Journal of Magnesium and Alloys最新文献

{"title":"Uncovering the impact of Gd content on the microstructure and mechanical properties of wire-arc directed energy deposited Mg-Gd-Y-Zr alloys","authors":"Xinzhi Li, Jiarong Guo, Mugong Zhang, Li Guan, Haonan Wu, Jian Zhou, Xuewei Fang, Liang Gui, Ke Huang","doi":"10.1016/j.jma.2025.04.019","DOIUrl":"https://doi.org/10.1016/j.jma.2025.04.019","url":null,"abstract":"The preparation of large-sized magnesium rare-earth (Mg-RE) alloy parts using wire-arc directed energy deposition (WA-DED) has clear advantages such as high-efficiency and cost-effective. The impact of Gd content, which is one of the most important RE elements, on the microstructure evolution and mechanical response of the as-deposited and heat-treated Mg-Gd-Y-Zr alloys, deserves to be thoroughly unveiled. Herein, multi-scale microstructure characterization and mechanical evaluation of Mg-<em>x</em>Gd-2Y-0.5Zr (wt%, <em>x</em> = 4, 7, and 10) alloys were carried out. Specifically, the increased Gd content facilitates the grain refinement, micro-segregation, and precipitation during the deposition process. As a result, the strength of the as-deposited samples with increased Gd content was improved through refined grain and dispersion strengthening of nano-β\", but the ductility was severely deteriorated due to the premature failure caused by excessive β-Mg₂₄(Gd, Y)₅ eutectic phases. Besides, the increased Gd content successfully restrains grain coarsening through higher content of eutectic phase and larger RE-rich region during solution treatment. Following peak-aging treatment, while the increased Gd content does not affect the precipitation types, the content of nano-β' was remarkably enhanced, which leads to excellent strength. Ultimately, a superior yield strength of 239 MPa, an ultra-high ultimate tensile strength of 371 MPa and an elongation of 4 % are achieved in the solution plus aging-treated Mg-10Gd-2Y-0.5Zr alloy. This study thus provides guidelines on the composition modification and post-treatment of WA-DED Mg-Gd-Y-Zr alloys suitable for engineering applications.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"91 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932513","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":"Unraveling the Mg2+/Li+ dual-ion co-intercalation mechanism in 3D MXene heterojunctions for enhanced Mg/Li hybrid ion battery performance","authors":"Fanfan Liu, Xiaomeng Fan, Xinyue Gao, Jinjin Ban, Guoqin Cao, Shilin Zhang, Junhua Hu","doi":"10.1016/j.jma.2025.04.011","DOIUrl":"https://doi.org/10.1016/j.jma.2025.04.011","url":null,"abstract":"Rechargeable Mg/Li hybrid ion batteries with Mg²⁺/Li⁺ double-salt electrolytes and safe Mg anodes are a viable option for large-scale energy storage. Nevertheless, achieving the desired reasonable electrochemical performance remains a great challenge due to the capacity limitations of conventional Li-intercalation cathodes. To mitigate this limitation, the 3D oxygenated MXene Ti₃C₂@CoS₂/FeS₂ (denoted as o-Ti₃C₂@CoS₂, o-Ti₃C₂@FeS₂) with both dual-storage mechanism and multidimensional structure to achieve the desirable storage capacity is engineered. Benefiting from the formation of special structure and interfacial chemical bonds Ti–O–Co/Ti–O–Fe, as well as the electronegative o-Ti₃C₂ weaken the Co–S/Fe–S bonds, the o-Ti₃C₂@CoS₂ cathode exhibits superior capacity up to 425 mAh <em>g</em>⁻¹ at 100 mA <em>g</em>⁻¹ and overwhelming advantageous ultra-long life over 2,400 cycles at 500 mA <em>g</em>⁻¹. Simultaneously, the o-Ti₃C₂@FeS₂ also displays a high-rate capability, outstanding cycling stability, and fast diffusion kinetics. Furthermore, the conversion reaction of Mg²⁺/Li⁺ co-intercalation and the charge storage mechanism during cycling are thoroughly clarified by systematic ex-situ characterizations and theoretical computations. This study reveals the influence of MXene electrode structure on the importance of electrochemical performance and provides guidance for the future design of high-performance MXene materials for energy storage applications.