To improve the understanding of the diffusion bonding process of gamma-titanium aluminides, mechanical properties at the bonding conditions of typical alloys were evaluated using creep tests and compression tests combined with strain rate cycling, temperature cycling and stress relaxation. The results were used to pre-select bonding parameters and to determine the diffusion mechanism that occurred during subsequent bonding experiments. Scanning electron microscopy, OIM (orientation imaging microscopy) and EDX (energy dispersive x-ray analysis) were used to characterize the constitution and microstructure that are developed in the bonding zone of the diffusion couples. Room temperature tensile tests of bonded specimen were conducted to evaluate the bond strength.
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