Modifying microstructures and tensile properties of Mg-Sm based alloy via extrusion ratio

Kai Guan; Rui Ma; Jinghuai Zhang; Ruizhi Wu; Qiang Yang; Jian Meng

Journal of Magnesium and Alloys (May 2021)

Modifying microstructures and tensile properties of Mg-Sm based alloy via extrusion ratio

Kai Guan,
Rui Ma,
Jinghuai Zhang,
Ruizhi Wu,
Qiang Yang,
Jian Meng

Affiliations

Kai Guan: 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; Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan; State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China
Rui Ma: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China
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.
Ruizhi Wu: 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
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. 9, no. 3
pp. 1098 – 1109

Abstract

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Microstructure and tensile properties of a Mg-Sm-Zn-Zr alloy with various extrusion ratios (ERs) of 6.9, 10.4 and 17.6 were systematically investigated. It was identified that, greater ER increased dynamic recrystallization (DRX) fraction and coarsened DRX grains, which further suggests weakened basal fiber texture for the studied alloy. This is mainly due to the rising temperature from massive deformation heat when hot-extrusion. As a result, greater ER corresponds to a decreased strength but improved ductility. Finally, transmission electron microscopy (TEM) observations reveal that the dominant intermetallic phase, Mg3Sm, is metastable, and it will transform into Mg41Sm5 during extrusion with high-ER. This transformation leads to the accumulation of surplus Sm and Zn atoms, which induces the precipitation of SmZn3 phase at the surface of Mg41Sm5 matrix.

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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