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Supercooling effects in Cu-10 wt pct Co alloys solidified at different cooling rates
- Source :
- Metallurgical Transactions A - Physical Metallurgy and Materials Science. 23A(6, Ju)
- Publication Year :
- 1992
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 1992.
-
Abstract
- Electromagnetic levitation and electron beam surface melting were employed to study the effects of supercooling and cooling rate on the solidification of Cu-10 wt pct Co alloys. Two major effects were observed in the supercooled alloys: the nucleation of a metastable copper-rich phase which contains 13 wt pct to 20 wt pct Co in samples supercooled between 105 and 150 K and liquid phase separation which occurs in samples supercooled 150 K or more. The microstructure of the electron beam melted surfaces consisted of very fine spheres which were similar to those of the sample supercooled more than 150 K but with a refined microstructure. The results indicate that a dynamic bulk supercooling of 150 K may exist in the molten pool during the solidification of electron beam melted surfaces.
- Subjects :
- Metallic Materials
Subjects
Details
- Language :
- English
- ISSN :
- 03602133
- Volume :
- 23A
- Issue :
- 6, Ju
- Database :
- NASA Technical Reports
- Journal :
- Metallurgical Transactions A - Physical Metallurgy and Materials Science
- Publication Type :
- Report
- Accession number :
- edsnas.19920059050
- Document Type :
- Report