Journal of Magnesium and Alloys最新文献

{"title":"Loading path and strain rate effects on the deformation behavior of [0001] textured nanocrystalline magnesium: An atomic-scale investigation","authors":"Hui Zhao ,&nbsp;Xuejian Yang ,&nbsp;Yan Peng ,&nbsp;Lu Wu ,&nbsp;Yu Wu ,&nbsp;Baodong Shi","doi":"10.1016/j.jma.2024.03.018","DOIUrl":"10.1016/j.jma.2024.03.018","url":null,"abstract":"<div><div>Molecular dynamics (MD) simulation is employed to investigate the deformation behavior under various loading paths and strain rates of nanocrystalline magnesium (NC Mg) with [0001] texture. Atomic-scale structural evolution of NC Mg was performed under uniaxial and biaxial loadings. In tension process, compression twins and basal slip dominate, while the compression process is dominated by tension twins. The activation mechanism of twinning is highly sensitive to the loading path and grain orientation. Meanwhile, the effect of strain rate on the structural evolution of NC Mg was investigated. It is found that the effect of strain rate on the plastic deformation of NC Mg is reflected through the plasticity delays and the way to release the stress. As the strain rate decreases, the plastic deformation mechanism gradually changes from intragranular to grain boundary. Some significant potential deformation mechanisms in the loading process were studied. It is observed that {<span><math><mrow><mn>11</mn><mover><mn>2</mn><mo>¯</mo></mover><mn>1</mn></mrow></math></span>} twins nucleated inside the grains, and the thickening process is completed by basal 〈a〉 slip of the twin boundary. The strain compatibility between twins is automatically optimized with loading. Moreover, the detwinning mechanism caused by the interaction between twins and basal stacking faults is clarified.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 2","pages":"Pages 839-857"},"PeriodicalIF":15.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140762133","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":"Microstructure and mechanical properties with different sintering temperature of AZ91D alloy","authors":"Limin Li ,&nbsp;Huanqing Li ,&nbsp;Pengya Lei ,&nbsp;Wei Liu ,&nbsp;Liwen Chen ,&nbsp;Hua Hou ,&nbsp;Yuhong Zhao","doi":"10.1016/j.jma.2024.01.024","DOIUrl":"10.1016/j.jma.2024.01.024","url":null,"abstract":"<div><div>The regulation of sintering temperature in spark plasma sintering enables the achievement of grain refinement, phase control, and performance enhancement in the preparation of AZ91D magnesium alloy. This study investigates the influence of sintering temperature on microstructural evolution and mechanical properties of the AZ91D alloy. Microstructural analysis was conducted using scanning electron microscopy, electron backscatter diffraction, and X-ray diffraction. Microscopic structures and mechanical behaviors were examined through hardness and tensile tests. Elevated sintering temperatures resulted in reduced secondary phase content, leading to a decrease in mechanical performance. The alloy exhibited optimal mechanical properties at 320°C. The nanoparticle coarsening process and particle evolution during sintering were simulated using phase field methods. By optimizing the sintering temperature, precise control over microstructural and textural evolution can be achieved, facilitating the attainment of desired hardness levels and mechanical properties.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 2","pages":"Pages 697-708"},"PeriodicalIF":15.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139574073","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":"Transmutation of zonal twinning dislocations during non-cozone {101¯1} twin-twin interaction in magnesium","authors":"Peng Chen ,&nbsp;Bin Li","doi":"10.1016/j.jma.2024.01.032","DOIUrl":"10.1016/j.jma.2024.01.032","url":null,"abstract":"<div><div>Theoretically, a twinning dislocation must stay on the twinning plane which is the first invariant plane of a twinning mode, because the glide of twinning dislocation linearly transforms the parent lattice to the twin lattice. However, recent experimental observations showed that a <span><math><mrow><mrow><mo>{</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>1</mn></mrow><mo>}</mo></mrow><mrow><mo>〈</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mover><mn>2</mn><mo>¯</mo></mover></mrow><mo>〉</mo></mrow></mrow></math></span> twin