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"11 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932514","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":"Additive manufacturing high-strength and ultra-high-rare-earth magnesium alloys: Excellent long-time aging hardening and strengthening behavior","authors":"Zhe Xu, Zhuo Li, Chunjie Shen, Dongdong Zheng, Yuxuan Tu","doi":"10.1016/j.jma.2025.04.007","DOIUrl":"https://doi.org/10.1016/j.jma.2025.04.007","url":null,"abstract":"Gadolinium (Gd) is one of the most effective strengthening elements for magnesium alloys. The development of commercially available Mg-Gd alloys with high Gd content and the optimization of their preparation processes have been a major focus in magnesium alloy research. In this study, a Mg-23Gd-2Zn-0.4Zr alloy with ultra-high Gd content is designed, and high-quality fabrication is achieved using laser-directed energy deposition (LDED) technology. Through heat treatment and microstructure control, a balance between tensile strength (425 MPa) and elongation (3.4 %) is achieved. The ultra-high strength of the LDED-T6 VZ232K alloy is primarily attributed to precipitation strengthening caused by the ultra-high density (2.4 × 10⁴ µm^-2) of β′ phase. The high ductility is mainly due to the modification of the fracture mode, facilitated by the introduction of a substantial number of stacking fault structures during solution heat treatment. The extended hardness plateau (exceeding 138 Hv) and high yield strength (exceeding 300 MPa) are associated with the three-directional cross-interlocked structure of the β′ phase in the over-aged state at 220 °C and 250 °C. The analysis of the LDED-VZ232K alloy indicates that reduced heat input during the additive manufacturing (AM) process is critical for the defect-free fabrication of alloys with ultra-high Gd content.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"25 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932515","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":"Evaluation of damage evolution in pure magnesium during surrogate high-energy electron irradiation for Brachytherapy seed application","authors":"Hucheng Yu, Sichen Dong, Qi Chen, Xiaoou Yi, Hui Liu, Hao Fang, Wentuo Han, Pingping Liu, Somei Ohnuki, Farong Wan","doi":"10.1016/j.jma.2025.04.010","DOIUrl":"https://doi.org/10.1016/j.jma.2025.04.010","url":null,"abstract":"Evaluation of damage evolution effects in biodegradable pure Mg was carried out, using transmission electron microscope as surrogate irradiation for high-energy radionuclide β decay in Brachytherapy. Time-dependent quantitative defect production, evolution dynamics, and evolution statistics were revealed &lt;em&gt;in-situ&lt;/em&gt; for two prism foils (&lt;strong&gt;&lt;em&gt;z&lt;/em&gt;&lt;/strong&gt; = [&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;1&lt;/mn&gt;&lt;mrow is=\"true\"&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;&amp;#xAF;&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;/mrow&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;/g&gt;&lt;g is=\"true\" transform=\"translate(500,0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\" transform=\"translate(35,0)\"&gt;&lt;use xlink:href=\"#MJMAIN-32\"&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(570,0)\"&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&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;1&lt;/mn&gt;&lt;mrow is=\"true\"&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;/mrow&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;1&lt;/mn&gt;&lt;mrow is=\"true\"&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;], [&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;mrow is=\"true\"&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;/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 ","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"12 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931120","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":"Microstructure and mechanical properties of AZ91/TiP magnesium matrix composite ribbons fabricated by melt-spinning","authors":"Xiaodan Song, Tianguo Wang, XinTao Li, Zhenyang Liu, Xiaohui Zhang, Bo Feng, Huantao Chen, Kaihong Zheng, Fusheng Pan","doi":"10.1016/j.jma.2025.04.018","DOIUrl":"https://doi.org/10.1016/j.jma.2025.04.018","url":null,"abstract":"There are few studies on the preparation of magnesium matrix composites (MMCs) by rapid solidification. This study aims to add minor amounts of Ti particles to AZ91 alloy and prepare AZ91/Ti_P MMC ribbon by Melt-Spinning (MS). The effects of Ti particle content on the microstructure and mechanical properties of AZ91/Ti_P ribbon were studied by scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD), transmission electron microscopy (TEM), three-dimensional profiling (3D-P) and calculation of supercooling rate. The results show that the grain refinement of AZ91 ribbon prepared by