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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstructural analysis of plastically deformed icosahedral Zn-Mg-Dy single quasicrystals
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Microstructural analysis of plastically deformed icosahedral Zn-Mg-Dy single quasicrystals

机译：塑性变形二十面体Zn-Mg-Dy单准晶体的显微组织分析

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摘要

We present a detailed study of the microstructure of plastically deformed Zn-Mg-Dy single quasicrystals. Single quasicrystals grown using the self-flux technique were uniaxially deformed at strain rates of 10~(-5) and 10~(-6) s~(-1) in the temperature range between 490 and 530 deg C. Dislocations and planar defects in differently treated samples were analyzed using transmission electron microscopy. Antiphase boundaries (APBs) of the face-centered icosahedral structure were shown to be generated as a result of plastic deformation by moving partial dislocations. The determination of the APB planes, i.e. the planes of dislocation motion, along with an analysis of the Burgers vectors and the line directions of the dislocations attached to the APBs, allowed a detailed microstructural characterization on the mode of plastic deformation. Dislocations of 60 deg mixed-type were most frequently found. Slip occurs preferentially on planes that are inclined by an angle of almost 45 deg to the compression direction, i.e. planes of highest resolved shear-stress. It was shown that the mode of dislocation movement is mainly pure glide, though in some cases motion by climb was observed as well.
机译：我们目前对塑性变形的Zn-Mg-Dy单准晶体的微观结构进行详细研究。在490至530℃的温度范围内，使用自磁通技术生长的单个准晶体在10〜（-5）和10〜（-6）s〜（-1）的应变速率下单轴变形。使用透射电子显微镜分析不同处理样品中的样品。面心二十面体结构的反相边界（APB）已显示是由于移动部分位错而发生塑性变形而产生的。确定APB平面，即位错运动平面，以及对Burgers矢量和附着于APBs的位错的线方向进行分析，可以对塑性变形模式进行详细的微观结构表征。最常发现60度混合型位错。滑动优先发生在相对于压缩方向倾斜几乎45度角的平面上，即具有最高解析剪切应力的平面上。结果表明，位错运动的方式主要是纯滑行，尽管在某些情况下也观察到了爬升运动。

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