Abstract
The superplastic behavior and deforming mechanism for polycrystalline NiAl–9Mo alloy with a two-phase microstructure consisting of a dispersion of α-Mo phase in a β-NiAl matrix are investigated in this paper. The alloy exhibits superplastic elongations as high as up to 180% under an initial strain rate of 1.11×10 −4 s −1 at 1373 K with strain rate sensitive index of 0.56. Grain boundary sliding and rotation of β-NiAl matrix is responsible for superplastic deformation in this alloy. The premature fracture stems from serious cavitation occurring during the deformation process. The superplastic deformation behavior is similar to that of single-phase intermetallics, such as Ni 3Al, Ni 3Si and Co 3Ti.
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