Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 470, Issue 1-2, Pages L13-L16Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2008.02.074
Keywords
Metals and alloys; Rapid solidification; Thermal analysis; Thermodynamics
Categories
Funding
- New Century Excellent Person Supporting Project [NCET-05-870]
- Fundamental Research Project of National Defense of China
- Scientific Research Foundation [N6CJ0002]
- Scientific and Technological Creative Foundation of Youth in Northwestern Polytechnical University
- Natural Science Foundation of China [50501020, 50771084, 50395103]
- Northwestern Polytechnical University
- [A2720060295]
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Applying melt-fluxing, how to predict the maximal recalescence temperature T-R upon rapid solidification of bulk undercooled CU70Ni30 alloy has been investigated. Reproducible experimental results show that T-R decreases with the increase of the initial melting undercooling Delta T, and moreover its value is much lower, than that predicted by Level rule and Scheil equation, let alone the equilibrium liquidus temperature. Quantitative thermodynamic calculation, in combination with an analysis of solute distribution, demonstrates that, T-R is affected by the difference of Gibbs free energy between the residual liquid and solid after recalescence. Subjected to sufficiently high Delta T, T-R should be nearly equal to the thermodynamic T-o point corresponding to the concentration of the residual melt after recalescence. (C) 2008 Elsevier B.V. All rights reserved.
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