MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Phase Relations among D03, α-Mg, and Long-Period Stacking Orders in Mg85Zn6Y9 Alloy under 3 GPa
Masafumi MatsushitaYuya SakataTatsuya SenzakiMichiaki YamasakiIkuya YamadaHiroyuki SaitohToru ShinmeiTetsuo IrifuneNorimasa NishiyamaYoshihito Kawamura
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2015 Volume 56 Issue 7 Pages 910-913

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Abstract

The crystal structures of Mg85Zn6Y9 alloy under 3 GPa were investigated between room temperature and 973 K using in situ X-ray diffraction (XRD). In addition, the crystal structures and microstructures of Mg85Zn6Y9 alloys that were recovered after being heated at various temperatures under 3 GPa were also investigated. The in situ XRD analysis results indicated that 10H- and 18R-type long-period stacking orders (LPSOs) were stable below 673 K under 3 GPa; however, the D03 and α-Mg structures, which were not observed at ambient pressure, emerged at 873 K in the sample under 3 GPa. When the temperature was increased to 973 K, the D03 and α-Mg phases fused. The D03 and α-Mg phases were also confirmed to be present in Mg85Zn6Y9 alloy that was recovered after being heated at 873 K under 3 GPa. In contrast, the XRD pattern of the Mg85Zn6Y9 alloy that was recovered after being heated at 973 K under 3 GPa indicated the presence of the 18R-type LPSO, D03, and α-Mg structures. These results indicate that three phases—18R-type LPSO, D03, and α-Mg—were formed during cooling from the molten state at 3 GPa. These results further suggest that the D03, α-Mg, and 18R-type LPSO are energetically very similar under 3 GPa.

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© 2015 The Japan Institute of Metals and Materials
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