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首页> 外文期刊>Materials Science and Engineering >The roles of Zn distribution and eutectic particles on microstructure development during extrusion and anisotropic mechanical properties in a Mg-Zn-Zr alloy
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The roles of Zn distribution and eutectic particles on microstructure development during extrusion and anisotropic mechanical properties in a Mg-Zn-Zr alloy

机译：锌分布和共晶颗粒在Mg-Zn-Zr合金挤压和各向异性力学性能过程中对显微组织发展的作用

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摘要

The effects of chemical segregation of Zn and eutectic particles in a DC-cast Mg-Zn-Zr alloy on the dynamic recrystallization (DRX) mechanism upon extrusion have been studied. The higher concentration of Zr in the mid-grains leads to an up-hill diffusion of Zn from grain boundaries to mid-grain regions during homogenization. The increased solubility of Zn after homogenization treatment is more critical for DRX during extrusion than the presence of Mg-Zn eutectic because it does not lead to particle stimulated nucleation (PSN). The higher Zn content in α-Mg after homogenization improves the DRX response and weakens the <10.0> fibrous texture. The compressive yield stress is not affected by the texture and solid solution strengthening and the large difference in tensile and compressive yield stress is mainly due to the texture strengthening during tensile loading. The presence of uniform elongation of the extrusions is significantly improved by 200% in the absence of eutectic particles.
机译：研究了直流铸造的Mg-Zn-Zr合金中Zn和共晶颗粒的化学偏析对挤压时动态重结晶（DRX）机理的影响。中粒中较高的Zr浓度会导致在均质化过程中Zn从晶界向上扩散到中粒区域。均质处理后增加的Zn溶解度比Mg-Zn共晶的存在对挤出过程中的DRX更为关键，因为它不会导致颗粒激发的成核（PSN）。均质化后，α-Mg中较高的Zn含量可改善DRX响应并削弱<10.0>纤维质构。压缩屈服应力不受织构和固溶体强化的影响，并且拉伸和压缩屈服应力的较大差异主要归因于拉伸载荷期间的织构强化。在不存在共晶颗粒的情况下，挤压件的均匀伸长率显着提高了200％。

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  • 来源
    《Materials Science and Engineering》 |2015年第3期|50-57|共8页
  • 作者

    M. Shahzad; H. Waqas; Rafi-ud-din; A.H. Qureshi; L. Wagner;

  • 作者单位

    Materials Division, Pakistan Institute of Nuclear Science & Technology, P.O. More, Islamabad, Pakistan;

    Materials Division, Pakistan Institute of Nuclear Science & Technology, P.O. More, Islamabad, Pakistan;

    Materials Division, Pakistan Institute of Nuclear Science & Technology, P.O. More, Islamabad, Pakistan;

    Materials Division, Pakistan Institute of Nuclear Science & Technology, P.O. More, Islamabad, Pakistan;

    Institute of Materials Science & Engineering, TU Clausthal, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Magnesium alloys; Recrystallization; Homogenization; Diffusion; Texture;

    机译：镁合金;重结晶;均质化扩散;质地;

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