-tensile loading before compressive loading can show the premature compressive fracture. A ductile fracture model capable of predicting the cut-off region is selected for ductile fracture loci of the bilinear strain paths and implemented into the numerical simulation with different pre-tensile strain levels. The verification of the proposed characterization method is performed by comparing experimental data and simulation results for fractured specimen shapes and load-displacement curves.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104168"},"PeriodicalIF":9.4,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142594299","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}

引用次数: 0

Influence of grain size on strain-induced phase transformation in a CrCoNi multi-principal element alloy 晶粒尺寸对铬钴镍多主元合金中应变诱导相变的影响

IF 9.4 1区材料科学

International Journal of Plasticity Pub Date : 2024-11-06 DOI: 10.1016/j.ijplas.2024.104164

Gustavo Bertoli , Amy J. Clarke , Michael J. Kaufman , Claudio S. Kiminami , Francisco G. Coury

{"title":"Influence of grain size on strain-induced phase transformation in a CrCoNi multi-principal element alloy","authors":"Gustavo Bertoli , Amy J. Clarke , Michael J. Kaufman , Claudio S. Kiminami , Francisco G. Coury","doi":"10.1016/j.ijplas.2024.104164","DOIUrl":"10.1016/j.ijplas.2024.104164","url":null,"abstract":"<div><div>A Cr<sub>40</sub>Co<sub>40</sub>Ni<sub>20</sub> (at.%) alloy with different grain/crystallite sizes was analyzed through <em>in-situ</em> synchrotron X-ray diffraction during tensile testing. The FCC starting structure underwent a partial strain-induced transformation to HCP (TRIP effect) and the percent transformed was measured throughout the deformation. The critical stress required to form a certain HCP fraction was shown to follow a Hall-Petch relation (<em>σ<sub>TRIP</sub> = σ<sub>TRIP,</sub></em><sub>0</sub> <em>+ k<sub>TRIP</sub>d<sup>-0.5</sup></em>), with the Hall-Petch slope being approximately the same for yield stress and TRIP effect (<em>k<sub>y</sub></em> ≈ <em>k<sub>TRIP</sub></em>). Furthermore, this work developed a Hall-Petch-based model that correlates the applied stress, the transformed phase fraction, and the initial FCC grain/crystallite size. It predicts the stress required to form a certain HCP fraction, or the fraction formed when a certain stress is applied, for different grain/crystallite sizes. We also proposed a mechanism to explain the grain/crystallite size dependence of the TRIP effect and discuss how the TRIP effect and its early activation in the Cr<sub>40</sub>Co<sub>40</sub>Ni<sub>20</sub> alloy provide high work-hardening capacity, which improves ductility and toughness. Here, a refined FCC grain size (<em>d</em> = 1.3; <em>c</em> = 0.7 μm) was shown to increase the yield stress by at least 100 % (417 → 834 MPa), compared to a coarser grain material (17; 6.8 μm), while maintaining a high ductility of 41 %. This work contributes to a better understanding of the deformation mechanisms, mainly the strain-induced phase transformation (TRIP), highlighting their impact and importance on mechanical properties.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104164"},"PeriodicalIF":9.4,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142588398","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}

引用次数: 0

Towards extraordinary strength-ductility synergy in pure Mg via dislocation transmutation 通过位错嬗变实现纯镁的超常强度-电导率协同效应

IF 9.4 1区材料科学

International Journal of Plasticity Pub Date : 2024-11-05 DOI: 10.1016/j.ijplas.2024.104160

Liuyong He , Jiang Zheng , Mengning Xu , Tianjiao Li , Dongdi Yin , Bin Jiang , Fusheng Pan , Hao Zhou

