薄膜形磁気ディスク用アルマイト基板における亀裂の発生
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概要
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The crack nucleation mechanism in an alumite substrate for thin film magnetic film disks is investigated by using the scratch technique. The alumite substrate consists of a hard-brittle anodized alumite layer of μm-order thickness and a soft-ductile Al-Mg alloy base. In the scratching of the alumite substrate even with a relatively blunt indenter, the so-called median crack is observed at a low load prior to the tensile bow crack. This crack is a typica nucleation process when bulk hard-brittle materials are scratched by very a sharp indenter such as a Vickers indenter. It is also observed that two types of median cracks exist. One is nucleated at the elastic/plastic boundary just below the indenter and is propagated downward. Another is nucleated at the alumite/Al-Mg alloy boundary and is propagated upward. These crack nucleation mechanisms are investigated by stress analysis using FEM as well.
- 一般社団法人日本機械学会の論文
- 1991-04-25