Journal Article

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

Xu, Jing, Huang, Zheng Hua, Li, Yang De, Zhou, Nan, Li, Wei Rong

2017

Overview

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 σb 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.

• Publisher: Trans Tech Publications Ltd
• Subject: Alloys / Aluminum / Ambient temperature / Casting alloys / Dynamic recrystallization / Elongation / Grain size / Hot extrusion / Magnesium base alloys / Mechanical properties / Mechanical tests / Microstructure / Optical microscopy / Plates / Rods / Tensile strength / Yield strength / Yield stress