{"title":"Towards extraordinary strength-ductility synergy in pure Mg via dislocation transmutation","authors":"Liuyong He , Jiang Zheng , Mengning Xu , Tianjiao Li , Dongdi Yin , Bin Jiang , Fusheng Pan , Hao Zhou","doi":"10.1016/j.ijplas.2024.104160","DOIUrl":"10.1016/j.ijplas.2024.104160","url":null,"abstract":"<div><div>Navigating the strength-ductility trade-off has been a persistent challenge in Mg alloys. Here, we address this issue through a novel multiple-direction pre-deformation at room temperature that introduces a high density of 〈<em>c</em> + <em>a</em>〉 dislocations into pure Mg via dislocation transmutation. This approach achieves a remarkable enhancement in the strength-ductility synergy, increasing the yield strength from 87.6 MPa to 156.6 MPa and improving elongation to failure from 7.7% to 17.6%. In general, introducing a high-density 〈<em>c</em> + <em>a</em>〉 dislocations in Mg alloys have been difficult due to the high CRSS at room temperature. Our findings reveal that extension twinning can act as a “dislocation converter,” transforming basal 〈a〉 dislocations in the matrix into 〈<em>c</em> + <em>a</em>〉 dislocations within twins. Intensive basal 〈a〉 dislocations were induced in pure Mg through pre-tension and subsequently transformed into 〈<em>c</em> + <em>a</em>〉 dislocations via extension twinning during compression. This process led to a substantial number of 〈<em>c</em> + <em>a</em>〉 dislocations and I<sub>1</sub> stacking faults, contributing to the enhanced strength. The high density of 〈<em>c</em> + <em>a</em>〉 dislocations, combined with I<sub>1</sub> stacking faults and a reduced c/a ratio within twins, enhances the activity of pyramidal 〈<em>c</em> + <em>a</em>〉 slip, thereby significantly improving ductility. This dislocation transmutation strategy offers a promising way for producing strength-ductility synergy in Mg alloys.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104160"},"PeriodicalIF":9.4,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142580559","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}

引用次数: 0

Exceptional tensile ductility and strength of a BCC structure CLAM steel with lamellar grains at 77 kelvin 具有片状晶粒的 BCC 结构 CLAM 钢在 77 开尔文条件下的优异拉伸延展性和强度

IF 9.4 1区材料科学

International Journal of Plasticity Pub Date : 2024-11-04 DOI: 10.1016/j.ijplas.2024.104161

Jinhua Zhou , Jing Wang , Jungang Ren , Robert O. Ritchie , Zuncheng Wang , Yuchao Wu , Zhufeng He , Xin Wang , Ying Fu , Yifu Jiang , Lin Wang , Xiaowei Yin

{"title":"Exceptional tensile ductility and strength of a BCC structure CLAM steel with lamellar grains at 77 kelvin","authors":"Jinhua Zhou , Jing Wang , Jungang Ren , Robert O. Ritchie , Zuncheng Wang , Yuchao Wu , Zhufeng He , Xin Wang , Ying Fu , Yifu Jiang , Lin Wang , Xiaowei Yin","doi":"10.1016/j.ijplas.2024.104161","DOIUrl":"10.1016/j.ijplas.2024.104161","url":null,"abstract":"<div><div>The low-temperature tensile brittleness of body-centered cubic (BCC) metals and alloys can seriously compromise their service applications. In this study, we prepared a BCC structured China low activation martensitic steel (CLAM) steel with lamellar grains by regulating the rolling and heat-treatment processes, successfully reversing the decreasing trend of ductility in the steel with decrease in temperature. Compared with current face-centered cubic (FCC) structural steels and high-entropy alloys, the lamellar grained CLAM steel exhibits an excellent synergy of strength and ductility at 77K, but with lower raw material costs. The superior low temperature ductility of the lamellar grained steel can be attributed to an increase in grain strength at low temperatures which promotes the propagation of layered tearing cracks; this in turn leads to a significant increase in the necking area of the steel, thereby compensating for the decrease in ductility. We conclude that our lamellar grain structures can be utilized to significantly enhance the low-temperature tensile ductility of BCC metals and alloys, thereby expanding their service range to cryogenic temperatures.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104161"},"PeriodicalIF":9.4,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579901","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}

