Microstructures and mechanical properties of as-cast Mg-Sm-Zn-Zr alloys with varying Gd contents

Kai Guan; Daisuke Egusa; Eiji Abe; Jinghuai Zhang; Xin Qiu; Qiang Yang; Jian Meng

Journal of Magnesium and Alloys (May 2022)

Microstructures and mechanical properties of as-cast Mg-Sm-Zn-Zr alloys with varying Gd contents

Kai Guan,
Daisuke Egusa,
Eiji Abe,
Jinghuai Zhang,
Xin Qiu,
Qiang Yang,
Jian Meng

Affiliations

Kai Guan: Department of Materials Science & Engineering, The University of Tokyo, Tokyo 113-8656, Japan; Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, PR China; Corresponding author at: Department of Materials Science & Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
Daisuke Egusa: Department of Materials Science & Engineering, The University of Tokyo, Tokyo 113-8656, Japan
Eiji Abe: Department of Materials Science & Engineering, The University of Tokyo, Tokyo 113-8656, Japan; Research Center for Structural Materials, National Institute for Materials Science, Tsukuba 305-0047, Japan
Jinghuai Zhang: Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, PR China; Corresponding authors.
Xin Qiu: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China
Qiang Yang: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; Corresponding authors.
Jian Meng: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China

Journal volume & issue: Vol. 10, no. 5
pp. 1220 – 1234

Abstract

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The effect of Gd content on the microstructure and tensile properties of as-cast Mg-Sm-Zn-Zr alloy has been systematically investigated. In the Mg-3Sm-0.5Zn-0.5Zr alloy, the intermetallic compounds with multiple morphologies are identified as Mg3Sm phase. In addition to Mg3RE phase, Mg5RE phase originated from Gd addition is observed in Gd-modified alloys. It should be noted that the lattice parameters of all the observed intermetallic compounds are significantly reduced by Zn segregation. The segregation behavior of Zn in Mg3Sm phase is inhibited to some extent by Gd addition due to the electronegativity difference between Sm/Gd and Zn elements. In addition, the increased Gd content effectively leads to much more accumulation of solute atoms in front of the liquid-solid interface during solidification, which can prominently promote nucleation in liquid region and then refine grains. The tensile yield stress of the present alloys is thus improved with increasing Gd addition. Finally, Gd-modified alloys exhibit significantly age-hardening effect, which can be mainly attributed to the high-volume fraction and high density nano-scale precipitates.

Published in Journal of Magnesium and Alloys

ISSN: 2213-9567 (Online)
Publisher: KeAi Communications Co., Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/journal-of-magnesium-and-alloys/

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