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Evaluation of Solubility Limit of Carbon in Ni3AlC1-x

Published online by Cambridge University Press:  16 March 2011

Hideki Hosoda  and
Tomonari Inamura
Hideki Hosoda
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259-R2-27, Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
Tomonari Inamura
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259-R2-27, Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
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Abstract

In order to clarify the phase stability of E21-type intermetallic carbides, the maximum solid solubility of carbon in Ni3AlC1-x was evaluated by taking into account the strain energy and the chemical energy for the formation of the Ni6C cluster (EM6C). It was found that the maximum carbon content calculated was 0 at.%C at EM6C≥0, 3.5 at.%C at EM6C = -5 kJ/mol, 6.5 at.%C at EM6C = -10 kJ/mol, 10 at.%C at EM6C = -15 kJ/mol and 13 at.%C at EM6C = -20 kJ/mol, respectively. Experimentally determined maximum carbon contents in Ni3Al in the literature can be explained when EM6C is ranged from -5 to -15 kJ/mol, and the solid solubility is found to be sensitive to EM6C. The attractive interaction between Ni and C seems to be due to covalent bonding. Similar attractive chemical interaction between transition metals and carbon must stabilize E21 phases.

Keywords

alloyCphase equilibria
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n02-09
Copyright
Copyright © Materials Research Society 2011

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