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...
Cu-Al-Ni and Cu-Al-Be shape memory alloys were cast under ambient atmosphere, and characterized thought optical microscopy, X-ray diffraction, and differential scanning calorimetry. Superelasticity, and shape recovery were evaluated using mechanical tensile test. Thermomechanical properties of shape memory alloys used were obtained under different temperature range, in which was possible to conclude that Cu-Al-...
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