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

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 16    No. 3    June 2006

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Effects of silicocalcium on microstructure and properties of Mg-6Al-0.5Mn alloy
WANG Li-guo(王利国), ZHANG Bao-feng(张保丰), ZHU Shi-jie(朱世杰),
ZHANG Mei(张 梅), ZHANG Chun-xiang(张春香), GUAN Shao-kang(关绍康)

School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China

Abstract:The effects of silicocalcium on the microstructure and mechanical properties of casting magnesium alloy Mg-6Al-0.5Mn(AM60) were studied. The results show that the microstructure of AM60 casting magnesium alloy is effectively refined by adding small amount of silicocalcium. The grain size decreases from 180 μm to 80 μm with 1.8% Si addition, while the size increases with 2.5% Si addition. The AM60+Si-Ca alloys mainly contain Mg matrix, β-Mg17Al12 phase, Al8Mn5 phase and a small polygonal type Mg2Si phase in matrix. Al8Mn5 can act as the heterogeneous nucleation for the Mg2Si phase. With the increase of silicocalcium, the content of Mg2Si phase increases gradually, the Mg2Si particles grow up and change coarse gradually. The microhardness of AM60 matrix increases with silicocalcium addition. The peak values of the tensile strength, elongation and impact toughness appear simultaneously with 1.8% silicocalcium addition, and the tensile strength, elongation and impact toughness are heightened respectively by 13.9%, 28.5% and 100%.

 

Key words: silicocalcium; magnesium alloy; AM60 alloy; microstructure; mechanical properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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