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题名: Hot Extrusion Effect on the Microstructure and Mechanical Properties of a Mg-Y-Nd-Zr Alloy
作者: Sheng, LY;  Du, BN;  Wang, BJ;  Xu, DK;  Lai, C;  Gao, Y;  Xi, TF
发表日期: 2018
摘要: Mg-Zn-Y-Nd alloy was prepared by casting and hot extrusion. The microstructure and mechanical properties of OM, SEM, XRD, TEM, and tensile tests were investigated with casting and hot extruded alloys. The results demonstrate that in a casting Mg-Y-Nd-Zr alloy, the alpha-Mg matrix is separated into the cell structure by a discontinuously distributed coarse Mg24Y5/alpha-Mg eutectic structure and fine Mg12Nd particles. TEM analysis shows that the Mg12Nd and Mg24Y5 phases have the orientation of , and and , respectively. The hot extrusion separates the Mg24Y5/alpha-Mg eutectic structure into fragments and aligns fragmentary Mg24Y5 particles along the extrusion direction. The interaction of hot extrusion and strengthening particles refines the alpha-Mg matrix greatly. Moreover, large strains result in the stacking faults of the matrix. As compared to the casting alloy, the hot-extruded one exhibits high yield strength, ultimate tensile strength, and elongation, which should be ascribed to the grain fineness, optimum distribution of strengthening particles and multiple substructures.
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Recommended Citation:
Sheng, LY,Du, BN,Wang, BJ,et al. Hot Extrusion Effect On The Microstructure And Mechanical Properties Of A Mg-y-nd-zr Alloy[J]. Strength Of Materials,2018,50(1):184-192.

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