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杨秋荣,曾迎,周明扬,黄广号,任凌宝,陆嘉伟,尹冬弟,蒋斌.微量Y(0.2 wt.%)对铸造Mg-Sn合金热变形行为影响[J].稀有金属材料与工程(英文),2019,48(7):2275~2283.[Yang Qiurong,Zeng Ying,Zhou Mingyang,Huang Guanghao,Ren Lingbao,Lu Jiawei,Yin Dongdi and Jiang Bin.Effect of Yttrium Addition (0.2 wt.%) on the Hot Compression Behavior of the As-cast Mg-Sn Alloy[J].Rare Metal Materials and Engineering,2019,48(7):2275~2283.]
Effect of Yttrium Addition (0.2 wt.%) on the Hot Compression Behavior of the As-cast Mg-Sn Alloy
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Received:January 25, 2018  Revised:March 12, 2018
DOI:
Key words: Y content  Mg-Sn alloy  thermal deformation behavior  deformation mechanisms  processing map
Foundation item:中央高校基本科研业务费科技创新项目(2682016CX072) 四川省国际科技合作与交流研发项目(18GJHZ0073)
Author NameAffiliation
Yang Qiurong,Zeng Ying,Zhou Mingyang,Huang Guanghao,Ren Lingbao,Lu Jiawei,Yin Dongdi and Jiang Bin  
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Abstract:
      The uniaxial hot compression tests of casting Mg-2.5Sn (wt.%) and Mg-2.5Sn-0.2Y (wt.%) alloys were conducted on an MTS-CMT5I05 universal testing machine at temperatures ranging between 250~400℃ and the strain rate of 10-4~10-1 s-1 with strain of 40%. The effect of yttrium (Y) addition content (0.2 wt.%) on the hot compression behavior of the casting Mg-Sn alloys were investigated by true stress-strain curves, peak stress, microstructures, constitutive equation, and DMM processing maps. Results showed that the Y addition increased the peak stress of 30% at low strain rate, but made any sense at high strain rate. Deformation mechanism was changed from the lattice diffusion to dislocation slip and climb. In addition, Y retarded the dynamic recrystallization, reduced the efficiency of power dissipation and expanded the flow instability area.