Journal of Magnesium and Alloys最新文献

{"title":"Texture traits and mechanical anisotropy of AZ31 magnesium alloy sheet by hard plate cross rolling","authors":"Jia Yang Zhang, Feng Li, Lu Sun, Wen Tao Niu, Mu Zi Cao","doi":"10.1016/j.jma.2025.01.004","DOIUrl":"https://doi.org/10.1016/j.jma.2025.01.004","url":null,"abstract":"Conventional cross rolling is influenced by the force couple effect of symmetrical rollers, resulting in the c-axis of the plate grains being oriented perpendicular to the rolling surface. This orientation contributes to a high degree of work hardening and mechanical anisotropy, thereby complicating subsequent processing. In this study, the hard plate cross rolling (HP-CR) process is put forward for the first time, and the microstructure evolution and mechanical properties of rolled AZ31 Magnesium plate were analyzed. The results indicate that, in comparison to traditional cross rolling (CR), the average grain size of the HP-CR is refined to 5.33 µm. Additionally, the average yield strength and elongation of the sheet are enhanced by 15.2 % and 35.2 %, respectively, while the average tensile strength is 283 MPa, and the r value decreases by 39.8 %. These changes are attributed to the combined effects of grain refinement, microstructural homogenization, and basal texture weakening. On the one hand, the substantial energy stored in the original lattice distortion serves as a driving force for the dynamic recrystallization process, facilitating the elimination of the deformed grain structure. This process increases the proportion of recrystallized grains from 5 % to 82 %, reduces the degree of work hardening, and correspondingly decreases the density of geometrically necessary dislocations (ρ^GND) by 70.8 %, accompanied by the formation of high-angle grain boundaries (HAGB). On the other hand, dynamic recrystallization promotes grain rearrangement, resulting in an increased number of grains oriented in the transverse direction (TD), which diminishes the texture strength of the basal plane. Concurrently, the activation of non-basal slip systems reduces the resistance to dislocation sliding in various directions, significantly reduces the degree of mechanical anisotropy and enhancing the plastic deformation capacity of the plate. This research provides valuable scientific insights and technical foundations for the large-scale manufacturing of high-performance AZ31 magnesium alloy sheets.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"21 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057071","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":"Mechanism of mechanical properties enhancement in laser- arc hybrid additive manufacturing of Mg-Gd-Y-Zr alloy based on nano precipitated phase","authors":"Changrong Ge, Zhendong Shen, Dehua Liu, Guojiang Dong, Fangyong Niu, Dongjiang Wu, Guangyi Ma","doi":"10.1016/j.jma.2025.01.002","DOIUrl":"https://doi.org/10.1016/j.jma.2025.01.002","url":null,"abstract":"In order to address the urgent demand for lightweight components in the aerospace, a laser-arc hybrid additive manufacturing (LAHAM) is innovatively applied to the Mg-Gd-Y-Zr alloy in this study. The results show that compared with wire arc additive manufacturing (WAAM), the grain size and texture strength of LAHAM were reduced by about 26 % and 27 % respectively. The β phase at grain boundaries are effectively mitigated. In LAHAM, the nanoscale β phase (Mg₂₄(Gd,Y)₅ + Mg₅(Gd,Y)) and β₁ phase (Mg₃(Gd,Y)) were uniformly distributed in the grain boundary. There were only nanoscale β phase distributed around the enriched second phase in WAAM. The size and type of nanoparticles directly affect the mechanical properties of alloys. The tensile strength and yield strength of WAAM specimen were about 228 MPa, 152 MPa. Compared with WAAM, the tensile strength and yield strength of LAHAM were increased by about 12 % and 15 %, reaching 254 MPa and 175 MPa. The contribution of precipitation strengthening is about 42 %. This study provides a new perspective for the systematic application and fabrication of Mg-Gd-Y-Zr alloy.