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金属学报  2012 

Mg-Zn-Ca系低Ca侧400℃相平衡研究

DOI: 10.3724/SP.J.1037.2011.00486, PP. 70-75

Keywords: Mg-Zn-Ca系,液相,化合物,相平衡

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Abstract:

利用SEM,EPMA,XRD和DSC,对Mg-Zn-Ca系镁基固溶体400℃时的溶解度以及镁基固溶体与化合物之间的平衡相关系进行了研究.结果表明,在Mg-Zn系中加入Ca后,T1和T2相在400℃时依然是富Mg角的主要三元化合物,但只有T1相与镁基固溶体相平衡,且α-Mg+T1两相区明显缩小.400℃时,Mg-Zn-Ca系低Ca侧存在一个可与镁基固溶体相平衡的液相区,其含Ca量小于8.4%(原子分数);但Zn/Ca值小于1.7的三元合金中不会有液相存在.Mg-Zn-Ca系低Ca侧400℃等温截面相图中存在着4个三相区α-Mg+Mg2Ca+T1,α-Mg+T1+Liq,Liq+T1+T2和Liq+T2+Mg2Zn3.

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