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Improved age-hardening behavior of Mg-Sn-Mn alloy by addition of Ag and Zn

机译：通过添加Ag和Zn改善Mg-Sn-Mn合金的时效硬化行为

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摘要

The effect of 0.5 at% Ag and its combination with 0.4 at% Zn on the precipitation hardening behavior of Mg-l.5Sn-0.5Mn (at%) alloy have been investigated using hardness measurements and transmission electron microscopy (TEM). The results show that sole addition of Ag can remarkably improve the peak hardness from 58HV to 77HV after ageing at 200 ℃, which is attributed to the increased number density, the size and so the volume fraction of the Mg_2Sn lath precipitates. A combination addition of Ag and Zn further improves the peak-hardness to 83HV and the time to peak hardness has been reduced from 120h to 100 h. The joint addition of Ag and Zn both increases the number density and refines the Mg_2Sn precipitates. Zn also promotes the Mg_2Sn precipitates lying on the non-basal plane of matrix, as well as the blocky Mg_(54)Ag_(17) phase which has an orientation relationship with α-Mg matrix as (001)_ε'//(0001)_α, [200]_ε,//[-l -1 20]_α, [0-20]_ε,//[l -100]_α. In the peak-aged Ag modified alloys, Ag atoms are segregated in the Mg2Sn precipitates. Nucleation, growth and coarsening of the Mg_2Sn precipitates simultaneously occur as the ageing proceeds. The growth of Mg_2Sn precipitates exhibits a significant anisotropic behavior. Addition of Ag can promote the precipitation process during the underage period and retarding the growth of Mg_2Sn during the overage period, leading to a more thermal stable microstructure of the Ag and Ag + Zn modified alloys, from which only a small hardness decrease after 700 h ageing is detected.
机译：使用硬度测量和透射电子显微镜（TEM）研究了0.5 at％Ag及其与0.4 at％Zn的组合对Mg-1.5Sn-0.5Mn（at％）合金的沉淀硬化行为的影响。结果表明，单独添加Ag可以显着提高200℃时效后的峰值硬度从58HV到77HV，这归因于Mg_2Sn板条沉淀物的数量密度，尺寸和体积分数的增加。 Ag和Zn的组合添加进一步将峰硬度提高到83HV，并且达到峰硬度的时间从120h减少到100h。 Ag和Zn的共同添加都增加了数密度并细化了Mg_2Sn沉淀。 Zn还促进了位于基质非基面上的Mg_2Sn沉淀以及块状Mg_（54）Ag_（17）相与α-Mg基质的取向关系为（001）_ε'//（0001） ）_α，[200]_ε，// [-1 -1 20]_α，[0-20]_ε，// [l -100]_α。在峰值时效的Ag改性合金中，Ag原子偏析在Mg2Sn沉淀物中。随着老化的进行，Mg_2Sn析出物同时发生形核，生长和粗化。 Mg_2Sn沉淀物的生长表现出明显的各向异性行为。 Ag的添加可以促进未成年期的析出过程，并延缓Mg_2Sn的生长，从而使Ag和Ag + Zn改性合金的热稳定性更好，在700 h后硬度只有很小的降低。检测到老化。

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  • 来源
    《Materials Science and Engineering》 |2012年第30期|p.211-221|共11页
  • 作者

    X.-F. Huang; W.-Z. Zhang;

  • 作者单位

    Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

    Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

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

    magnesium alloy; age-hardening; TEM; micro-alloying; Ag;

    机译：镁合金时效性TEM;微合金化银;

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