rapid solidification is very significant and the grain refinement is further improved with the increase of Ti particle content; at the same time, the growth of β-Mg₁₇Al₁₂ is inhibited, and the interface reaction between Ti and Mg leads to the formation of interfaces around Ti particles. These nano-scale Ti₃Al and Al₃Ti interface compounds uniformly wrap the Ti particles. It is believed that the addition of Ti particles not only helps to refine the surrounding grains, but also increases the dislocations in the MMC ribbon and forms a good interface, thereby improving the mechanical properties. Compared with AZ91 alloy ribbon, the yield strength and tensile strength of MMC material containing 5 wt.% Ti particles increased by 25.0 % and 22.7 % respectively. The elongation only decreased by 10.9 %. AZ91/5 wt.% Ti_P ribbon has a better balance between high strength and high elongation. The analysis shows that the strengthening effect of this mechanical property is mainly attributed to fine grain strengthening, dislocation strengthening and non-basal slip.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"39 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143926344","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":"Strength improvement achieved by microstructure regulation for wire-arc directed energy deposited Mg-Li alloy","authors":"Yueling Guo, Xinglong Di, Ruiwen Shao, Ming Fan, Xiaoxue Chang, Changmeng Liu, En-Hou Han","doi":"10.1016/j.jma.2025.04.016","DOIUrl":"https://doi.org/10.1016/j.jma.2025.04.016","url":null,"abstract":"Here we fabricate LA103Z Mg-Li alloy via wire-arc directed energy deposition (WA-DED), and subsequent aging treatment is employed to improve its mechanical property. Results show that a typical dual-phase microstructure is formed upon WA-DED, consisting of α-Mg, β-Li, AlLi and Li₂MgAl, with negligible porosity, and the core-shell Li₂MgAl/AlLi composite particles are also generated. After aging treatment, the microstructure is slightly coarsened, together with the precipitation of nano-sized D0₃−Mg₃Al particles, as well as the dissolution and the mergence of α-Mg phases. Negligible strength and ductility anisotropies are found for the as-deposited alloy. Significant strength increment is achieved via aging treatment, and the ultimate strength increases by ∼20% (∼34 MPa), reaching 200±1 MPa. Both as-deposited and aged alloys show acceptable uniform elongation, with a transgranular fracture mode. Precipitation strengthening enabled by nano-sized D0₃−Mg₃Al precipitates is primarily responsible for the strength increment mediated by aging treatment. Grain refinement strengthening and solid solution strengthening provide additional contributions to the improved strength. Our work thus offers an applicable additive manufacturing pathway for the efficient and safety-guaranteed fabrication of Mg-Li alloy components with decent mechanical property.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"10 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143920321","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 element Ce on the strain rate sensitivity of Mg-Zn-Zr alloy","authors":"","doi":"10.1016/j.jma.2025.04.017","DOIUrl":"https://doi.org/10.1016/j.jma.2025.04.017","url":null,"abstract":"Investigations into the strain rate sensitivity of magnesium (Mg) alloys represent a current research focus in materials science. However, most studie…","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"66 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143915572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Achieving high modulus and strength in ultra-light Mg-Li alloys through in situ-synthesized Mg2Si phase","authors":"Yangyang Xu, Meng Li, Yuchuan Huang, Jiawei Sun, Peng Sun, Hongchao Xiao, Gang Zeng, Qi Li, Youjie Guo, Guohua Wu, Wencai Liu","doi":"10.1016/j.jma.2025.04.009","DOIUrl":"https://doi.org/10.1016/j.jma.2025.04.009","url":null,"abstract":"Enhancing the low modulus and absolute strength of Mg-Li alloys remains a key research focus. This study employed an in situ-synthesis strategy to incorporate high-modulus phases, such as Mg₂Si, achieving a synergistic improvement in strength, plasticity, and modulus. The presence of Mg₂Si improved the microstructure of the matrix and promoted dynamic recrystallization, leading to a refined grain size of 2.9 µm. Through the combined effects of grain refinement strengthening and coefficient of thermal expansion mismatch strengthening, the Mg-8Li-3Al-2Zn-1Y-0.5Mn-0.5Gd-1Si alloy exhibited exceptional mechanical properties, including a yield strength of 248 MPa, an ultimate tensile strength of 273 MPa, an elastic modulus of 51 GPa, and a plasticity of 20.6 %. This study offers a new approach for designing and developing ultra-light, high-modulus Mg-Li alloys.