The elastic stiffness coefficients of nickel‐iron single‐crystal alloys at room temperature

The adiabatic elastic stiffness coefficients of four Ni‐Fe single‐crystal alloys in the composition range from 90 to 50 wt. % of Ni have been determined by the ultrasonic coherent pulse/ continuous wave (cw) technique at room temperature at a frequency of 8 MHZ. The alloying composition influences the three independent elastic constants C11, C12, and C44 of the Cubic crystal. The striking feature is the highly linear dependence of the shear constants C′[ = (C11−C12)] and C44 on the relative concentration of the constituents.