variant could cross another variant during twin-twin interaction. It is well known that <span><math><mrow><mo>{</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>1</mn></mrow><mo>}</mo></mrow></math></span> twinning is mediated by zonal twinning dislocations. Thus, how the zonal twinning dislocations transmute during twin-twin interaction is of great interest but not well understood. In this work, atomistic simulation is performed to investigate interaction between <span><math><mrow><mo>{</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>1</mn></mrow><mo>}</mo></mrow></math></span> twin variants. Our results show that when an incoming twin variant impinges on the other which acts as a barrier, surprisingly, the barrier twin can grow at the expense of the incoming twin. Eventually one variant consumes the other. Structural analysis shows that the twinning dislocations of the barrier variant are able to penetrate the zone of twin-twin intersection, by plowing through the lattice of one variant and transform its lattice into the lattice of the other. Careful lattice correspondence analysis reveals that, the lattice transformation from one variant to the other is close to <span><math><mrow><mrow><mo>{</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn></mrow><mo>}</mo></mrow><mrow><mo>〈</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mover><mn>1</mn><mo>¯</mo></mover></mrow><mo>〉</mo></mrow></mrow></math></span> twinning, but the orientation relationship deviates by a minor lattice rotation. This deviation presents a significant energy barrier to the lattice transformation, and thus it is expected such a twin-twin interaction will increase the stress for twin growth.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 2","pages":"Pages 681-696"},"PeriodicalIF":15.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139917076","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":"Study on the theoretical and mechanism of CaF₂-catalyzed vacuum carbothermal reduction of MgO","authors":"Tingzhuang Ma ,&nbsp;Bin Yang ,&nbsp;Yang Tian ,&nbsp;Neng Xiong ,&nbsp;Baoqiang Xu ,&nbsp;Guozheng Zha ,&nbsp;Rong Yu ,&nbsp;Dong Liang ,&nbsp;Lipeng Wang ,&nbsp;Dong Wang","doi":"10.1016/j.jma.2024.06.020","DOIUrl":"10.1016/j.jma.2024.06.020","url":null,"abstract":"<div><div>The increasing demand for magnesium as a next-generation structural material highlights the significance of incorporating CaF₂ as a catalyst to enhance the efficiency of vacuum carbothermal reduction of magnesium (VCTRM). This study investigates the thermodynamic theory and catalytic mechanism of CaF₂ in the VCTRM process. Catalytic reduction experiments and molecular dynamics simulations were conducted to gain a comprehensive understanding of the process. Thermodynamic calculations indicate that in vacuum carbothermal reduction, the primary reaction occurs between MgO and C. Analysis shows that CaF₂'s catalytic action primarily involves F⁻, Ca²⁺, and melt eutectic. Our experiments demonstrate that the addition of CaF₂ significantly increases the reduction rate. Furthermore, the mass loss rate increases with both the quantity of CaF₂ added and the holding time, stabilizing at additions over 5%. Experiments conducted at temperatures above the melting point of CaF₂ exhibited a pronounced catalytic effect. The resultant magnesium showed optimal structure and crystallization, with a purity of 87.84%. Notably, while CaF₂ remained in the residue, it was not detected in the condensate, confirming its catalytic role. Molecular dynamics simulations revealed that molten CaF₂ sabotages the structure of magnesium oxide, with F⁻ dispersing onto the surface of MgO, thus enhancing the reaction between MgO and C to form CO. However, no chemical reaction was observed between C, MgO, and CaF₂. The occurrence of the carbothermal reduction reaction at high temperatures depends on the concentration of the reducing agent C, with CaF₂ influencing the reaction rate. This research elucidates the theoretical and mechanistic foundations of CaF₂-catalyzed VCTRM, aligning with the green energy-saving concept and significantly advancing the green and efficient VCTRM process.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 2","pages":"Pages 731-745"},"PeriodicalIF":15.