OALib Journal期刊
Mg-Zn-Ca系富Mg区域三元化合物及其固态相平衡
DOI: 10.3724/SP.J.1037.2010.00638
Keywords: Mg-Zn-Ca系 ,三元化合物 ,结构与成分 ,相平衡
Abstract:
利用SEM,EPMA,XRD和TEM对Mg-Zn-Ca系富Mg区域三元化合物的成分、结构及其相平衡进行了研究.结果表明,Mg-Zn-Ca系富Mg区域存在2个可与镁基固溶体相平衡的三元化合物T1和T2.其中化合物T1为线性化合物,成分(原子分数,%,下同)为Ca约16,Zn16.8-49.5,Mg余量;晶体结构为六方结构,晶格常数随Zn含量的增大而减小,a=0.995-0.945nm,c=1.036-1.003nm.T2相的成分范围为Mg27.1-29.3,Zn62.1-64.4和Ca7.6-9.0;也为六方结构,晶格常数a=1.475nm和c=0.879nm.335℃时,Zn的加入并未使得镁基固溶体对Ca的溶解度降低,但Ca元素提高了Zn在镁基固溶体中的溶解度,Zn达到4.6.335℃时,Mg-Zn-Ca系相图富Mg区域存在着三相区α-Mg+Mg2Ca+T1,α-Mg+T1+T2,α-Mg+T2+MgZn,MgZn+T2+Mg2Zn3和α-Mg+Mg7Zn3+MgZn.
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