In this paper, the use of chromium (Cr) as a grain refiner for a CuAlBe shape memory alloy is discussed. Alloys with 0.1, 0.2, 0.3 and 0.5 wt.% Cr were characterized by optical microscopy, scanning electron microscope and X-ray diffraction. Also, the influence of the different percentages of Cr on the grain size and on the mechanical properties was analyzed through macro and microscopic evaluations and by tensi...
This work carried out a nondestructive evaluation of grain size influence on the mechanical properties of a CuAlBe shape memory alloy with and without grain refiners. Ultrasonic signal processing, considering only the longitudinal velocity, was used for the nondestructive evaluation. Therefore, the average modulus of elasticity values found for the CuAlBe shape memory alloy was 45.7 GPa and 57.3 GPa with and wi...
O objectivo deste trabalho foi determinar a constante elástica de uma liga com memória de forma CuAlBe através de ensaio por ultra-som. Foi utilizado um transdutor longitudinal com frequência central de 54kHz, e um osciloscópio para medir o intervalo de tempo envolvido. Como a espessura do material ensaiado era conhecida, foi possível determinar a velocidade sónica. A partir dos dados desta velocidade e da dens...
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