摘要
采用普通凝固技术制备了镁合金稳定态准晶相。通过光学显微镜、X射线衍射、扫描和透射电子显微分析,确定了准晶的组织、相成分及结构。实验结果发现:Mg Zn Y三元合金在室温冷却过程中,准晶相直接从液相形核、长大;当合金成分为Mg74Zn25Y1时,凝固组织为MgZn基体相、析出相为α Mg固溶体及二十面体Mg30Zn60Y10准晶相;当x(Y)为2%、3%时,合金中出现共析组织。
Stable icosahedral Zn_(60)Mg_(30)Y_(10) quasicrystals was prepared by as-cast method. The microstructure, composition and phases of the as-cast Mg-Zn-Y alloy are analyzed by optical microscope, SEM and EDS. The constituent phases are identified by XRD, and the quasicrystal structure is identified by TEM. Analyzing results show that the i-phases directly nucleate and grow from melt of cooling Mg-Zn-Y ternary alloys; the microstructures of the Mg_(74)Zn_(25)Y_1 alloy consist of α-Mg, MgZn and i-phase. When the mole fraction of yttrium reach 2% and 3%, the eutectoid microstructures are found in the Mg-Zn-Y alloys.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2004年第1期112-116,共5页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(50271054)
陕西省自然科学基金资助项目(2002E110)
教育部留学回国人员科研启动基金资助
