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Volume 46 期 3，2026 2026年第46卷第3期

  • Topic·Rare Earth Magnesium Alloy

    “镁合金板材成形难题一直是商用领域关注焦点。专家探索将双辊铸轧技术应用于含长周期有序结构相的Mg-Y-Zn合金，构建二维简化模型并模拟不同LPSO相含量合金的铸轧过程，分析冷却条件、轧辊转速和喷嘴温度等参数对成形性影响，为商用镁合金板材成形提供新思路。”

    YU Hui, HE Zhixin, MA Hanyu, DONG Xiaorui, YU Wei, JIANG Bin′an, XU Qiong, SHIN Kwangseon, LIU Chao

    DOI：10.15980/j.tzzz.Z20250016
    摘要：To address the shortcoming of poor formability of commercial magnesium alloy sheets， the feasibility of applying twin roll casting （TRC） to Mg-Y-Zn （WZ） alloy sheets with long period stacking ordered （LPSO） phase was explored. A simplified 2D model was established， and finite element （FE） software was employed to simulate TRC process of alloys featuring varying LPSO contents. The influence of parameters including cooling conditions， rolling speed and nozzle temperature on rolling formability was analyzed using single-factor analysis and orthogonal experimental range analysis. The results reveal that the higher Y content results in an expanded solidification range for WZ alloy， accompanied with intensified segregation tendencies. The influence sequence on TRC formability of WZ alloy is determined as rolling speed， LPSO phase content， and nozzle temperature. Furthermore， the interplay between LPSO and nozzle temperature emerges as prominent factor. With the escalation of LPSO phase content， deformation resistance is enhanced with severe edge cracking， and the uneven distribution of equivalent strain in the core region is exacerbated， intensfying the cracking tendency.  
    关键词：Mg Alloy;Twin Roll Cast;Finite Element;LPSO;Processing Optimization   
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    “介绍了其在材料加工领域的研究进展，专家对Mg-2Zn-0.5Y-0.4Nd合金进行感应加热旋锻加工，发现边部区域力学性能优于心部，为合金加工技术优化提供了新思路。”

    DOU Haosheng, CAO Wenguan, WANG Chang, MEI Di, SUN Yufeng, GUAN Shaokang

    DOI：10.15980/j.tzzz.Z20250014
    摘要：Mg-2Zn-0.5Y-0.4Nd alloy was subjected to induction heating rotary swaging at 250 ℃， and the microstructural evolution as well as strengthening mechanisms at the center and edge were analyzed comparatively under 40% and 68% deformation. The results indicate that the alloy after rotary swaging is composed of α-Mg matrix and W-Mg₃（Y，Nd）₂Zn₃ phase， whereas the coarse W phase is fragmented during deformation， which is distributed in a streamlined pattern along processing direction. Due to the radial stress gradient during rotary swaging， the edge region becomes the major deformation zone， where the degree of grain refinement and recrystallized dynamic fraction are greater than that of one at the center region. Mechanical property tests reveal that the edge region achieves superior mechanical properties， where the yield strength， tensile strength， and elongation reach up to 338 MPa， 364 MPa， and 12.6%， respectively， under 68% deformation， which are significantly higher than those of the center region （315 MPa， 330 MPa， and 6.2%）. Meanwhile， the edge region maintains desirable ductility， presenting excellent strength-ductility synergy. The results indicate that induction-heating rotary swaging can significantly enhance mechanical properties of Mg-2Zn-0.5Y-0.4Nd alloy， in spite of significant heterogeneity remaining in microstructure and performance.  
    关键词：Mg-2Zn-0.5Y-0.4Nd Alloy;Rotary Swaging;Mechanical Properties;Microstructure   
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    ““T”型铸造模具配备脉冲磁场装置，显著降低VW93-0.5Ag-0.1Zn合金热裂倾向性，细化晶粒，改变第二相形貌，提升补缩能力。”

    LI Chunyu, SONG Jiangfeng, LIAO Jin′ge, GUO Xin, LIU Yi, LIU Shengqing, YANG Lixiang, YANG Yuansheng

