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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
| 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 |
| URI: | http://hdl.handle.net/2115/75126 |
| 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)
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Submitter: 三浦 誠司
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