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141703942","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":"Creep properties and fracture behavior of AZ31B extruded sheets with mixed-grain microstructures of different morphologies","authors":"Xiaoxia Zhang ,&nbsp;Ming Li ,&nbsp;Hongxia Wang ,&nbsp;Jiao Cui ,&nbsp;Lei Song ,&nbsp;Naidong Ren ,&nbsp;Lifei Wang ,&nbsp;Weili Cheng ,&nbsp;Kwangseon Shin","doi":"10.1016/j.jma.2024.08.013","DOIUrl":"10.1016/j.jma.2024.08.013","url":null,"abstract":"<div><div>In this work, AZ31B extruded sheets with mixed-grain microstructures were prepared through extrusion. Samples of mixed-grain microstructure with different morphologies were selected from the AZ31B extruded sheets (referred to as M1 and M2 samples, respectively). The creep tests were performed on these samples at the temperature range of 150–200 °C, and the stress level range of 50–100 MPa. The creep properties and fracture behavior of AZ31 extruded sheets with mixed-grain microstructures were studied. Results showed that the creep properties of the M2 sample always outperformed that of the M1 sample and M1 and M2 samples’ creep was dominated by dislocation movement. The creep rate of M2 samples (1.5 × 10^-7 ± 1.1 × 10^-10 s^-1) is an order of magnitude lower than that of M1 samples (4.8 × 10^-6 ± 8.1 × 10^-10 s^-1) at 200 °C under 50 MPa The high activity of basal slip and softening mechanism in the M1 sample significantly accelerated creep, resulting in a relatively high creep rate. Moreover, the stress concentration within the M1 sample caused by deformation incompatibility, increased the initiation and propagation of voids, ultimately leading to fracture and poorer creep performance. However, the numerous &lt;10 µm fine grains surrounding deformed coarse grains in the M2 sample facilitated better coordination of deformation through dislocation slip, effectively slowing down the initiation of voids during the creep process. Meanwhile, the strain was uniformly distributed within each grain, mitigating stress concentration, inhibiting voids propagation, and contributing to the superior creep resistance of the M2 sample.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 2","pages":"Pages 777-791"},"PeriodicalIF":15.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550842","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":"Interpretable machine learning excavates a low-alloyed magnesium alloy with strength-ductility synergy based on data augmentation and reconstruction","authors":"Qinghang Wang, Xu Qin, Shouxin Xia, Li Wang, Weiqi Wang, Weiying Huang, Yan Song, Weineng Tang, Daolun Chen","doi":"10.1016/j.jma.2025.01.003","DOIUrl":"https://doi.org/10.1016/j.jma.2025.01.003","url":null,"abstract":"The application of machine learning in alloy design is increasingly widespread, yet traditional models still face challenges when dealing with limited datasets and complex nonlinear relationships. This work proposes an interpretable machine learning method based on data augmentation and reconstruction, excavating high-performance low-alloyed magnesium (Mg) alloys. The data augmentation technique expands the original dataset through Gaussian noise. The data reconstruction method reorganizes and transforms the original data to extract more representative features, significantly improving the model's generalization ability and prediction accuracy, with a coefficient of determination (R²) of 95.9 % for the ultimate tensile strength (UTS) model and a R² of 95.3 % for the elongation-to-failure (EL) model. The correlation coefficient assisted screening (CCAS) method is proposed to filter low-alloyed target alloys. A new Mg-2.2Mn-0.4Zn-0.2Al-0.2Ca (MZAX2000, wt%) alloy is designed and extruded into bar at given processing parameters, achieving room-temperature strength-ductility synergy showing an excellent UTS of 395 MPa and a high EL of 17.9 %. This is closely related to its hetero-structured characteristic in the as-extruded MZAX2000 alloy consisting of coarse grains (16 %), fine grains (75 %), and fiber regions (9 %). Therefore, this work offers new insights into optimizing alloy compositions and processing parameters for attaining new high strong and ductile low-alloyed Mg alloys.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072178","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":"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}