Influence of Al Addition on the Microstructure and Mechanical Properties of Mg-Zn-Sn-Mn-Ca Alloys

Author:

Yan Shujuan1,Hou Caihong2,Zhang Angui1,Qi Fugang23ORCID

Affiliation:

1. National Energy Group Ningxia Coal Industry Co., Ltd., Yinchuan 750001, China

2. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China

3. Hunan Bangzer Technology Co., Ltd., Xiangtan 411100, China

Abstract

The effects of Al addition on the microstructure and mechanical properties of Mg-Zn-Sn-Mn-Ca alloys are studied in this paper. It was found that the Mg-6Sn-4Zn-1Mn-0.2Ca-xAl (ZTM641-0.2Ca-xAl, x = 0, 0.5, 1, 2 wt.%; hereafter, all compositions are in weight percent unless stated otherwise) alloys have α-Mg, Mg2Sn, Mg7Zn3, MgZn, α-Mn, CaMgSn, AlMn, Mg32(Al,Zn)49 phases. The grain is also refined when the Al element is added, and the angular-block AlMn phases are formed in the alloys. For the ZTM641-0.2Ca-xAl alloy, the higher Al content is beneficial to elongation, and the double-aged ZTM641-0.2Ca-2Al alloy has the highest elongation, which is 13.2%. The higher Al content enhances the high-temperature strength for the as-extruded ZTM641-0.2Ca alloy; overall, the as-extruded ZTM641-0.2Ca-2Al alloy has the best performance; that is, the tensile strength and yield strength of the ZTM641-0.2Ca-2Al alloy are 159 MPa and 132 MPa at 150 °C, and 103 MPa and 90 MPa at 200 °C, respectively.

Funder

Ningdong base science and Technology Innovation Development Special Project

National Natural Science Foundation of China

High Technology Research and Development Program of the Hunan Province of China

Publisher

MDPI AG

Subject

General Materials Science

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