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Effect of Yttrium Addition (0.2 wt.%) on the Hot Compression Behavior of the As-cast Mg-Sn Alloy
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1.Key Laboratory of Advanced Technologies of Materials,Ministry of Education of China,Southwest Jiaotong University,Chengdu;2.National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing

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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.

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[Yang Qiurong, Zeng Ying, Zhou Mingyang, Huang Guanghao, Ren Lingbao, Lu Jiawei, Yin Dongdi, 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.]
DOI:10.12442/j. issn.1002-185X.20180095

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History
  • Received:January 25,2018
  • Revised:March 12,2018
  • Adopted:April 04,2018
  • Online: August 01,2019
  • Published: