微量锆对Al-Mg-Sc合金力学性能与显微组织的影响

Influence of Minor Zr on Mechanical Properties and Microstructures of Al-Mg-Sc Alloy

制备了成分分别为Ａｌ５Ｍｇ（０．１０～０．３０）Ｓｃ和Ａｌ５Ｍｇ（０．１０～０．３０）Ｓｃ（０．０５～０１５）Ｚｒ的两种合金，测试了其不同状态下的拉伸力学性能σｂ、σ０２和δ，采用金相显微镜、透射电镜及扫描电镜观察分析了其不同状态下的显微组织结构。结果发现，微量锆的添加明显提高了ＡｌＭｇＳｃ合金的强度，细化了合金铸锭组织的晶粒尺寸，抑制了合金形变组织的再结晶。另外，对有关的作用机理进行了探讨研究。

The two kinds of alloys of Al5Mg(0.10～0.30)Sc and Al5Mg(0.10～0.30)Sc(0.05～0.15)Zr were made. Their tensile properties σb, σ0.2, δ were tested and microstructures were observed by optical microscope, transmission electronical microscope and scan electronical microscope. The results were showed that the addition of minor Zr raised the strength of Al-Mg-Sc alloys, fined the grain of alloy ingots and restrained the recrystallization of alloys. In addition, the mechanisms of those were studied and discussed.