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. 25    No. 2    February 2015

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Microstructure and mechanical properties of AZ61 magnesium alloy prepared by repetitive upsetting-extrusion
Yan XU1,2, Lian-xi HU1, Yu SUN1, Jian-bo JIA1,2, Ju-fu JIANG1, Qing-guo MA3

1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. School of Mechanical Engineering, Beihua University, Jilin 132021, China;
3. Shenzhen Pingjin Corporation, Shenzhen 518000, China

Abstract:The process of repetitive upsetting-extrusion (RUE) was used to achieve severe plastic deformation (SPD) for an as-cast AZ61 magnesium alloy in temperature range of 285-380 °C. The microstructure and mechanical properties of the as-cast and RUE processed AZ61 alloys were investigated. The results indicated that homogeneous fine-grained structure with mean grain size of 3.5 μm was obtained as the accumulated true strain in the axial direction increased to 4.28 after three RUE passes at 285 °C. The dominant reason of grain refinement was considered the dynamic recrystallization induced by strain localization. It was also found that the microstructural evolution was affected by temperature and accumulated deformation. The mechanical properties of RUE processed AZ61 alloys were significantly improved owing to grain refinement. Furthermore, the relationship between deformation parameters and mechanical properties of AZ61 alloy prepared by RUE processing was revealed by tensile tests carried out at room temperature.


Key words: AZ61 magnesium alloy; repetitive upsetting-extrusion; severe plastic deformation; grain refinement; mechanical properties

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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