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Volume 46 期 4，2026 2026年第46卷第4期

  • Topic·Rare Earth Magnesium Alloy: Part 2

    WANG Yongbiao, XU Jianlin, JIANG Junjie, ZHANG Naifang, JIA Jingjing, CUI Hongyang, MA Zuopo, LIU Mengyao, YANG Chubin

    DOI：10.15980/j.tzzz.Z20250015
    摘要：The research progress in solidification structure of Mg-RE alloy through synchrotron radiation technology was systematically reviewed. In terms of dendrite growth kinetics， synchrotron radiation technology can quantitatively reveal the effects of alloy composition and process parameters on dendrite growth， and achieve 3D reconstruction of dendrite morphology. In aspect of long-period stacking ordered （LPSO） phase， the technology can analyze the crystal structure， formation conditions and morphology of different types of LPSO phases.With regard to defect behavior， synchrotron radiation technology can accurately characterize the defects during solidification process， and track the evolution of defects in real time. Finally， the future development trend was prospected.  
    关键词：Mg-RE Alloy;Solidification Structure Control;Synchrotron Radiation Technology;LPSO Phase   
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    更新时间：2026-04-22

    WU Bei, XIONG Jingpeng, GU Lidong, DENG Junjun, LIU Yong

    DOI：10.15980/j.tzzz.Z20250013
    摘要：As one of representative materials for lightweighting， Mg-based materials are extensively applied in various industries. As an effective method for forming Mg-based materials， semi-solid die casting has been developed for over five decades and comes to categories of rheo-forming and thixo-forming branches， which is previously hindered by limitations in materials， equipment， and process control. In recent years， the increscent demand for lightweighting and development of rheology-based injection molding machines greatly accelerate the industrialization of semi-solid die casting forming of Mg-based materials. The method and process of semi-solid die casting for Mg-based materials were reviewed， and relevant research was summarized. Common injection defects in thixo-forming semi-solid die castings as well as solutions were identified.  
    关键词：Mg-based Materials;Injection Forming;Semi-Solid Die Casting   
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    更新时间：2026-04-22

    LU Yuming, GUO He, HU Wenxin, HE Wei, LIU Feng, WANG Xinyuan, YANG Zhenghua

    DOI：10.15980/j.tzzz.T20250229
    摘要：The effect of synergistic effect of Y and Nd elements on corrosion resistance of Mg-Zn-Gd alloys was investigated. The results demonstrate that Nd addition promotes the formation of Mg41Nd5 phase， refining the grain size. However， the large potential difference （approximately 130 mV） between the second phase and Mg matrix leads to a deterioration in corrosion performance. Y addition effectively suppresses Nd diffusion within the alloy matrix， improving the corrosion resistance， especially at 9%， where the formation of long-period stacking ordered （LPSO） phases result in a progressive rise in corrosion resistance. After T4 solution treatment， the overall corrosion behavior of alloys is enhanced， and the corrosion mechanism remains consistent with that of as-cast one. Desirable corrosion resistance is achieved with 9% Y addition， which is attributed to the formation of a uniform and dense oxide film that effectively prevents localized corrosion and hydrogen evolution during the corrosion process. In conclusion， the synergistic effect of Y and Nd can significantly improve the corrosion resistance of Mg alloys， particularly in aspect of optimizing morphology of second phase and raising repair capability of oxide film.  
    关键词：Mg-Zn-Gd Alloy;Corrosion Resistance;LPSO Phase   
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    更新时间：2026-04-22

    WANG Xiaoming, XU Lin, CAI Zenghui, KANG Hongyan, YANG Guangshan, LI Yongjun, NING Zhiliang

    DOI：10.15980/j.tzzz.T20250041
    摘要：The hot tearing susceptibility and formation mechanism of EV31， WE43， and independently developed DAM1 high-strength alloys were investigated using thermal analysis， ProCAST numerical simulation， and constrained solidification tests with T-shaped specimens. The results reveal that EV31 alloy exhibits desirable hot tearing susceptibility， followed by WE43， and DAM1 possesses the lowest susceptibility. EV31 suffers from a high dendrite coherency temperature and poor feeding capability， leading to severe initiation and propagation of hot crack. WE43 benefits from early second-phase precipitation， while low residual liquid fraction limits crack healing. In contrast， DAM1 possesses the lowest dendrite coherency temperature and the highest second-phase content with moderate temperature， promoting abundant intergranular bridging and prolonged feeding channels， effectively alleviating shrinkage stress accumulation and suppressing hot tearing susceptibility. The intrinsic relationship between second-phase evolution and hot tearing behavior was elucidated， providing guidance for alloy design and casting process optimization of Mg-RE alloys.  
    关键词：Mg-RE Alloys;Hot Tearing Susceptibility;Numerical Simulation;Formation Mechanism   
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    更新时间：2026-04-22

    JIANG Aoxue, YOU Zhiyong, SUN Chunle, JIN Shuaishuai, HAN Peide, WANG Kaiying

    DOI：10.15980/j.tzzz.H20250012
    摘要：Mg-Zn-Ce alloys with different Zn contents were fabricated via rapid solidification and T6 treatment. The results indicate that the grain size of Mg-5Zn-0.2Ce alloy is coarsened from 107 μm to 310 μm after T6 treatment， accompanied with remelting recrystallization at grain boundaries. The size and volume fraction of precipitate reach 16.87 nm and 2.939%， respectively. For Mg-7Zn-0.3Ce alloy， the grain size is transofromed from 106 μm to 110 μm with insignificant coarsening， while the size and volume fraction of precipitate are increased to 21 nm and 18.116%， respectively. After T6 heat treatment， Mg-7Zn-0.3Ce alloy exhibits a tensile strength of 215.95 MPa， a yield strength of 177.87 MPa， and an elongation of 4.04%. The yield strength is increased by 17.01 MPa compared with that of as-cast ones， while the calculated increment of yield strength contributed by precipitates is 23.07 MPa， indicating the 100% contribution rate of precipitates to yield strength， which reflects the importance of age-precipitated coherent precipitates on mechanical properties of Mg-Zn alloys with high Zn contents.  
    关键词：T6 Heat Treatment;Precipitates;Strengthening Mechanism;Microstructure;Mechanical Properties   
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    更新时间：2026-04-22
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