Using friction stir processing to produce ultrafine-grained microstructure in AZ61 magnesium alloy |
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| Authors: | DU Xing-hao WU Bao-lin |
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| Affiliation: | Department of Materials Engineering, Shenyang Institute of Aeronautical Engineering, Shenyang 110034, China |
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| Abstract: | In order to obtain fine-microstructure magnesium alloys with superior mechanical properties, AZ61 alloy was processed by friction stir processing (FSP) combined with rapid heat sink. It is found that ultrafine-grained microstructure with average size less than 300nm is observed in the resultant AZ61 alloy. The mean microhardness of the ultra-fine region reaches Hv l20-130. two times higher than that of AZ61 substrate. All these results demonstrate clearly that under a cooling rate high enough, ultra-fine structure in AZ61 alloy with superior mechanical properties call be produced by one pass FSP via dynamic recrystallization. |
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| Keywords: | magnesium based alloys AZ61 alloy friction stir processing ultrafine-grained microstructure |
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