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微量Y(0.2 wt.%)对铸造Mg-Sn合金热变形行为影响
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1.西南交通大学 材料先进技术教育部重点实验室;2.重庆大学 国家镁合金材料工程技术研究中心

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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)


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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    摘要:

    采用MTS-CMT5105电子万能试验机,在温度为250~400℃、初始应变速率为10-4~10-1s-1,最大变形量为40%的条件下,对铸态Mg-2.5Sn(wt.%)和Mg-2.5Sn-0.2Y(wt.%)合金进行压缩变形。结合真应力-应变曲线、峰值应力、显微组织、本构方程、DMM加工图,研究了微量Y(0.2 wt.%)对铸造Mg-Sn合金热变形行为的影响。结果表明:微量Y的添加,在较低应变速率时,会使Mg-Sn合金热压缩峰值应力增加30%以上;但在较高应变速率时,却对其影响不大。会改变合金塑性变形机制的控制方式,即由扩散控制变为位错的滑移和攀移。会抑制动态再结晶。会降低功率耗散系数,扩大加工失稳区。

    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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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,2019,48(7):2275~2283.[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.]
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  • 收稿日期:2018-01-25
  • 最后修改日期:2018-03-12
  • 录用日期:2018-04-04
  • 在线发布日期: 2019-08-01
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