Effect of Bi on Microstructure and Mechanical Properties of Extruded AZ80-2Sn Magnesium Alloy

• Main Authors: Xue Hansong, Li Xinyu, Zhang Weina, Xing Zhihui, Rao Jinsong, Pan FuSheng
• Format: Article
• Language: English
• Published: De Gruyter 2018-01-01
• Series: High Temperature Materials and Processes
• Subjects: magnesium alloy; bismuth; microstructure; mechanical properties
• Online Access: https://doi.org/10.1515/htmp-2016-0045

The effects of Bi on the microstructure and mechanical properties of AZ80-2Sn alloy were investigated. The results show that the addition of Bi within the as-cast AZ80-2Sn alloy promotes the formation of Mg3Bi2 phase, which can refine the grains and make the eutectic phases discontinuous. The addition of 0.5 % Bi within the as-extruded AZ80-2Sn alloy, the average grain size decreases to 12 μm and the fine granular Mg17Al12 and Mg3Bi2 phases are dispersed in the α-Mg matrix. With an increase in Bi content, the Mg17Al12 and Mg3Bi2 phases become coarsened and the grain size increases. The as-extruded AZ80-2Sn-0.5 %Bi alloy has the optimal properties, and the ultimate tensile strength, yield strength and elongation are 379.6 MPa, 247.1 MPa and 14.8 %, respectively.