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Mg-Al-Zn-Gd 4元系合金鋳造まま材におけるLPSO相の生成挙動

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Title: Mg-Al-Zn-Gd 4元系合金鋳造まま材におけるLPSO相の生成挙動
Other Titles: Formation of LPSO Phases in As-Cast Mg-Al-Zn-Gd Quaternary Alloys
Authors: 正岡, 和貴1 Browse this author
山田, 忠幸2 Browse this author
堀内, 寿晃3 Browse this author
糸井, 貴臣4 Browse this author
三浦, 誠司5 Browse this author →KAKEN DB
Authors(alt): Masaoka, Kazuki1
Yamada, Tadayuki2
Horiuchi, Toshiaki3
Itoi, Takaomi4
Miura, Seiji5
Keywords: magnesium alloy
long period stacking ordered
magnesium-aluminm-zinc-gadolinium quaternary alloy
formation type
Issue Date: 1-Aug-2019
Publisher: 日本金属学会
Journal Title: 日本金属学会誌
Journal Title(alt): Journal of the Japan Institute of Metals and Materials
Volume: 83
Issue: 8
Start Page: 257
End Page: 263
Publisher DOI: 10.2320/jinstmet.JBW201807
Abstract: Mg alloys with long period stacking ordered (LPSO) phases are categorized into two types. Mg alloys where the LPSO phase forms in as-cast state are categorized as Type I, while those where the LPSO phase does not appear in as-cast state but forms during heat treatment are categorized as Type II. However, the origin of the formation type of Mg alloys with LPSO phases still remains poorly understood. In the present study, three different Mg85(Al, Zn)6Gd9 quaternary alloys were prepared to elucidate the dominant factors that determine the formation type of Mg alloys with LPSO phases. The α-Mg, Al2Gd, Mg3Gd and LPSO phases were characterized in the as-cast quaternary alloys by microstructural observation, composition analysis and crystal structure analysis by using electron probe microanalysis and X-ray diffraction. It indicates that all the quaternary alloys are categorized as Type I even though the original two ternary Mg85Al6Gd9 and Mg85Zn6Gd9 alloys are categorized as Type II. The crystal structure of the LPSO phases observed in the as-cast alloys is considered to be 18R with dilute solute elements. The amount of the LPSO phases in the as-cast state increases with increasing the Zn content in the alloys. It is considered to be the cause of destabilization of the primary crystallized Al2Gd phase by the addition of Zn and hence relative stabilization of the LPSO phases. It is thus concluded that the relative phase stability in the vicinity of the LPSO phase is considered to be crucial for determination of the formation type of Mg alloys with LPSO phases.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 三浦 誠司

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