Microstructure and Tensile Properties of Mg-4Zn-2Sn-2Al Alloy

Abstract:

The microstructures and tensile properties of as-cast, solution-treated and aged Mg-4Zn-2Sn-2Al (wt.%) alloy have been investigated. The microstructure of the as-cast alloy consists of α-Mg, Mg₂Sn and Mg₃₂(Al,Zn)₄₉ phases. The yield tensile strength and the ultimate tensile strength of the as-cast alloy are 87.7 MPa and 241.3 MPa, respectively, and the elongation reaches to 18.8% showing excellent ductility. After solution treatment, all of the Mg₃₂(Al,Zn)₄₉ phase and the majority of Mg₂Sn particles have dissolved into the matrix. During aging process, Mg₂Sn phase precipitates from the α-Mg supersaturated solid solution. With the precipitation strengthening of Mg₂Sn phase, the yield tensile strength and the ultimate tensile strength of the alloy increase to 112.5 MPa and 280.4 MPa, respectively, while, the elongation decreases to 12%.

• Periodical: Materials Science Forum (Volumes 747-748)
• Pages: 398-403
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.747-748.398
• Online since: February 2013
• Authors: Dong Qing Zhao, Xu Guang Dong, Xin En Zhang, An Jiang Gao, Ji Xue Zhou, Yuan Sheng Yang
• Keywords: Magnesium Alloy, Mg-4Zn-2Sn-2Al, Microstructure, Tensile Properties

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