Abstract
The three elastic stiffness constants of various Ni-based intermetallic Ni 3X (X = Mn, Fe, Al, Ga, Ge and Si) with L1 2 structure have been determined at room temperature by the rectangular parallelepiped resonance method. The elastic anisotrophy factor, A, of the compounds is generally large, ranging from 2.5 to 3.3 except for Ni 3Ge ( A = 1.71). The large anisotropy is believed to be responsible at least partly for the positive temperature dependence of the flow stress observed for these compounds. The elastic constants exhibit some correlation with the lattice constants. The minor element, X, can be regarded as exerting “chemical pressure” which causes the expansion of the Ni lattice, thus resulting in the decrease of the elastic constant.
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