引用次数: 0

Deformation mechanism of a metastable medium entropy alloy strengthened by the synergy of heterostructure design and cryo-pre-straining 通过异质结构设计和低温预拉伸的协同作用强化可蜕变中等熵合金的变形机制

IF 9.4 1区材料科学

International Journal of Plasticity Pub Date : 2024-11-04 DOI: 10.1016/j.ijplas.2024.104162

Shilei Liu , Haitao Gao , Daixiu Wei , Charlie Kong , L.S.R. Kumara , M.W. Fu , Hailiang Yu

{"title":"Deformation mechanism of a metastable medium entropy alloy strengthened by the synergy of heterostructure design and cryo-pre-straining","authors":"Shilei Liu , Haitao Gao , Daixiu Wei , Charlie Kong , L.S.R. Kumara , M.W. Fu , Hailiang Yu","doi":"10.1016/j.ijplas.2024.104162","DOIUrl":"10.1016/j.ijplas.2024.104162","url":null,"abstract":"<div><div>Face-centered cubic (FCC) medium entropy alloys (MEAs) have received considerable attention due to their impressive mechanical properties and responses. However, their practical application is limited by their modest yield strengths. The potential enhancement of the mechanical properties of single-phase MEAs was explored in this study through a synergistic approach combining heterogeneous structure design with subsequent cryo-pre-straining. A heterogeneous lamella structure was produced in a single-phase Fe<sub>55</sub>Mn<sub>20</sub>Cr<sub>15</sub>Ni<sub>10</sub> MEA via two-step rolling and annealing. Cryo-pre-straining at varying degrees (6, 12, 21, and 36%) introduced hexagonal close-packed (HCP) phase, high-density dislocations, twins, and stacking faults, leveraging the reduced stacking fault energy at cryogenic temperatures. This process enhanced the alloy's yield strength from 353 MPa to 1.2 GPa (compared to the baseline uniform coarse-grained structure), while maintaining an acceptable total elongation of 8.4%. The impact of cryo-pre-straining on the microstructure and mechanical properties of the MEA was assessed using <em>in</em>-<em>situ</em> synchrotron X-ray diffraction analysis. Cryo-pre-straining (36%) achieved a higher dislocation density (6.1 × 10<sup>15</sup> <em>m</em><sup>−2</sup>) compared to room-temperature straining (2.5 × 10<sup>15</sup> <em>m</em><sup>−2</sup>). The stress contribution from HCP-martensite and the evolution of dislocation density during loading were quantified, along with observations of negative stacking fault probability and strain-induced HCP→FCC reverse transformation in cryo-pre-strained samples under loading conditions. Furthermore, the contributions of regulated microstructures to the enhancement of yield strength were quantitatively assessed.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104162"},"PeriodicalIF":9.4,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579902","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}

引用次数: 0

Dynamic deformation and fracture of brass: Experiments and dislocation-based model 黄铜的动态变形和断裂：实验和基于位错的模型

IF 9.4 1区材料科学

International Journal of Plasticity Pub Date : 2024-11-02 DOI: 10.1016/j.ijplas.2024.104165

E.S. Rodionov, V.V. Pogorelko, V.G. Lupanov, A.G. Fazlitdinova, P.N. Mayer, A.E. Mayer