    DOI：10.15980/j.tzzz.Z20250007
    摘要：Effects of pulsed magnet field on hot tearing susceptibility of Mg-9Gd-3Y-0.5Zr-0.5Ag-0.1Zn （VW93-0.5Ag-0.1Zn） alloy was investigated using a “T” shaped casting mold equipped with a pulsed magnetic field device. The microstructure and fracture of the alloy were characterized experimentally by optical microscopy （OM） and scanning electron microscopy （SEM）， and size of hot tearing and grain were quantified. The results reveal that the application of a pulsed magnetic field significantly reduces the hot tearing susceptibility of VW93-0.5Ag-0.1Zn alloy， which is minimized at a voltage value of 150 V. In addition， pulsed magnetic field promotes the enrichment of eutectic phase and improves the feeding ability of residual liquid phase， leading to the morphology transtormation of enriched second phase. The alloy grains are significantly refined under the action of magnetic field， which reduces the solidification shrinkage strain per unit grain boundary at the hot spot， thus degrading the hot tearing susceptibility.  
    关键词：Mg-Gd-Y Alloys;Pulsed Magnetic Field;Hot Tearing Susceptibility;Eutectic   
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    “揭示了稀土元素钆（Gd）含量对Mg - Gd合金关键性能的调控机制与影响规律，为合金性能优化提供理论依据。”

    YANG Yuntao, CHEN Ke, HOU Li′na, SONG Ziyang, WANG Longfei, LI Zihan, YAN Jing, WANG Shuming

    DOI：10.15980/j.tzzz.T20250294
    摘要：The regulatory mechanism and influence law of rare earth gadolinium （Gd） content on the key properties of Mg-Gd alloys were reviewed. In terms of mechanical properties， there is a critical threshold for Gd content to achieve synergistic optimization of strength and plasticity. Below the threshold， Gd can enhance strength and plasticity through both solid solution strengthening and texture weakening. After exceeding the threshold， the strength is significantly improved due to the precipitation of strengthening phases during aging， while the plasticity is deteriorated sharply， leading to an imbalance of strength and toughness. The microstructure evolution exhibits nonlinear characteristics， where medium Gd content can maximize the grain refinement effect and promote the uniform and dipersive distribution of the second phase， while ultra-high Gd content can easily induce continuous network brittle phases at grain boundaries， disrupting the continuity of the matrix. Meanwhile， high solute enrichment may inhibit nucleation， resulting in grain coarsening. Regulation of Gd，Y mass ratio in multicomponent alloys plays a decisive role in phase composition and refinement mechanism. The corrosion resistance is controlled by microstructure uniformity and morphology of the second phase， where alloys with low or medium Gd content exhibit optimal corrosion resistance due to the uniform microstructure and dense Gd（OH）3 protective layer， while ultra-high Gd content constructs a corrosion barrier through a network Mg5Gd phases， significantly enhancing the barrier effect. In addition， the corrosion resistance of as-extruded alloys is generally superior to that of as-cast alloys.  
    关键词：Mg-Gd Alloy;Mechanical Properties;Microstructure;Corrosion Resistance;Rare Earth Elements   
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    “基于ZBYT500多功能液态成型装备，采用间接挤压铸造工艺制备了ZM5镁合金隔板件，重点探究了铸态及热处理态下铸件的微观组织与力学性能演变。同时，对挤压铸造过程中产生的宏观偏析缺陷进行了系统表征与分析，研究了其形成机理、偏析区组织性能特征及其影响机制，并提出了相应的减控措施。结果表明，铸态试样的抗拉强度和伸长率分别为181.57 MPa和6.5%，经热处理后分别提升至287.9 MPa和10.8%。隔板件内偏析主要集中于壁厚突变区域。偏析的根本原因是Al元素的大量富集，而T6热处理工艺通过促进元素扩散，可有效减轻材料的偏析现象。”

    LI Jiacheng, CHEN Liwen, ZHAO Yuan, JING Jianhui, ZHANG Keke, WANG Pingping, HOU Hua, ZHAO Yuhong

    DOI：10.15980/j.tzzz.T20250305
    摘要：ZM5 magnesium alloy spacer parts was facilitated using indirect squeeze casting process by ZBYT500 multifunctional liquid molding equipment， focusing on the microstructure evolution and mechanical properties of as-cast and heat-treated castings. Additionally， the macroscopic segregation defects formed during squeeze casting process were systematically characterized and analyzed. The formation mechanisms， structure and performance characteristics and influence mechanisms were investigaterd， and corresponding reduction and control measures were proposed. The results indicate that the tensile strength and elongation of as-cast specimens reach up to 181.57 MPa and 6.5%， which is significantly increased to 287.9 MPa and 10.8% ， respectively， after heat treatment. The segregation in the spacer is predominantly concentrated in areas with thick-walled variations， which is attributed to the substantial enrichment of Al element. Moreover， T6 heat treatment process effectively relieve the segregation phenomenon by promoting elemental diffusion.  
    关键词：Squeeze Casting;Magnesium Alloy;Microstructure;Mechanical Properties;Segregation   
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