中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 21 No. 4 April 2011 |
mechanical properties of AZ80 magnesium alloy
(1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. New Materials Research Institute, Shandong Academy of Sciences, Ji’nan 250014, China)
Abstract:The effects of Bi addition on the microstructures and mechanical properties of as-cast AZ80 alloy were investigated. The results show that with the addition of Bi, the coarse eutectic phases are refined and become discontinuous; some flaky and granular Mg3Bi2 phases with a hexagonal structure of D52 are observed along the grain boundaries and between dendrites. The tensile strength and elongation increase first, and then decrease with increasing Bi content. AZ80-0.5%Bi alloy has optimum combination mechanical properties. When the content of Bi is above 1.0% (mass fraction), the amount of flaky Mg3Bi2 phase increases markedly, which splits the matrix and deteriorates the tensile strength and elongation.
Key words: AZ80 magnesium alloy; bismuth; microstructure; mechanical property