Journal of Magnesium and Alloys最新文献

{"title":"Overcoming oxidation and enhancing dispersion of nanoparticles via molten salt: Configurational distribution of TiCnp in pure Mg","authors":"Xuanchang Zhang, Xiaojun Wang, Nodir Turakhodjaevr, Xuejian Li, Hailong Shi, Yuanyuan Zhang, Xiaoshi Hu, Chao Xu","doi":"10.1016/j.jma.2024.10.010","DOIUrl":"https://doi.org/10.1016/j.jma.2024.10.010","url":null,"abstract":"Nanoparticle-reinforced Mg matrix composites (NPMMCs) capitalize on the synergistic properties of nanoparticles and Mg matrix, resulting in enhanced mechanical attributes compared to matrix. Nonetheless, effective high-temperature dispersion of nanoparticles remains challenging. This study employs a molten salt dispersant (NaCl-KCl-MgCl₂) effectively mitigating the oxidation and combustion of TiC nanoparticles (TiC_np). Compared with the atmosphere, the molten salt facilitates the pre-dispersion of TiC_np through thermal motion at elevated temperatures, thereby reducing agglomeration between the TiC_np. Simultaneously, the molten salt effectively wets and disrupts the oxide layer on the surface of Mg melt, facilitating the wetting of TiC_np by the Mg melt. The successful incorporation of 3 vol.% TiC_np into the Mg matrix is achieved by utilizing molten salt, and the addition of TiC_np increases the viscosity of mg melt. Further dispersed by ultrasonic dispersion, the unique distribution of TiC_np within ring-like structures was obtained which was attributed to the increase of viscosity. As a configurational distribution, the ring-like TiC_np distribution morphology significantly enhances the mechanical properties of composites, as evidenced by an approximate 50 % increase in compressive strength (UCS).","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"33 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142673012","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 Gd content on microstructure and mechanical properties of Mg-xGd-Zr alloys via semicontinuous casting","authors":"Qianye Wu, Yujuan Wu, Qingchen Deng, Chenyang Ding, Yu Zhang, Nanxi Peng, Licheng Jia, Zhiyu Chang, Liming Peng","doi":"10.1016/j.jma.2024.10.013","DOIUrl":"https://doi.org/10.1016/j.jma.2024.10.013","url":null,"abstract":"Mg-Gd based alloys are an important class of high-performance Mg alloys. In this study, three Mg-Gd alloys with different gadolinium (Gd) contents: Mg-9.54Gd-0.40Zr (wt.%, G10 K), Mg-15.11Gd-0.35Zr (wt.%, G15 K) and Mg-19.67Gd-0.33Zr (wt.%, G20 K) were prepared by semicontinuous casting and subsequent solution and aging heat treatments. The role of Gd content on microstructures and mechanical properties of the Mg-Gd-Zr alloy is studied. All three as-cast alloys exhibit eutectic phases of Mg₅Gd, with the amount increasing as the Gd content rises. Mg₅Gd disappears after the solution heat treatment (the G10 K alloy solution-treated at 480 °C for 4 h, the G15 K alloy at 500 °C for 12 h and the G20 K alloy at 520 °C for 24 h, respectively). Aging heat treatment at 200 °C for 64 h after solution introduces numerous prismatic β′ precipitates, with a significant increase in their area number density corresponding to increased Gd content. Additionally, the morphology of the β′ precipitates exhibits distinct variations: the G10 K alloy is characterized by an enhanced aspect ratio. Consequently, the peak-aged G10 K alloy demonstrates superior strength-ductility synergy, with a yield strength (YS) of 216 ± 1 MPa, an ultimate tensile strength (UTS) of 363 ± 1 MPa, and an elongation (EL) of 8.7 ± 0.6 %. This study suggests that plasticity diminishes and precipitation strengthening is limited when the gadolinium content exceeds 15 wt.%.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"19 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601309","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":"Strengthening of Mg-Li alloy dominated by continuously hardened Mg phase during room temperature rolling","authors":"Zhonghao Heng, Xianzhe Shi, Lijuan Huang, Biao Chen, Jianghua Shen","doi":"10.1016/j.jma.2024.10.002","DOIUrl":"https://doi.org/10.1016/j.jma.2024.10.002","url":null,"abstract":"The process of room temperature rolling is a straightforward and efficient method for producing high strength Mg-Li alloys, but the underlying strengthening mechanism remains unclear. In this study, we successfully enhanced the tensile properties of a novel dual-phase Mg-Li alloy through room temperature rolling, with a remarkable yield strength of 201 MPa and an elongation-to-failure of 14 %. Microhardness testing was conducted to evaluate the contribution of the Mg- and Li- phases to the improvement in strength. The results demonstrate that the hardness of Mg-phase reaches 60 HV, which is significantly higher than the 49 HV observed in Li-phase, indicating that the Mg-phase after rolling plays a pivotal role in enhancing material strength. The presence of a high density of dislocations stored in the Mg-phase emerges as the dominant factor contributing to improved strength in Mg-Li alloys. In-situ compression testing reveals that 〈<em>c</em> + <em>a</em>〉 slip activation and twinning-induced slip serve as internal mechanisms for continuous deformation and hardening within the Mg-phase. Despite numerous precipitated Mg-phase particles within the Li-phase matrix, the hardness analysis reveals minimal strain-induced phase transformation effects on the overall strength of the Al-free and Zn-free Mg-Li alloy. These findings provide valuable insights for designing and fabricating high-strength dual-phase Mg-Li alloys.