Atomic Diffusion and Phase Equilibria at the Interfaces of the CoAl/Ir Multilayer on Nb^sub 5^Si^sub 3^-Base Alloys

From: Metallurgical and Materials Transactions | Date: March 1, 2005| Author: | Copyright information

Atomic diffusion and phase equilibria have been investigated at the interfaces of Ir/CoAl and Ir/Nb^sub 5^Si^sub 3^ to evaluate the suitability of a diffusion-barrier layer of Ir between an oxidation-resistant layer of B2-CoAl and a base material Nb^sub 5^Si^sub 3^. Diffusion couples were prepared by hot pressing and annealed at 1573 K for up to 178 hours. Diffusion layers of (Ir, Co) solid solution and B2-(Ir, Co)Al were formed at the Ir/CoAl interface. The concentration of Al dramatically dropped at the interface, which indicates that the Ir layer effectively works as the diffusion barrier ...

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