Diffusion Bonding of Dissimilar Intermetallic Alloys Based on Ti2AlNb and TiAl

Abstract

Abstract:

Direct diffusion bonding of an orthorhombic Ti₂AlNb base alloy to a TiAl base alloy, Ti-22Al-23Nb-2Ta and Ti-46.2Al-2Cr-2Nb-0.15B (at. pct), was carried out and the interface microstructure, formation of new phase at the interface and joint strength were characterized. At low temperature, a new phase with AlNb₂-structure, Al(Nb, Ti)₂, was formed in the interface region adjacent to the O base alloy. The α₂ was found to be the major reaction product and developed in the interface region adjacent to the TiAl alloy as well as in the region adjacent to the O base alloy accompanying the formation of Al(Nb, Ti)₂. The occurrence of Al(Nb, Ti)₂ has been attributed to the different diffusivity of Nb and Al, leading to a eutectoid-like reaction. At relatively high temperature, Al(Nb, Ti)₂ did not form due to enhanced diffusion of Nb but a B2-enriched zone formed on the O alloy side instead after long holding time. Only when an appropriate interface microstructure was achieved by optimizing the bonding parameters, could the shear strength of the joint reach 80% of that of the TiAl base alloy.

Key words: Diffusion bonding, Interface, Shear strength, TiAl, Orthorhombic alloy

Jianying Zou,Yuyou Cui,Rui Yang. Diffusion Bonding of Dissimilar Intermetallic Alloys Based on Ti₂AlNb and TiAl[J]. J Mater Sci Technol, 2009, 25(06): 819-824.

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Diffusion Bonding of Dissimilar Intermetallic Alloys Based on Ti₂AlNb and TiAl

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