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"7 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601308","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":"Revealing Hetero-Deformation Induced (HDI) Hardening and Dislocation Activity in a Dual-Heterostructure Magnesium Matrix Composite","authors":"Lingling Fan, Ran Ni, Lingbao Ren, Peng Xiao, Ying Zeng, Dongdi Yin, Hajo Dieringa, Yuanding Huang, Gaofeng Quan, Wei Feng","doi":"10.1016/j.jma.2024.10.012","DOIUrl":"https://doi.org/10.1016/j.jma.2024.10.012","url":null,"abstract":"Integrating a heterogeneous structure can significantly enhance the strength-ductility synergy of composites. However, the relationship between hetero-deformation induced (HDI) strain hardening and dislocation activity caused by heterogeneous structures in the magnesium matrix composite remains unclear. In this study, a dual-heterogeneous TiC/AZ61 composite exhibits significantly improved plastic elongation (PEL) by nearly one time compared to uniform FG composite, meanwhile maintaining a high strength (UTS: 417 MPa). This is because more severe deformation inhomogeneity in heterogeneous structure leads to more geometrically necessary dislocations (GNDs) accumulation and stronger HDI stress, resulting in higher HDI hardening compared to FG and CG composites. During the early stage of plastic deformation, the pile-up types of GND in the FG zone and CG zone are significantly different. GNDs tend to form substructures in the FG zone instead of the CG zone. They only accumulate at grain boundaries of the CG region, thereby leading to obviously increased back stress in the CG region. In the late deformation stage, the elevated HDI stress activates the new 〈<em>c + a〉</em> dislocations in the CG region, resulting in dislocation entanglements and even the formation of substructures, further driving the high hardening in the heterogeneous composite. However, For CG composite, 〈<em>c + a〉</em> dislocations are not activated even under large plastic strains, and only 〈<em>a〉</em> dislocations pile up at grain boundaries and twin boundaries. Our work provides an in-depth understanding of dislocation variation and HDI hardening in heterogeneous magnesium-based composites.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"152 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601113","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":"Grain refinement, twin formation and mechanical properties of magnesium welds with addition of CNTs and TiC particles","authors":"Yongkang Gao, Lianyong Xu, Kangda Hao, Yongdian Han, Lei Zhao, Wenjing Ren","doi":"10.1016/j.jma.2024.10.009","DOIUrl":"https://doi.org/10.1016/j.jma.2024.10.009","url":null,"abstract":"In this work, microstructure and mechanical properties of Mg weld with addition of carbon nanotubes (CNTs) and TiC particles were investigated. The results showed that the weld microstructure was mainly presented as equiaxed grains with almost high angle grain boundaries. The introduction of reinforcements promoted the formation of precipitates and refined the grains effectively, the average grain size was refined by 51 % and 23 % with addition of CNTs and TiC particles, respectively. The dislocation density and the fraction of CSL boundaries were increased with addition of CNTs, while those were decreased with addition of TiC particles. Besides, the infrequent {10<span><span style=\"\"></span><span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&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;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"2.202ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -846.5 570.5 947.9\" width=\"1.325ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><g is=\"true\" transform=\"translate(35,0)\"><use xlink:href=\"#MJMAIN-31\"></use></g><g is=\"true\" transform=\"translate(0,198)\"><use x=\"-70\" xlink:href=\"#MJMAIN-AF\" y=\"0\"></use><use x=\"70\" xlink:href=\"#MJMAIN-AF\" y=\"0\"></use></g></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mover accent=\"true\" is=\"true\"><mn is=\"true\">1</mn><mo is=\"true\">¯</mo></mover></math></span></span><script type=\"math/mml\"><math><mover accent=\"true\" is=\"true\"><mn is=\"true\">1</mn><mo is=\"true\">¯</mo></mover></math></script></span>3} contraction twins formed within the weld due to the stress concentration caused by dislocation accumulation, which contributed to the Σ29 CSL boundary. The ultimate tensile strength and elongation rate were increased by 13.5 % and 40 % with addition of CNTs, while the ultimate tensile strength and micro-hardness were increased by 14.8 % and 20.9 % with addition of TiC particles.