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Effects of Sn addition on dynamic recrystallization of Mg-5Zn-1Mn alloy during high strain rate deformation

机译：锡对高应变率变形Mg-5Zn-1Mn合金动态再结晶的影响

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摘要

Effects of Sn addition (0-1.5 mass%) on dynamic recrystallization (DRX) of Mg-5Zn-1Mn alloy during high strain rate (t = 9.1 s(-1)) deformation are investigated by hot compression testing. With a higher Sn addition, the strain corresponding to the maximum softening rate and the critical strain corresponding to the onset of DRX decrease at first and then increase, while the DRX fraction is just the reverse. The Mg-5Zn-1Mn-0.9Sn alloy shows the biggest DRX extent. Continuous DRX with twin nucleation is the dominant DRX mechanism for all the alloys. The high density dislocations inside twins gradually evolve into the cellular structures and sub-grains by dynamic recovery, and sub-grains turn into the DRX nuclei. The Sn addition can adjust the nucleation rate and the nucleus growth rate of DRX by regulating the inclination for twinning, adjusting stacking fault energy (SFE) and changing the amount of precipitates. Solute Sn atoms not only promote DRX nucleation by increasing twin density but also stimulate the DRX nucleus growth by reducing SFE. With the higher amount of MgZn2 and Mg2Sn dislocation-induced precipitates, the negative effect on DRX derived from the precipitates becomes effective, including hindering the formation of cellular structures and preventing the rotation and the growth of sub-grains by the pinning effect.
机译：通过热压缩试验研究了添加锡（0-1.5质量％）对高应变速率（t = 9.1 s（-1））变形期间Mg-5Zn-1Mn合金动态再结晶（DRX）的影响。随着锡的添加量增加，对应于最大软化速率的应变和对应于DRX发生的临界应变先减小然后增大，而DRX分数恰好相反。 Mg-5Zn-1Mn-0.9Sn合金具有最大的DRX程度。具有双成核作用的连续DRX是所有合金的主要DRX机制。双胞胎内部的高密度位错通过动态恢复逐渐演化为细胞结构和亚晶粒，而亚晶粒则成为DRX核。添加锡可以通过调节孪晶的倾角，调节堆垛层错能（SFE）和改变沉淀量来调节DRX的成核速率和核生长速率。溶质Sn原子不仅通过增加孪晶密度促进DRX成核，还通过降低SFE刺激DRX核的生长。随着MgZn2和Mg2Sn的位错诱导沉淀物含量增加，对沉淀物衍生的DRX的负面影响变得有效，包括阻碍细胞结构的形成以及通过钉扎效应防止亚晶粒的旋转和生长。

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  • 来源
    《Materials Science and Engineering》 |2018年第26期|49-60|共12页
  • 作者

    Zou Jiankun; Chen Jihua; Yan Hongge; Xia Weijun; Su Bin; Lei Yi; Wu Qin;

  • 作者单位

    Hunan Univ, Sch Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China|Hunan Univ, Hunan Prov Key Lab Spray Deposit Technol & Applic, Changsha 410082, Hunan, Peoples R China;

    Hunan Univ, Sch Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China|Hunan Univ, Hunan Prov Key Lab Spray Deposit Technol & Applic, Changsha 410082, Hunan, Peoples R China;

    Hunan Univ, Sch Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China|Hunan Univ, Hunan Prov Key Lab Spray Deposit Technol & Applic, Changsha 410082, Hunan, Peoples R China;

    Hunan Univ, Sch Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China|Hunan Univ, Hunan Prov Key Lab Spray Deposit Technol & Applic, Changsha 410082, Hunan, Peoples R China;

    Hunan Univ, Sch Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China|Hunan Univ, Hunan Prov Key Lab Spray Deposit Technol & Applic, Changsha 410082, Hunan, Peoples R China;

    Hunan Univ, Sch Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China;

    Hunan Univ, Sch Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Magnesium alloy; Sn; Dynamic recrystallization; Stacking fault energy;

    机译：镁合金;锡;动态再结晶;堆垛层错能;

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