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"53 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057070","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":"Enhanced plasticity mediated by disclination-assisted accommodation and twinning-induced work hardening in an elliptical-textured Mg alloy","authors":"Zhangting Hu, Yipeng Gao, Yizhen Li, Zhen-Ming Hua, Chunfeng Du, Min Zha, Hui-Yuan Wang","doi":"10.1016/j.jma.2025.01.010","DOIUrl":"https://doi.org/10.1016/j.jma.2025.01.010","url":null,"abstract":"Crystallographic texture engineering is a key strategy for enhancing the mechanical properties of polycrystalline magnesium (Mg) alloys. Due to the intrinsic anisotropy of the hexagonal close-packed (HCP) structure, the deformation behavior of Mg alloys is significantly governed by individual grain deformation and multi-grain interactions, both dictated by crystallographic texture. In the current study, enhanced ductility was achieved in a Mg-Al-Zn-Mn dilute alloy by tailoring a strong basal texture into a transverse-direction-spread elliptical texture through the minor addition of yttrium (Y). Systematic <em>quasi-in-situ</em> electron backscatter diffraction (EBSD) and dislocation/disclination density analyses were performed to examine the microstructural evolution during deformation. We found that disclinations emerge from defect reactions, including dislocation-grain boundary (GB) and twin-GB interactions, which facilitate twinning plasticity and intergranular accommodation in the elliptical-textured alloy, resulting in improved work-hardening capacity and higher ductility (28.5 % along the rolling direction and 32.2 % along the transverse direction). By introducing disclination analysis to elucidate defect reactions, multi-grain interactions and the associated microstructure-property relationships in polycrystalline metals, our work provides new insights into the design of advanced Mg alloys with enhanced ductility and formability through crystallographic texture engineering.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"132 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057072","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":"TiCrNb hydride fabricated by melt spinning as the efficient catalyst for enhancing the hydrogen storage properties of MgH2","authors":"Houqun Xiao, Luocai Yi, Huxu Lei, Yu Xu, Xiaoxuan Zhang, Huazhou Hu, Ruizhu Tang, Qian Li, Qingjun Chen","doi":"10.1016/j.jma.2025.01.005","DOIUrl":"https://doi.org/10.1016/j.jma.2025.01.005","url":null,"abstract":"Magnesium hydride (MgH₂) has garnered significant attention as a promising material for high-capacity hydrogen storage. However, its commercial application remains challenging due to the high operating temperature and slow reaction kinetics. In this study, melt-spun Ti₄₅Cr₄₀Nb₁₅ (with a BCC phase) hydride (designated as TiCrNbH_x−MS) was synthesized and used to form a nano-multiphase composite to improve the de-/rehydrogenation properties of MgH₂ through ball milling. The incorporation of TiCrNbH_x−MS was shown to significantly enhance the hydrogen de-/rehydrogenation properties of MgH₂. The MgH₂ + 20 wt% TiCrNbH_x−MS composite exhibits an appealing initial dehydrogenation temperature of 163 °C and can absorb hydrogen at room temperature. Notably, it releases 5.8 wt% hydrogen in 700 s at 230 °C and recharges 4.3 wt% hydrogen in just 2 mins at 150 °C. Even after 100 cycles, it retains a reversible hydrogen capacity of 4.98 wt%. Kinetic analysis revealed that the dehydrogenation rate follows the Chou surface penetration model. Microstructural analysis showed that the FCC phase of the melt-spun TiCrNbH_x−MS hydride reversibly transformed into the BCC phase during the de-/rehydrogenation process in the composite. Numerous phase interfaces were generated and uniformly dispersed on the MgH₂ surface, providing additional hydrogen diffusion pathways and heterogeneous nucleation sites for Mg/MgH₂, thereby further improving the hydrogen de-/rehydrogenation kinetics of the system. This study offers valuable insights into the use of multiphase composites to enhance MgH₂ performance.