高温热处理对Mg_(82)Zn_(14.2)Y_(3.3)Zr_(0.5)合金中准晶相的影响

Effect of high temperature heat treatment on quasicrystal phase in Mg_(82)Zn_(14.2)Y_(3.3)Zr_(0.5)alloy

采用金相显微镜、扫描电子显微镜和X射线衍射及能谱分析等检测方法,研究了Mg82Zn14.2Y3.3Zr0.5合金在经过500℃固溶和320℃高温时效后的合金中准晶相的形态、含量、化学成分以及分布。结果表明,该合金的铸态组织中含有准晶相Mg3Zn6Y1(I相)和Mg3Zn3Y2(W相);经过固溶处理后W相消失;在时效过程中,在一段时间内I相的含量随着时间的延长而增加,当超过临界时间后I相的含量减少。观察发现,在所研究的合金中存在两组形态分别为花瓣状和鱼骨状的准晶相。

The methods of metallographic microscope,scanning electron microscope,X-ray and spectroscopy analyzer were used to study the morphology evolution,content,chemical composition and distribution of quasicrystalline phase in Mg82Zn14. 2Y3. 3Zr0. 5alloy after 500 ℃ solid solution treatment and 320 ℃ high temperature aging. The results show that the microstructure of cast alloy are consisted in quasicrystalline phase Mg3Zn6Y1( I-phase) and Mg3Zn3Y2( W-phase). The W-phase disappears after the solid solution treatment. In the aging process,over a period of time,the content of I-phase increases with time,when the aging time exceeds the critical time,I-phase content decreases with time. There are two kinds of morphology of quasicrystalline phase in the alloy,which are petal-like and fishbone-like respectively.