Effect of growth rate dependent partition coefficient on the dendritic growth in undercooled melts
Journal Article
·
· Acta Metall.; (United States)
The theory of alloy dendritic growth at large undercoolings is extended to include the effect of growth rate dependent partition coefficient on the growth rate, tip radius and composition of dendrites. Three distinct behaviors are observed depending on the value of the dimensionless rate upsilon. For small values of upsilon,k approx. = k/sub 0/. For the intermediate range, when upsilon is between 0.01 and 100, a significant effect of the velocity dependent partition coefficient is found. When upsilon > 100, k ..-->.. 1 and the dendrite behavior in an alloy is found to approach that for the pure material. In undercooled alloy melts segregation free zones could then be obtained by dendrite growth.
- Research Organization:
- Ames Lab.-USDOE and Dept. of Materials Science and Engineering, Iowa State Univ., Ames, IA 50011
- OSTI ID:
- 5621251
- Journal Information:
- Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 35:4; ISSN AMETA
- Country of Publication:
- United States
- Language:
- English
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