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"60 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057138","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":"Influence of pre-torsion and low-temperature aging on ZK60 magnesium alloy","authors":"Jiaqi Hu, Xinyue Liang, Weishuai Shi, Hong Gao","doi":"10.1016/j.jma.2025.01.001","DOIUrl":"https://doi.org/10.1016/j.jma.2025.01.001","url":null,"abstract":"Magnesium alloys are widely used in aerospace and automotive industries due to their lightweight. However, their poor fatigue performance limits the broader application, especially in dynamic stress environments. This study explores novel coupled pretreatments of free-end large-angle pre-torsion and low-temperature aging to improve the fatigue resistance of rolled ZK60 magnesium alloy. STA (pre-torsion followed by low-temperature aging) and SAT (low-temperature aging followed by pre-torsion) samples were prepared to investigate the influences of pretreatment coupling sequences. The results of microstructure characterization reveal that pre-torsion significantly enhances the formation of tensile twins and introduces a gradient microstructure with increased dislocation density from the center to the edges. STA process resulted in the highest twinning area fraction of 35.2 % and a kernel average misorientation of 0.94 at the edge. Mechanical testing demonstrated that the coupled pre-treatment obtained a better combination of strength and plasticity, significantly improved the yield strength in the compression stage, and increased the tensile-compressive yield ratio to &gt;0.9. In the low-cycle fatigue test, the STA samples exhibited lower cyclic mean stress, a smaller cyclic hardening trend, and better hysteretic symmetry, leading to an improvement in fatigue life of up to 256 %. The findings suggest that the combined pre-torsion and low-temperature aging treatments offer a promising approach to enhance the mechanical properties and fatigue resistance of ZK60 magnesium alloy, making it suitable for structural applications in demanding environments.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"28 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057069","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":"Direct bonding of AZ31B and ZrO2 induced by interfacial sono-oxidation reaction at a low temperature","authors":"Z.L. Li, J. Wang, S.L. Yi, X.G. Song, J.H. Fu, Y. Shi, J.C. Feng","doi":"10.1016/j.jma.2024.12.013","DOIUrl":"https://doi.org/10.1016/j.jma.2024.12.013","url":null,"abstract":"Recently, the presentation of the metal-ceramic composite structure design provides an alternative idea for the improvement of components service performance, while conventional methods for joining metals and ceramics have to involve a high heat input. However, due to the low melting point of magnesium alloys, the magnesium alloys-ceramics joining system necessitates a low joining temperature. Ultrasonic vibrations can induce numerous defects in the solid matrix, which can effectively promote atomic diffusion and metallurgical bonding between solid-phase interfaces at low temperatures. Thus, ultrasonic-assisted bonding is a highly promising method for achieving rapid and reliable joining between metals and ceramics without the use of interlayers. In this study, the direct bonding of AZ31B alloy with ZrO₂ ceramic was successfully achieved at 200 °C. A polycrystal spinel MgAl₂O₄ with an average thickness of 55 nm was identified at the AZ31B/ZrO₂ interface. The average shear strength of joints reached 30.47 MPa. Furthermore, the dynamic recrystallization of AZ31B and the oxygen-depletion behavior of ZrO₂ during the bonding process were characterized to illustrate the contribution of ultrasonic vibration to joint bonding. Consequently, the solid interfacial sono-oxidation reaction is proposed to discuss the bonding mechanism of the joint in detail.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"45 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992179","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":"From macro-, through meso- to micro-scale: Densification behavior, deformation response and microstructural evolution of selective laser melted Mg-RE alloy","authors":"Cheng Chang, Guangrui Yao, Sophie C. Cox, Xiaofeng Zhang, Liyuan Sheng, Min Liu, Weili Cheng, Yang Lu, Xingchen Yan","doi":"10.1016/j.jma.2024.12.018","DOIUrl":"https://doi.org/10.1016/j.jma.2024.12.018","url":null,"abstract":"To clarify the densification behavior, deformation response and strengthening mechanisms of selective laser melted (SLM) Mg-RE alloys, this study systematically investigates a representative WE43 alloy via advanced material characterization techniques. A suitable laser output mode fell into the transition mode, allowing for the fabrication of nearly full-density samples (porosity = 0.85 ± 0.021 %) with favorable mechanical properties (yield strength=351 MPa, ultimate tensile strength = 417 MPa, the elongation at break = 6.5 % and microhardness = 137.9 ± 6.15 HV&lt;sub&gt;0.1&lt;/sub&gt;) using optimal processing parameters (&lt;em&gt;P&lt;/em&gt; = 80 W, &lt;em&gt;v&lt;/em&gt; = 250 mm/s and &lt;em&gt;d&lt;/em&gt; = 50 µm). Viscoplastic self-consistent analysis and transmission electron microscopy observations reveal that the plastic deformation response of the SLM Mg-RE alloys is primarily driven by basal &lt;&lt;em&gt;a&lt;/em&gt;&gt; and prismatic &lt;&lt;em&gt;a&lt;/em&gt;&gt; slips. Starting from a random texture before deformation (maximum multiple of ultimate density, Max. MUD = 3.95), plastic stretching led the grains to align with the Z-axis, finally resulting in a {0001}&lt;&lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;&amp;#xAF;&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"2.202ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -846.5 2072 947.9\" width=\"4.812ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMAIN-31\"&gt;&lt;/use&gt;&lt;use x=\"500\" xlink:href=\"#MJMAIN-30\" y=\"0\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(1001,0)\"&gt;&lt;g is=\"true\" transform=\"translate(35,0)\"&gt;&lt;use xlink:href=\"#MJMAIN-31\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(0,198)\"&gt;&lt;use x=\"-70\" xlink:href=\"#MJMAIN-AF\" y=\"0\"&gt;&lt;/use&gt;&lt;use x=\"70\" xlink:href=\"#MJMAIN-AF\" y=\"0\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(1571,0)\"&gt;&lt;use xlink:href=\"#MJMAIN-30\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;&gt; texture orientation after fracture (Max. MUD = 8.755). Main phases of the SLM state are mainly composed of α-Mg, Mg&lt;sub&gt;24&lt;/sub&gt;Y&lt;sub&gt;5&lt;/sub&gt; and β’-Mg&lt;sub&gt;41&lt;/sub&gt;Nd&lt;sub&gt;5&lt;/sub&gt;, with an average grain size of only 4.27 ","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"8 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142988553","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":"Degradation characteristics of high-purity magnesium implants under single static and cyclic compressive loads in vivo and in vitro","authors":"Long Guo, Xuanbin Zhang, Zhishan Zhang, Zhixiu Hao","doi":"10.1016/j.jma.2024.12.014","DOIUrl":"https://doi.org/10.1016/j.jma.2024.12.014","url":null,"abstract":"The degradation characteristics of high-purity (HP) magnesium (Mg) orthopedic implants under static and cyclic compressive loads (SCL and CCL) remain inadequately understood. This study developed an <em>in vivo</em> loading device capable of applying single SCL and CCL while shielding against unpredictable host movements. <em>In vitro</em> degradation experiments of HP Mg implants were conducted to verify the experimental protocol, and <em>in vivo</em> experiments in rabbit tibiae to observe the degradation characteristics of the implants. Micro-computed tomography and scanning electron microscope were used for three-dimensional reconstruction and surface morphology analysis, respectively. Compared to <em>in vitro</em> specimens, <em>in vivo</em> specimens exhibited significantly higher corrosion rates and more extensive cracking. Cracks in the <em>in vivo</em> specimens gradually penetrated deeper from the loading surface, eventually leading to a rapid structural deterioration; whereas <em>in vitro</em> specimens exhibited more surface-localized cracking and a relatively uniform corrosion pattern. Compared to SCL, CCL accelerated both corrosion and cracking to some extent. These findings provide new insights into the <em>in vivo</em> degradation behavior of Mg-based implants under compressive loading conditions.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"205 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981516","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":"Enhanced high-temperature strength of a Mg-4Sn-3Al-1 Zn alloy with good thermal stability via Mg2Sn precipitation","authors":"Wei Sun, Yangchao Deng, Yuhan Hu, Hongyi Zhan, Kun Yan, Sansan Shuai, Enyu Guo, Zebang Zheng, Guang Zeng","doi":"10.1016/j.jma.2024.12.024","DOIUrl":"https://doi.org/10.1016/j.jma.2024.12.024","url":null,"abstract":"With the growing demand for rapid and cost-effective solutions for lightweight magnesium alloys with excellent high-temperature mechanical properties, we investigated a heat-treatable RE-free magnesium alloy, Mg-4Sn-3Al-1Zn (TAZ431, wt.