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采用光学显微镜、扫描电镜、X射线衍射和室温拉伸等检测技术研究了含微量锆和钇的Al-Zn-Mg-Cu合金的组织与力学性能。结果表明,在Al-Zn-Mg-Cu合金中复合添加微量(总量为0.35%)锆和钇,铸造组织中出现了Al3Y初生化合物,晶粒细小均匀。合金组织的再结晶被强烈抑制,再结晶组织的体积分数较小,晶粒被细化,合金的强度较单独添加锆或钇显著提高。但由于钇的加入使得基体中残留的较粗大化合物(S相)增多,导致合金的延伸率明显下降。
The microstructure and mechanical properties of Al-Zn-Mg-Cu alloy containing trace amounts of zirconium and yttrium were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction and room temperature tensile testing. The results show that the Al3Y primary compound appears in the microstructure of the Al-Zn-Mg-Cu alloy with a trace amount of zirconium and yttrium (0.35% in total) and the grains are fine and uniform. The recrystallization of the alloy is strongly inhibited, and the volume fraction of the recrystallized structure is smaller, and the grain is refined. The strength of the alloy is significantly increased compared with the addition of zirconium or yttrium alone. However, due to the addition of yttrium, the more coarse compound (S phase) remained in the matrix increased, resulting in a significant decrease in the elongation of the alloy.