Abstract
Al-Si alloy has been widely used for engine pistons and cylinders because of its light weight and high wear resistance. It was clarified that the wear resistance could be increased by large-area EB irradiation. However, many craters were generated on the EB irradiated surface. If the crater generation could be reduced, further improvement in wear resistance might be possible. In this study, heat conduction analysis of the Al-Si alloy surface was carried out in order to discuss the temperature distribution and the crater generation mechanism. Then a two-staged large-area EB irradiation method, in which the craters generated by first high energy condition were smoothed by second low energy condition was tried on the basis of the analysis results.
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