%), with remarkable thermal stability. The peak-aged TAZ431 alloy exhibits a 15 % increase in high-temperature (230 °C) yield strength, compared to the traditional commercial magnesium alloy, Mg-3Al-1Zn (AZ31, wt.%). In this work, we demonstrate that the basal Mg₂Sn precipitates have a more pronounced hindrance effect on the non-basal slip systems, as evidenced by a combination of experiments (in-situ EBSD and dual beam TEM) and numerical simulations (Orowan model and VPSC). The distribution and morphology of Mg₂Sn precipitates and cracks are quantitatively analyzed using a range of techniques including in-situ SEM and synchrotron X-ray tomography. Our results reveal that the decohension of grain boundary precipitates significantly promotes the formation of intergranular cracks, leading to ultimate fracture. The research comprehensively explains the impact of particle morphology, orientation, and distribution on precipitation strengthening and fracture modes at elevated temperatures, which is vital for the future development of high-temperature performance magnesium alloys.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"3 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142974796","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":"Effect of Al segregation on dislocation transmutation across {101¯2} twin boundaries in Mg: An atomistic simulation study","authors":"Lang Liu, Xuan Luo, Konstantinos Papadikis, Yunchang Xin, Qing Liu","doi":"10.1016/j.jma.2024.12.011","DOIUrl":"https://doi.org/10.1016/j.jma.2024.12.011","url":null,"abstract":"Atomistic simulations were adopted to study the solute segregation effect on dislocation transmutation across the &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;{&lt;/mo&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;&amp;#xAF;&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;}&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"2.779ex\" role=\"img\" style=\"vertical-align: -0.812ex;\" viewbox=\"0 -846.5 3073 1196.3\" width=\"7.137ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;use is=\"true\" xlink:href=\"#MJMAIN-7B\"&gt;&lt;/use&gt;&lt;g is=\"true\" transform=\"translate(500,0)\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMAIN-31\"&gt;&lt;/use&gt;&lt;use x=\"500\" xlink:href=\"#MJMAIN-30\" y=\"0\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(1001,0)\"&gt;&lt;g is=\"true\" transform=\"translate(35,0)\"&gt;&lt;use xlink:href=\"#MJMAIN-31\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(0,198)\"&gt;&lt;use x=\"-70\" xlink:href=\"#MJMAIN-AF\" y=\"0\"&gt;&lt;/use&gt;&lt;use x=\"70\" xlink:href=\"#MJMAIN-AF\" y=\"0\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(1571,0)\"&gt;&lt;use xlink:href=\"#MJMAIN-32\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;use is=\"true\" x=\"2572\" xlink:href=\"#MJMAIN-7D\" y=\"0\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;{&lt;/mo&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;}&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;{&lt;/mo&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;}&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt; twin boundaries in magnesium. For pure magnesium, the dislocation-twin reaction resulted in the formation of sessile dislocations accompanied by the fast migration of the twin boundary, and no 〈&lt;em&gt;c&lt;/em&gt; + &lt;em&gt;a&lt;/em&gt;〉 dislocation occurred. With Al segregation, instead, two basal dislocations transmuted into one prismatic 〈&lt;em&gt;c&lt;/em&gt; + &lt;em&gt;a&lt;/em&gt;〉 dislocation in the twin. Twin migration was significantly impeded, and the resultant twin disconnections stayed localized and had a higher step character than in pure Mg. To reveal the mechanism of the effect of solute segregation, the Peierls barriers of twin disconnections were calculated, and the dynamic evolutions of twin disconnection dipoles were simulated. The results suggested that Al segregation softened the Peierls barrier of twin disconnections but imposed a high pinning force on twin disconnection","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"31 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142939534","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}