Microstructure and Mechanical Property of Mg-Sn-Al Wrought Magnesium Alloys

Abstract:

The microstructures, phase constitutions and mechanical properties of as-cast samples, extruded rods and plates of Mg-3.52Sn-3.32Al and Mg-6.54Sn-4.78Al alloys were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction and mechanical testing. The results show that as-cast microstructure consists of α-Mg matrix, Mg₂Sn and a few dispersed β-Mg₁₇Al₁₂ phases. The two as-cast alloys exhibit good tensile mechanical properties. After hot extrusion, dynamic recrystallization occurs. Average grain size reaches 6 μm ~ 8 μm for rods, and a lot of fine micro-scaled particles exist, resulting in significant enhancement of tensile mechanical properties. The extruded Mg-3.52Sn-3.32Al rod exhibits better comprehensive tensile mechanical property than AZ31B alloy, with tensile strength σ_b of 295 MPa, yield strength of 200 MPa and elongation of 21.5% at ambient temperature. The extruded Mg-6.54Sn-4.78Al rod exhibits equivalent comprehensive tensile mechanical properties with ZK60 alloy, achieving tensile strength of 355 MPa, yield strength of 275 MPa and elongation of 11% at ambient temperature. The extruded plates at ambient temperature performed a tensile strength of 270 MPa.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 97-103
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.97
• Online since: June 2017
• Authors: Zheng Hua Huang, Nan Zhou, Jing Xu, Yang De Li, Wei Rong Li
• Keywords: Mechanical Properties, Mg-Sn-Al Alloy, Microstructure, Wrought Magnesium Alloy

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