발간논문

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Vol.19, No.7, 552 ~ 558, 1981
Title
Size Distribution of Grains during Coarsening in Liquid Matrix
강찬형 Chan Hyoung Kang
Abstract
The theoretical basis of Ostwald ripening has been reviewed with particular reference to the effect of medium grain fraction on the size distribution. And the procedure to obtain a reliable size distribution by linear intercept method has been specified in detail for cobalt grains in 50% Co-50% Cu alloy at 1,200℃. Systematic tests are performed to confirm the validity of the observed grain intercept distributions. The shortcomings of chi-square test are discussed. The grain intercept distribution approaches to a stabilized form when the number of intercepts reaches about 1,000 and that of photo-micrographs 5 to 6. This result does not vary with the grouping method of intercept size classes. During coarsening, the size distribution maintains a stationary form, which is consistent with the theoretical predictions for diffusion controlled growth when the grain volume fraction exceeds about 0.5.
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