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Isothermal sections in the Cr–Ga–N system in the 650–1000 °C temperature range

Published online by Cambridge University Press:  31 January 2011

L. Farber  and
M. W. Barsoum
L. Farber
Affiliation:
Department of Materials Engineering, Drexel University, Philadelphia, Pennsylvania 19104
M. W. Barsoum*
Affiliation:
Department of Materials Engineering, Drexel University, Philadelphia, Pennsylvania 19104
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Isothermal sections at 670, 740, and 800 °C in the Cr–Ga–N ternary system were investigated. Details of the Cr–Ga and Cr–N binary phase diagrams were confirmed, and the equilibrium diagrams were constructed. At all temperatures, Cr3GaN was in equilibrium with all the condensed phases, except GaN. In the 670–800 °C temperature range, Cr2GaN appears to be kinetically stable in contact with GaN. This led to the construction of behavior diagrams that are valid only as long as GaN is present in the initial mixture. Above ∼910 °C, Cr2GaN decomposes to form Cr3GaN, CrN, and Ga(1). At 1000 °C, Cr3GaN is in equilibrium with all the condensed phases, and CrN is in equilibrium with Ga.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 6 , June 1999 , pp. 2560 - 2566
Copyright
Copyright © Materials Research Society 1999

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