{"title":"Dynamic deformation and fracture of brass: Experiments and dislocation-based model","authors":"E.S. Rodionov, V.V. Pogorelko, V.G. Lupanov, A.G. Fazlitdinova, P.N. Mayer, A.E. Mayer","doi":"10.1016/j.ijplas.2024.104165","DOIUrl":"10.1016/j.ijplas.2024.104165","url":null,"abstract":"<div><div>In this work, we perform a comprehensive study of the dynamic deformation and fracture of brass, including Taylor tests with classical and profiled cylinders and ball throwing experiments reaching the strain rates of about (0.1−1)/μs, as well as atomistic and continuum-level numerical modeling. Molecular dynamics (MD) simulations are used to construct the equation of state (EOS) of brass and to study its fracture characteristics at shear deformation under negative pressure. An original model of fracture under combined tensile-shear loading is formulated, which takes into account both the accumulation of empty volume in the process of lattice loosening due to the lattice defect production in the course of plastic deformation and further mechanical growth of voids controlled by the dislocation plasticity. This atomic-scale model is transmitted to the macroscopic experiment-scale level and embedded into 3D dislocation plasticity model to describe the dynamic deformation and fracture of brass using the numerical scheme of smoothed particle hydrodynamics (SPH). A part of experimental data is used to find the optimal parameters of the dislocation plasticity model by means of the Bayesian global optimization method accelerated with the help of artificial-neural-network (ANN)-based emulator of the 3D model. Another part of experimental data is used to fit the fracture model parameter. The remaining experimental data, which are not used in the parameterization, are applied to verify the parameterized model. The developed physical-based model provides correct and meaningful description of the dynamic deformation and fracture of brass, while the developed formalized approach to its parameterization opens a way to wider use of this type of models in the engineering applications, including studies on dynamic performance and high-speed processing technologies.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 ","pages":"Article 104165"},"PeriodicalIF":9.4,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142563076","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}

引用次数: 0

Understanding Stacking Fault Tetrahedron Formation in FCC Stainless Steel: A Fusion of Transmission Electron Microscopy, Molecular Dynamics, and Machine Learning 了解催化裂化不锈钢中堆积断层四面体的形成：透射电子显微镜、分子动力学和机器学习的融合

IF 9.8 1区材料科学

International Journal of Plasticity Pub Date : 2024-10-31 DOI: 10.1016/j.ijplas.2024.104157

Pan-Dong Lin, Jun-Feng Nie, Wen-Dong Cui, Lei He, Shu-Gang Cui, Guo-Chao Gu, Gui-Yong Xiao, Yu-Peng Lu

{"title":"Understanding Stacking Fault Tetrahedron Formation in FCC Stainless Steel: A Fusion of Transmission Electron Microscopy, Molecular Dynamics, and Machine Learning","authors":"Pan-Dong Lin, Jun-Feng Nie, Wen-Dong Cui, Lei He, Shu-Gang Cui, Guo-Chao Gu, Gui-Yong Xiao, Yu-Peng Lu","doi":"10.1016/j.ijplas.2024.104157","DOIUrl":"https://doi.org/10.1016/j.ijplas.2024.104157","url":null,"abstract":"The stacking fault tetrahedron (SFT) formation displays a pronounced size effect, progressing from vacancy equilateral triangular plate to perfect SFT, and eventually to truncated SFT, as demonstrated in numerous irradiated face-centered cubic metals. However, the presence of distinct SFT structures in F321 stainless steel has not been reported. This study explored the SFT formation mechanism in irradiated F321 stainless steel using transmission electron microscopy (TEM), molecular dynamics (MD) simulations, and machine learning. SFTs, Frank loops, and Lomer-Cottrell locks were found to be widely generated in the irradiated F321 steel. The critical size for truncated and perfect SFTs was determined using MD simulations; the results were consistent with the theoretical predictions. Additionally, the twin boundaries observed through TEM, which were attributed to the elevated tensile stress near the boundaries, facilitated the formation of perfect SFTs. Moreover, interstitial Frank loops also facilitated the formation of perfect SFTs. This study also explored the influence of variations in Ni and Cr concentrations on the critical size <em>n<sub>1</sub></em> for the transition from vacancy plates to perfect SFTs and <em>n<sub>2</sub></em> for the transition from perfect SFTs to truncated SFTs, using a combination of MD and machine learning methods. As the Ni concentration increased and the Cr concentration decreased, <em>n<sub>1</sub></em> and <em>n<sub>2</sub></em> increased; conversely, the critical sizes decreased when the Ni concentration decreased and the Cr concentration increased. These insights reveal the systematic mechanism of SFT formation under varied conditions, offering new perspectives for understanding the nano-defects in F321 stainless steel.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"41 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142542092","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}

引用次数: 0