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首页> 外文期刊>Applied Surface Science >Surface Phase Transformation Induced By The Dezincification Of A Beta Cu-zn Alloy On Highly Deformed Systems
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Surface Phase Transformation Induced By The Dezincification Of A Beta Cu-zn Alloy On Highly Deformed Systems

机译：β-Cu-zn合金在高度变形系统中脱锌引起的表面相变

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When Cu-Zn alloys are annealed under dynamical vacuum the Zn component evaporates. The process is called dezincification. This paper presents the results of the dezincification of highly mechanically deformed surfaces of samples initially in the beta (bcc) phase by a combination of in situ optical microscopy observations together with TEM measurements. It is shown that grinding lines remaining from the sample preparation process act as nucleation centers for the alpha (fcc) phase. Under this surface preparation conditions the new fcc phase nucleates with a different geometry than the one reported in previous papers in which surfaces were finished by electropolishing. In the present case, we observe individual fcc precipitates with a well defined geometry. The typical size of precipitates is in the micron range, and depends on the dezincification parameters: final temperature, dezincification time and prior surface preparation. TEM observations show that the fcc precipitates contain a large density of defects, mainly dislocations and twin boundaries.
机译：当Cu-Zn合金在动态真空下退火时，Zn成分蒸发。该过程称为脱锌。本文结合现场光学显微镜观察和TEM测量结果，介绍了最初处于beta（bcc）相的高度机械变形的样品表面脱锌的结果。结果表明，样品制备过程中剩余的研磨线充当α（fcc）相的形核中心。在这种表面处理条件下，新的fcc相成核的几何形状与以前论文中报道的那种不同，其中通过电抛光对表面进行抛光。在目前的情况下，我们观察到具有明确定义的几何形状的单个fcc沉淀。沉淀物的典型尺寸在微米范围内，并且取决于脱锌参数：最终温度，脱锌时间和先前的表面准备。 TEM观察表明，fcc沉淀物含有大量缺陷，主要是位错和孪晶边界。

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