The formation mechanism of the lamellar phase precipitated during solid solution treatment in the Mg-Gd-Al alloy

Yongpeng Zhuang; Pengwen Zhou; Hongxia Wang; Kaibo Nie; Yiming Liu; Wei Liang; Lifei Wang; Liuwei Zheng

Journal of Materials Research and Technology (Sep 2020)

The formation mechanism of the lamellar phase precipitated during solid solution treatment in the Mg-Gd-Al alloy

Yongpeng Zhuang,
Pengwen Zhou,
Hongxia Wang,
Kaibo Nie,
Yiming Liu,
Wei Liang,
Lifei Wang,
Liuwei Zheng

Affiliations

Yongpeng Zhuang: Shanxi Key Laboratory of Advanced Magnesium based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Pengwen Zhou: Shanxi Aerospace Qinghua Equipment Co., Ltd., Changzhi 046012, China
Hongxia Wang: Shanxi Key Laboratory of Advanced Magnesium based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan Shanxi 030024, China; Corresponding authors.
Kaibo Nie: Shanxi Key Laboratory of Advanced Magnesium based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yiming Liu: Shanxi Key Laboratory of Advanced Magnesium based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Wei Liang: Shanxi Key Laboratory of Advanced Magnesium based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan Shanxi 030024, China
Lifei Wang: Shanxi Key Laboratory of Advanced Magnesium based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Liuwei Zheng: Shanxi Key Laboratory of Advanced Magnesium based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Corresponding authors.

Journal volume & issue: Vol. 9, no. 5
pp. 11392 – 11401

Abstract

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A large amount of lamellar phases were precipitated in Mg-9Gd-xAl (x = 0.4, 0.6, 0.8, 1.0, 3.0 wt.%) alloy after solution treatment. In order to explore the composition and formation condition of the lamellar phase, the Mg-9Gd-xAl alloys were subjected to solution treatment at different time, then the influence of lamellar phase on mechanical properties was investigated in Mg-9Gd-xAl alloys. The results indicate that the lamellar phase consists of three elements, Mg, Al, and Gd, and the atomic ratio is close to 1:1:1. It was identified that the lamellar phase is (Mg, Al)2Gd phase which has the same crystal structure with Al2Gd. In addition, the lamellar phases were parallel to each other inside one grain, but the alignment directions inside the adjacent grains were different, which provide strong second phase strengthening effect. After solution treatment, the ultimate tensile strength of Mg-9Gd-0.6Al alloy with abundant lamellar phase is greatly improved to 193 MPa.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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