Ternary compounds and solid-state phase equilibria in Mg-rich side of Mg-Zn-Ca system at 300 ℃
Mg-Zn-Ca系富Mg侧三元化合物及其300℃固态相平衡(英文)作者机构:东北大学材料各向异性与织构教育部重点实验室沈阳110819
出 版 物:《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报(英文版))
年 卷 期:2011年第21卷第10期
页 面:2147-2153页
核心收录:
学科分类:0806[工学-冶金工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程(可授工学、理学学位)] 080502[工学-材料学] 0813[工学-建筑学] 0703[理学-化学] 0814[工学-土木工程] 0702[理学-物理学]
基 金:Project(50731002) supported by the National Natural Science Foundation of China Project(20082030) supported by the Natural Science Foundation of Liaoning Province,China
主 题:Mg-Zn-Ca system ternary compound structure composition phase equilibrium
摘 要:The phase equilibria and compositions in Mg-rich side at 300 ℃ were investigated in Mg-Zn-Ca ternary system through the equilibrated alloy method by using scanning electron microscopy,electron probe microanalysis,X-ray diffraction and transmission electron *** results show that two ternary compounds T1 and T2 can be in equilibrium with the Mg-based solid solution in Mg-Zn-Ca system.T1 phase is a linear compound with the composition region(molar fraction) of 15% Ca,20.5%-48.9% Zn and balanced Mg at 300 ℃.Its hexagonal structure parameters decrease with increasing Zn content,i.e.a=0.992-0.945 nm,c=1.034-1.003 nm.T2 phase has hexagonal structure with the composition region of 26.4%-28.4% Mg,63.2%-65.5% Zn and 7.1%-8.4% *** 300 ℃,the solubility of Zn in the Mg-based solid solution increases for the addition of Ca,the maximum solubility of Zn is 3.7%.Three-phase fields consisting of--Mg+Mg2Ca+T1,--Mg+T1+T2,--Mg+T2+MgZn and MgZn+T2+Mg2Zn3 exist in the Mg-Zn-Ca system at 300 ℃.