대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)
- 제20권10호
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- Pages.3361-3370
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- 1996
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
DOI QR Code
역확산을 고려한 이원합금의 비평형 수지상응고 해석
Analysis on the non-equilibrium dendritic solidification of a binary alloy with back diffusion
- Jeong, Jae-Dong (Dept.of Mechanical Engineering, Graduate School of Seoul National University) ;
- Yu, Ho-Seon ;
- Lee, Jun-Sik (Dept.of Mechanical Engineering, Graduate School of Seoul National University)
- 발행 : 1996.10.01
초록
Micro-Macro approach is conducted for the mixture solidification to handle the closely linked phenomena of microscopic solute redistribution and macroscopic solidification behavior. For this purpose, present work combines the efficiency of mixture theory for macro part and the capability of microscopic analysis of two-phase model for micro part. The micro part of present study is verified by comparison with experiment of Al-4.9 mass% Cu alloy. The effect of back diffusion on the macroscopic variables such as temperature and liquid concentration, is appreciable. The effect, however, is considerable on the mixture concentration and eutectic fraction which are indices of macro and micro segregation, respectively. According to the diffusion time, the behavior near the cooling wall where relatively rapid solidification permits short solutal diffusion time, approaches Scheil equation limit and inner part approaches lever rule limit.
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