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"39 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143915570","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":"Exploring high-performance magnesium-sulfur pouch cells using nitrogen-rich doped nano porous carbon","authors":"Yingying Yao, Yinghui Li, Zhao Li, Hao Xu, Yang Zhan, Fengzhan Sun, Ya Yang, Richard M. Laine, Liang Fu, Jianxin Zou","doi":"10.1016/j.jma.2025.03.028","DOIUrl":"https://doi.org/10.1016/j.jma.2025.03.028","url":null,"abstract":"Magnesium-sulfur batteries (MSBs) are promising due to Mg's lower propensity to form dendrites, its natural abundance, and high volumetric energy densities for large-scale energy storage. Nonetheless, Mg²⁺ ions have poor diffusion kinetics and the magnesium polysulfide (MgPS) shuttle effect present significant challenges for MSBs. Herein, a Mg-S pouch cell is designed using rich N-doped porous carbon (ZIF8-NC) and a Cu current collector. This architecture provides numerous benefits: i) ZIF8-NC offers a conductive skeleton that significantly enhances electron and Mg²⁺ ion conduction, ii) zeolite imidazolate frameworks (ZIF-8) derived N rich sites demonstrate superior MgPS anchoring capability, iii) the Cu collector not only accelerates conversion of anchored MgPS to MgS, but also participates in the electrode reaction and iv) the material is easy to synthesize on a large scale, facilitating its potential for practical applications. Mg-S/ZIF8-NC coin cells maintain ∼310 mAh·g^-1 after 1000 cycles even at 1C. Furthermore, Mg-S/ZIF8-NC pouch cells achieve high cathodic energy densities of ∼120 Wh·kg^-1 and ∼330 mAh·g^-1 after 300 cycles at 1C, outperforming the state-of-the-art results in the literature. Soft X-ray absorption spectroscopy (sXAS) revealed that the initial catalytic reaction of Cu follows Cu⁰↔Cu₂S, and later Cu₂S↔Cu_xS. Theoretical calculations and experimental results reveal that pyridine nitrogen acts as catalytic site for polysulfide adsorption. Therefore, this work not only provides a facile method to prepare high-performance Mg-S pouch cells, but also proposes mechanisms whereby N active sites and Cu catalytic reactions promote all aspects of performance.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"12 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143915573","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":"Unusual tensile strengths and strain-hardening behaviors and their structural correlation of Mg-RE solid solution","authors":"Wenbo Luo, Rongsheng Bai, Zhilei Yu, Xiuzhu Han, Tong Guo, Zhiyong Xue, Chen Wen, Mingyue Zheng, Feng Li, Zhihao Lin","doi":"10.1016/j.jma.2025.04.002","DOIUrl":"https://doi.org/10.1016/j.jma.2025.04.002","url":null,"abstract":"This study systematically investigates the unusual tensile mechanical behavior of Mg-RE solid solution (SS) alloys, exhibiting anomalous tensile strengths (ATS) and an enhanced strain-hardening rate at high temperature. Both the peak ultimate tensile strength (UTS) and tensile yield strength (TYS) values occur at 150–200 °C, which are 12–50% higher compared to those at room temperature (RT). Meanwhile, the strain-hardening rate increases with the temperature rising from RT to 200 °C during the plastic deformation process. The results reveal that the formation of stacking faults (SFs) and the locking of dislocations, particularly immobile 〈c〉 partial dislocations, enhance resistance to plastic deformation, leading to higher strengths at high temperature. Furthermore, the interactivity between SFs and 〈<em>c</em> + <em>a</em>〉 dislocations intensify with rising of temperature. The presence of RE atoms in the SS plays a critical role in this unique mechanical behavior, as they preferentially occupy non-basal planes rather than basal planes, thereby reducing the stacking fault (SF) formation energy. This study provides new insights into the high-temperature strengthening mechanisms of Mg-RE based alloys, offering potential guidance for the design of advanced lightweight materials with superior mechanical properties.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"1 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143901320","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}