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"10 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142600883","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":"On the origin of non-basal texture in extruded Mg-RE alloys and its implication for texture engineering","authors":"X.Z. Jin, G.J. Yang, Xinyu Xu, D.B. Shan, B. Guo, B.B. He, C. Fan, W.C. Xu","doi":"10.1016/j.jma.2024.10.004","DOIUrl":"https://doi.org/10.1016/j.jma.2024.10.004","url":null,"abstract":"The work aims to investigate the formation and transformation mechanism of non-basal texture in the extruded Mg alloys. With this purpose a pure Mg as reference and eight Mg-Gd binary alloys with the Gd concentration ranging from 0.5 wt.% to 18 wt.% were prepared for extrusion. This study shows that the basal fiber texture in pure Mg transited into RE (rare earth) texture in diluted Mg-Gd alloys and into the abnormal C-texture in high-concentration Mg-Gd alloys. In pure Mg, discontinuous dynamic recrystallization plays a predominant role during the extrusion process, resulting in the formation of a typical basal fiber texture. Alloying with high concentration of Gd impedes the dynamic recrystallization process, facilitating the heterogeneous nucleation of shear bands as well as the dynamic recrystallization within shear bands. Dynamic recrystallized grains within shear bands nucleate with a similar orientation to the host deformed parent grains and gradually tilt their c-axis to the extrusion direction during growth by absorbing dislocations, leading to the formation of either the RE-texture orientation or the C-texture orientation, depending on the stored energy within shear bands. The analysis aided by IGMA and TEM characterization reveals that the shear bands originate from the extensive but heterogeneous activation of pyramidal I slip. Tensile tests illustrate a close correlation between the fracture elongation and texture types. A comprehensive understanding of the formation and transformation mechanism of different texture components in Mg alloys holds significant importance for the design of high-performance Mg alloys by texture engineering.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"95 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601112","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":"Cation-induced topical disordered niobium nickel oxide for robust hydrogen storage in magnesium hydride","authors":"Shuai Li, Liuting Zhang, Fuying Wu, Qian Li","doi":"10.1016/j.jma.2024.10.011","DOIUrl":"https://doi.org/10.1016/j.jma.2024.10.011","url":null,"abstract":"Catalytic doping is one of the economic and efficient strategies to optimize the operating temperature and kinetic behavior of magnesium hydride (MgH₂). Herein, efficient regulation of electronic and structural rearrangements in niobium-rich nickel oxides was achieved through precise compositional design and niobium cation functionalized doping, thereby greatly enhancing its intrinsic catalytic activity in hydrogen storage systems. As the niobium concentration increased, the Ni-Nb catalysts transformed into a mixed state of multi-phase nanoparticles (composed of nickel and niobium-rich nickel oxides) with smaller particle size and uniform distribution, thus exposing more nucleation sites and diffusion channels at the MgH₂/Mg interface. In addition, the additional generation of active Ni-Nb-O mixed phase induced numerous highly topical disordered and distorted crystalline, promoting the transfer and reorganization of H atoms. As a result, a stable and continuous multi-phase/component synergistic catalytic microenvironment could be constructed, exerting remarkable enhancement on MgH₂'s hydrogen storage performance. After comparative tests, Ni_0.7Nb_0.3-doped MgH₂ presented the optimal low-temperature kinetics with a dehydrogenation activation energy of 78.8 kJ·mol⁻¹. The onset dehydrogenation temperature of MgH₂+10 wt% Ni_0.7Nb_0.3 was reduced to 198 °C and 6.18 wt% H₂ could be released at 250 °C within 10 min. In addition, the dehydrogenated MgH₂<img alt=\"single bond\" src=\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/sbnd.gif\" style=\"vertical-align:middle\"/>NiNb composites absorbed 4.87 wt% H₂ in 10 min at 125 °C and a capacity retention rate was maintained at 6.18 wt% even after 50 reaction cycles. In a word, our work supplies fresh insights for designing novel defective-state multiphase catalysts for hydrogen storage and other energy related field.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"105 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597024","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 work hardening and softening behavior of AZ31 magnesium alloy sheets with hard plate accumulative roll bonding","authors":"Lu Sun, Feng Li, Jia Yang Zhang, Wen Tao Niu, Mu Zi Cao","doi":"10.1016/j.jma.2024.10.003","DOIUrl":"https://doi.org/10.1016/j.jma.2024.10.003","url":null,"abstract":"In this paper, the work hardening and softening behavior of AZ31 magnesium alloy sheets by hard plate accumulative roll bonding (HP-ARB) process in a specific temperature range was studied for the first time, and the cyclic stress relaxation test, EBSD, TEM and other characterization methods were used. When the rolling temperature is 350 °C, the grain