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材料工程  2011 

稀土Nd对热挤压Mg-Y-Nd-Zr合金组织性能的影响

, PP. 35-41

Keywords: Mg-Y-Nd-Zr合金,热挤压,动态再结晶,力学性能

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Abstract:

采用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)和室温拉伸试验研究了稀土Nd对热挤压Mg-5.0Y-xNd-0.6Zr(x=0,1.0,2.6,4.2,质量分数/%,下同)合金微观组织和力学性能的影响。结果表明随着Nd加入量增大,挤压合金中带状分布的β和Mg24Y5相颗粒增多,促进了动态再结晶的形核,提高了再结晶体积分数,其平均晶粒尺寸由4.5μm细化到2.6μm。挤压合金的抗拉强度和屈服强度随着Nd加入量增大而升高,最高分别达到303MPa和262MPa,而延伸率和断面收缩率随Nd加入量增大而降低,其值分别从24.7%和39.9%降低到12%和16.7%。Nd加入量为2.6%时,挤压合金具有较好的综合性能。

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