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Effect of Sn content on strain hardening behavior of as-extruded Mg-Sn alloys

机译：Sn含量对挤压Mg-Sn合金应变硬化行为的影响

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摘要

The effects of Sn content on strain hardening behavior of as-extruded Mg-xSn (x = 1.3, 2.4, 3.6 and 4.7 wt%) binary alloys were investigated by uniaxial tensile tests at room temperature. Strain hardening rate, strain hardening exponent and hardening capacity were obtained from the true plastic stress-strain curves. After hot extrusion, the as-extruded Mg-Sn alloys are mainly composed of α-Mg matrix and second phase Mg_2Sn, which only exists in Mg-3Sn and Mg-4Sn. Average grain size decreases from 15.6 urn to 3.6 μm with Sn content increases from 1.3 to 4.7 wt%. The experimental results show that Sn content decreases strain hardening ability of as-extruded Mg-Sn alloys, but gives rise to an obvious elevation in tensile strength, yield strength and elongation of them. With increasing Sn content, strain hardening rate decreases from 3527 MPa to 1211 MPa at (σ-σ_(0.2)) = 50 MPa, strain hardening exponent decreases from 0.21 to 0.13 and hardening capacity decreases from 1.66 to 0.63. The variation in strain hardening behavior of Mg-Sn alloys with Sn content is discussed in terms of the influences of grain size and distribution of grain orientation.
机译：通过室温下的单轴拉伸试验研究了Sn含量对挤压Mg-xSn（x = 1.3、2.4、3.6和4.7 wt％）二元合金的应变硬化行为的影响。由真实的塑性应力-应变曲线获得应变硬化速率，应变硬化指数和硬化能力。热挤压后，刚挤压出的Mg-Sn合金主要由α-Mg基体和仅存在于Mg-3Sn和Mg-4Sn中的第二相Mg_2Sn组成。平均晶粒尺寸从15.6 n减小到3.6μm，Sn含量从1.3 wt％增大到4.7 wt％。实验结果表明，Sn含量降低了挤压态的Mg-Sn合金的应变硬化能力，但显着提高了它们的拉伸强度，屈服强度和伸长率。随着Sn含量的增加，在（σ-σ_（0.2））= 50 MPa时，应变硬化速率从3527 MPa降低至1211 MPa，应变硬化指数从0.21降低至0.13，硬化能力从1.66降低至0.63。从晶粒尺寸和晶粒取向分布的影响出发，讨论了含Sn的Mg-Sn合金的应变硬化行为的变化。

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  • 来源
    《Materials Science and Engineering》 |2018年第24期|244-252|共9页
  • 作者

    Chaoyue Zhao; Xianhua Chen; Fusheng Pan; Shangyu Gao; Di Zhao; Xiaofang Liu;

  • 作者单位

    College of Materials Science and Engineering, Chongqing University, Chongqing 400045, PR China;

    College of Materials Science and Engineering, Chongqing University, Chongqing 400045, PR China,Key Laboratory of Superlight Materials & Surface Technology (Harbin Engineering University), Ministry of Education, Harbin 150001, PR China;

    College of Materials Science and Engineering, Chongqing University, Chongqing 400045, PR China,Chongqing Academy of Science and Technology, Chongqing 401123, PR China;

    College of Materials Science and Engineering, Chongqing University, Chongqing 400045, PR China;

    College of Materials Science and Engineering, Chongqing University, Chongqing 400045, PR China;

    College of Materials Science and Engineering, Chongqing University, Chongqing 400045, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mg-Sn alloy; Strain hardening; Grain size; Dislocation; Grain orientation;

    机译：镁锡合金应变硬化;晶粒大小;错位;晶粒取向;

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