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Journal of Materials Engineering and Performance

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29-05-2018

Microstructure and Mechanical Properties of a Ag Micro-Alloyed Mg-5Sn Alloy

Author: S. H. Huang

Published in: Journal of Materials Engineering and Performance | Issue 7/2018

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Abstract

Effects of 1.5 wt.% Ag addition and solid solution + artificial ageing at 160 °C on the microstructure and mechanical properties of a Mg-5Sn alloy have been studied. The results show that Ag addition has significantly hardened the solution-treated Mg-5Sn alloy. During the ageing process, the hardness increase rate and the strength and ductility of the Mg-5Sn alloy at each state are also improved by Ag addition. The improved strengthening behavior is primarily attributed to the refinement distribution of the Mg₂Sn precipitates, the enhanced precipitation process, and the synergistic strengthening effect of Mg₂Sn and a metastable plate DO₁₉ phase formed at lower ageing temperature. For each solution-treated alloy, the strength and ductility are higher than the corresponding cast ones. Ageing further enhances the yield strength, and the ductility of the Mg-5Sn-1.5Ag alloy is also increased after ageing. The fracture surfaces of the both peak-aged alloys exhibit the characteristic of a mixture of quasi-cleavage and ductile fracture.

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Title: Microstructure and Mechanical Properties of a Ag Micro-Alloyed Mg-5Sn Alloy
Author: S. H. Huang
Publication date: 29-05-2018
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 7/2018
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-018-3433-4

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