811 Mg 合金の結晶粒形状および微視組織変化に関するフラクタル解析の適用

概要

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In order to evaluate the geometrical irregularity and nano-structure of grain shapes for AZ31 magnesium alloy, an analytical procedure was developed by applying a concept of fractal and the Richardson effect. To examine the relation between the geometrical irregularity of grain shape and the mechanism of plastic deformation in ultra-micro scale, nano indentation tests were carried out to measure the several mechanical properties such as reduced modulus and hardness. Furthermore, some characteristics, such as crystalline structure, depth profiles, surface roughness and so on, were observed by means of atomic force microscope (AFM). Main conclusions obtained in this study are summarized as follows; (1) Grain shapes of the present metallic material have the fractal nature and represent the Richardson effect. (2) Reduced modulus on grain boundary shows the low value compared with the inner grain. (3) Several mechanical properties obtained by nano indentation tests are significantly related to the grain shape irregularity and the fractal dimension D.
社団法人日本機械学会の論文
2002-03-14