Microstructure and Properties of Mg-6Al-1Sn Alloy by Friction Stir Welding
YE Junhua1, TANG Aitao1, 2, MA Shida1, CHEN Qiaowang1, WANG Yurong1, XU Anlian1
1 College of Materials Science and Engineering, Chongqing University, Chongqing 400045; 2 National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044
Abstract: Mg-6Al-1Sn (AT61) magnesium alloy plates were successfully friction stir welded (FSW). The effect of different parameters on microstructure and properties were investigated. The results showed that the sound welded joints were obtained at the constant rotational rate of 1 200 r/min when the welding speed ranged from 60—180 mm/min and at the constant welding speed of 180 mm/min when the rotational rates ranged from 1 200—1 600 r/min, the best joint efficiency (i.e., a ratio of the UTS of joint to the UTS of BM) was 88%, and the hydrogen rate in nugget zone (NZ) was lower than base material (BM), but the electrochemistry performance was reduced. It was found that only Al8Mn5 phase was observed in BM, no Mg2Sn phase was detected. Compared with BM in microstructure, the type of secondary precipitates were insensitive to different welding parameters, and the distribution of secondary precipitates were transformed from strips into particles.
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2017, Vol. 31 