size of magnesium sheets is refined to 4.32 (±0.36) µm on average, and it shows an excellent combination of strength and plasticity. The tensile strength reaches 307 (±8.52) MPa and the elongation is 12.73 (±0.84) %. At this time, the curve of work hardening rate decreases smoothly and the degree of hardening is the lowest, and the amplitude of stress drop Δσ_p in work softening test is the smallest with the increase of cycle times, which shows that the well coordination between work hardening and softening behavior has been achieved. Research has found that the combined effect of grain boundary strengthening and fine grain strengthening enhances the yield and tensile strength of magnesium sheets after three passes HP-ARB process at 350 °C. This is attributed to the high degree of dislocation slip opening in the pyramidal surface 〈a〉 and 〈<em>c</em> + <em>a</em>〉, which not only coordinates the c-axis strain of the entire grain, but also promotes the slip transfer of dislocations in the fine-grained region, significantly improving the elongation of the sheets. This study provides a new idea for the forming and manufacturing of high performance magnesium alloy sheets.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"45 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597025","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":"Magnesium ferrites and their composites based photocatalysts: Synthesis approaches, effect of doping, and operational parameters on photocatalytic performance for wastewater remediation","authors":"Rohit Jasrotia, Kanika Raj, , M. Ramya, Rajesh Kumar, Deepak Pathania, Yogesh Kumar, Abhishek Kandwal","doi":"10.1016/j.jma.2024.10.017","DOIUrl":"https://doi.org/10.1016/j.jma.2024.10.017","url":null,"abstract":"In recent years, increased discharge of toxic effluents into water bodies has severely harmed ecosystems and human well-being. Various techniques are employed to remove contaminants, among which photocatalysis have proven to be the most environment friendly and effective technique. This review focuses on MgFe₂O₄, an exceptional photocatalyst owing to their small band gap, spherical shape, magnetic responsivity, stability, reusability, cost-effectiveness and small crystallite size. We have covered comprehensive comparison of research studies from the past decade to assess. Magnesium ferrite's photocatalytic potential in pure, doped, and composite forms. Along with synthesis methods, degradation mechanisms, and shortcomings explained in detail. Furthermore, we have highlighted the enhanced photocatalytic capability of doped MgFe₂O₄ and their nanocomposites towards the various organic contaminants upon visible light irradiation under a comparatively short period of time. Factors like cation distribution, dosage, pH, as well as methods for recovery and reuse are discussed to aid in production of more efficient photocatalysts. There has been a lack of information on the techniques that can be used to overcome the various shortcomings of MgFe₂O₄ ferrite. Hence, we have accentuated on bringing forth such advanced techniques that would aid in driving the researchers’ attention towards the practical and industrial application of the hybrid MgFe₂O₄ nanoparticles. Lastly, the research gaps and industrial need of MgFe₂O₄ ferrite-based materials were addressed to offer a concise view.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"34 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597100","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":"Effects of heterogeneous microstructure evolution on the tensile and fracture toughness properties of extruded AZ31B alloys","authors":"ShengXiong Tang, Soya Nishimoto, Koji Hagihara, Michiaki Yamasaki","doi":"10.1016/j.jma.2024.10.005","DOIUrl":"https://doi.org/10.1016/j.jma.2024.10.005","url":null,"abstract":"This study aims to investigate the extrusion temperature effects on the development of heterogeneous microstructures and mechanical properties, focusing on their impact on the fracture toughness of AZ31B alloys. Magnesium AZ31B (Mg-3wt%Al-1wt%Zn) alloys with high strength and reasonable fracture toughness, featuring heterogeneous microstructures, were fabricated via warm/hot extrusion at temperatures ranging from 523 to 723 K. The AZ31B alloy extruded at 523 K was bimodally grained into coarse worked grains with high Kernel average misorientation (KAM) values and fine dynamically recrystallized (DRXed) grains (&lt; 10 µm) with intermediate KAM values. The 523 K-extruded alloy exhibited a high tensile yield strength of ∼280 MPa and fracture toughness <em>K</em>_JIC of ∼26 MPa·m^1/2. Conversely, the 723 K-extruded AZ31B alloy was trimodally grained into a small amount of worked grains, fine DRXed grains, and coarse DRXed grains (&gt; 10 µm) with low KAM values. The 723 K-extruded alloy exhibited low tensile yield strength but a high <em>K</em>_JIC value of ∼36 MPa·m^1/2 owing to the high energy dissipation for crack extension in the coarse DRXed grains.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"150 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597026","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}