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在检查不可热处理强化的变形铝合金(如LF21和LF2等)的金相组织时,用通常的混合酸(即Keller’s试剂)很难显露晶粒边界,因而无法了解晶粒的大小和形状。除变形铝合金之外,铸造铝合金(如Al-Si-Mg系的ZL101)也存在类似问题,即只能观察到树枝状结晶的分布,不能辨别出不同位向的结晶。为了解决这个问题,一般常用的方法是将试样电解抛光,再阳极复膜,然后在显微镜上用偏振光照明观察组织。这种方法的原理是,因取向不同的晶粒磨面电解侵蚀、复膜形成的氧化膜结构不同,因而在偏
When examining the microstructure of non-heat-treatable strengthened aluminum alloys (such as LF21 and LF2), it is difficult to reveal the grain boundaries with the usual mixed acid (ie, Keller’s reagent) and hence the size and shape of the grains can not be known. In addition to the deformed aluminum alloy, similar problems exist in the cast aluminum alloy (such as Al-Si-Mg-based ZL101), in which only the distribution of dendrites can be observed and the crystals in different orientations can not be distinguished. In order to solve this problem, the commonly used method is to electropolish the sample, and then the anode film, and then observe the tissue with polarized light on the microscope. The principle of this method is that, due to the different orientation of the grain grinding electrolytic erosion, the film formed by the complex structure of the oxide film, so in the partial