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Open AccessArticle

Effect of Zn and Ca Addition on Microstructure and Strength at Room Temperature of As-Cast and As-Extruded Mg-Sn Alloys

Key lab of advanced material design and additive manufacturing of Jiangsu Province, Jiangsu University of Technology, Changzhou 213001, China
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Materials 2018, 11(9), 1490; https://doi.org/10.3390/ma11091490
Received: 2 August 2018 / Revised: 18 August 2018 / Accepted: 18 August 2018 / Published: 21 August 2018
(This article belongs to the Section Structure Analysis and Characterization)
In this study, the effect of Zn and Ca addition on microstructure and strength at room temperature of Mg-Sn alloys was investigated by comparison of Mg-6Sn, Mg-6Sn-2Zn, and Mg-6Sn-2Zn-1Ca alloys in as-cast and as-extruded states. In the as-cast samples, α-Mg and Mg2Sn phases were the main phases of Mg-6Sn and Mg-6Sn-2Zn alloys, while the CaMgSn phase was formed in Mg-6Sn-2Zn-1Ca alloy due to the addition of the Ca element. Mg2Sn phase dissolved into the matrix during homogenization while CaMgSn phase remained. Incomplete dynamic recrystallization (DRX) took place in these alloys during hot extrusion. Fine Mg2Sn precipitates were observed in α-Mg matrix of as-extruded samples. Zn showed little influence on microstructure, whereas Ca reduced the volume fraction of un-DRXed grains and increased the size of DRXed grains. As-extruded Mg-Sn alloys exhibited typical fiber texture. The strength at room temperature of Mg-Sn alloys improved significantly after hot extrusion. The addition of Zn element was beneficial to the strength at room temperature of the Mg-6Sn alloy, while the further addition of Ca element was harmful to the strength. Among these alloys, the Mg-6Sn-2Zn alloy exhibited the best strength at room temperature in both as-cast and as-extruded states. View Full-Text
Keywords: Mg-Sn alloy; as-cast; hot extrusion; microstructure; strength at room temperature Mg-Sn alloy; as-cast; hot extrusion; microstructure; strength at room temperature
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Zhang, Y.; Song, L.; Chen, X.; Lu, Y.; Li, X. Effect of Zn and Ca Addition on Microstructure and Strength at Room Temperature of As-Cast and As-Extruded Mg-Sn Alloys. Materials 2018, 11, 1490.

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