Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 21    No. 4    April 2011

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Effect of Bi addition on microstructures and
mechanical properties of AZ80 magnesium alloy
WANG Ya-xiao1, ZHOU Ji-xue2, WANG Jie1, LUO Tian-jiao1, YANG Yuan-sheng1, 2

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

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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