The six independent third‐order elastic constants of aluminium single‐crystal were determined at 298°K by measuring the uniaxial stress derivatives of the effective second‐order elastic constants of the crystal in 〈110〉 direction. A pulse interference technique at 10 MHz was used, capable of measuring natural velocities to a few parts in 106. The specimen was irradiated with a neutron beam to pin down dislocation network under uniaxial stresses.
The six third‐order elastic constants of single crystal ferromagnetic nickel at 80°K were determined by measurement of ultrasonic wave velocities as a function of an applied uniaxial stress. The effect of magnetic domains on the ultrasonic propagation were eliminated by keeping the specimen in a transverse saturation magnetic field. Theoretically predicted constants based on central force model are discussed with experimentally measured constants.
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