Deformation of Bi-PST crystals of TiAl produced by diffusion bonding[Polysynthetically Twinned]

Diffusion bonded bi-PST crystals of three different series were prepared and they were deformed in tension at room temperature. Yield stress and elongation exhibited by bi-PST crystals consisting of component crystals with the lamellar microstructure aligned along the tensile axis do not significantly differ from those of component crystals. Plastic strain incompatibility at the interface exerts a strong influence on the deformation behavior of bi-PST crystals when the incompatibility activates additional information modes which are much harder than deformation modes operative in each component crystal.