感应熔炼法制备了Mg97Y2M1(M=Zn, Ni, Ag)合金, 运用TEM和SEM对铸态合金中的长周期堆垛结构(LPS)进行了分析. 结果表明, 铸态Mg97Y2 Zn 1中的LPS主要为6层周期堆垛, 但不同于理想的6H型堆垛结构; 在Mg97Y2Ni1中也存在LPS结构,与Mg97Y2Zn1相比, Mg97Y2Ni1中LPS具有较大的晶格畸变; Mg97Y2Ag1中未观察到LPS. 结合实验结果, 对影响LPS形成的因素进行了讨论.
Mg97Y2X1（at%,X= Zn,Ni,Ag）alloys were prepared by induction melting method and characteristic long period stacking structures(LPS) formed in these alloys studied by transmission electron microscopy and scanning electron microscopy. The results show that the LPS in the as-solidified Mg97Y2Zn1 can be described as a structure with a 6-layer stacking period, which is different from the typical LPS of the 6H type in a hcp structure. The existence of LPS in the Mg-Y-Ni system has been found for the first time. The lattice distortion in LPS structures occurs more often in the Mg-Y-Ni system than in the Mg-Y-Zn system. In contrast, no LPS structure is found to be formed in the Mg-Y-Ag sysyem. On the basis of experimental results, the factors affecting the formation of LPS structures in Mg97Y2X1 alloys are also discussed.
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