Characterization of high temperature mechanical properties using laser ultrasound

Abstract

Abstract. Laser ultrasound is employed to assess high temperature mechanical properties. A pulsed laser is used for broadband ultrasound generation, and a laser interferometer is used to detect ultrasonic vibrations. For this investigation both time and frequency domain studies are conducted. For the time domain study we measure the modulus of elasticity and the shear modulus of a nickel alloy up to 1000°C. For the frequency domain study we measure ultrasonic attenuation of a rolled copper sample during high temperature annealing. It is shown that attenuation is associated with grain alignment during the recrystallization transformation.