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Interdiffusion between the L12 trialuminides Al66Ti25Mn9 and Al67Ti25Cr8

Published online by Cambridge University Press:  31 January 2011

K.S. Kumar  and
J.D. Whittenberger
K.S. Kumar
Affiliation:
Martin Marietta Laboratories, Baltimore, Maryland 21227-3898
J.D. Whittenberger
Affiliation:
NASA Lewis Research Center, Cleveland, Ohio 44135
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Abstract

Interdiffusion coefficients (D) were determined in the temperature range 1373 K–1073 K (0.85 Tm−0.65 Tm) from concentration-distance profiles that were generated from Al66Ti25Mn9/Al67Ti25Cr8 diffusion couples. As both of these materials are completely soluble in one another, the couples were treated as pseudobinaries (particularly because the Ti and Al levels were similar), and the Matano approach was used to calculate diffusion coefficients. The variation in D with composition was determined and a minimum was noted at intermediate temperatures and a relative Mn concentration of 0.5. A maximum in activation energy for interdiffusion was also noted at this concentration where Q ≍ 350 kJ/mol.

Type
Communications
Information
Journal of Materials Research , Volume 7 , Issue 5 , May 1992 , pp. 1043 - 1045
Copyright
Copyright © Materials Research Society 1992

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