Effect of Mg2Si phase on microstructure and mechanical properties of as-extruded AZ31 magnesium alloy

doi:10.13251/j.issn.0254-6051.2020.04.008

Abstract

Abstract: Mg₂Si phase was introduced into AZ31 magnesium alloy by replacing Al with Al-Si master alloy combined with hot extrusion. Effect of Mg₂Si phase on the microstructure and mechanical properties of AZ31 magnesium alloy was studied by optical microscope (OM), scanning electron microscopy (SEM), X-ray diffraction analysis (XRD) and electronic universal testing machine.The results show that the Mg-3(Al-Si)-Zn extrusion microstructure presents obvious bimodal distribution, and the Mg₂Si particle phase can promote dynamic recrystallization by particle stimulated nucleation (PSN), and the microstructure is refined dramatically around Mg₂Si particles. The yield and tensile strength of Mg-3(Al-Si)-Zn alloy are improved to 175 MPa and 269 MPa, respectively, while the elongation decreases slightly after the introduction of Mg₂Si strengthening phase.

Key words: AZ31 magnesium alloy, Mg₂Si strengthening phase, microstructure, mechanical properties

CLC Number:

TG146.2

Zheng Liuwei, Liang Wei, Zhang Huiyun, Nie Huihui, Hao Xinwei. Effect of Mg₂Si phase on microstructure and mechanical properties of as-extruded AZ31 magnesium alloy[J]. Heat Treatment of Metals, 2020, 45(4): 40-44.

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Effect of Mg₂Si phase on microstructure and mechanical properties of as-extruded AZ31 magnesium alloy

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