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首页> 外文会议>Nanomaterials by severe plastic deformation >Processing of Ultrafine Grained Cu-30Zn alloy through Severe Plastic Deformation using Accumulative Roll Bonding
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Processing of Ultrafine Grained Cu-30Zn alloy through Severe Plastic Deformation using Accumulative Roll Bonding

机译：累积轧制法通过严重塑性变形严重加工Cu-30％Zn超细晶粒合金

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摘要

In the present research, the microstructural features of ultrafine grained Cu-30 Zn alloy via ARB at room temperature were investigated by X-ray diffraction peak profile analysis. The character of dislocations was determined by analyzing the dislocation contrast factors. The average contrast factors for the different reflections obtained by determination of the type of dislocations and Burgers vectors in crystals. Also, using the modified Williamson-Hall and Warren-Averbach procedure size parameters, the effective outer cut-off radius and density of dislocations were determined. Assuming that the grain size distribution is log-normal, the median and the variance of the size distribution of sub grains were obtained. It was found that the crystallite size is reduced substantially, while the dislocation density increases up to 2 cycles of ARB. After 2~(nd) cycle, dislocation density decreases. This is attributed to the occurrence of dynamic restoration process which takes place during next ARB cycles.
机译：在本研究中，通过X射线衍射峰轮廓分析研究了超细晶粒Cu-30 Zn合金在室温下通过ARB的显微组织特征。通过分析位错对比因子确定位错的特征。通过确定晶体中的位错类型和Burgers向量获得的不同反射的平均对比度因子。同样，使用改良的Williamson-Hall和Warren-Averbach程序尺寸参数，确定有效的外部截止半径和位错密度。假设晶粒尺寸分布为对数正态分布，则获得了亚晶粒尺寸分布的中值和方差。发现微晶尺寸显着减小，而位错密度增加到ARB的2个循环。经过2〜（nd）个循环后，位错密度降低。这归因于在下一个ARB周期中发生的动态恢复过程。

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