ELASTIC PROPERTIES OF FeGa AND FeGaAl ALLOYS WITH RESONANCE ULTRASOUND SPECTROSCOPY

摘要

Resonance ultrasound spectroscopy is a measurement technique that uses the absorption of sound waves at the natural resonance frequencies of a material to determine its elastic properties. In this work, the elastic properties of Fe-x at.- percent Ga and Fe-(20-y) at.- percent Ga-y at.- percent Al polycrystalline alloys were evaluated. The samples used had parallelepiped shape. The absorption spectra of FeGa and FeGaAl alloys obtained using a Dynamic Resonance Modulus system over a specific frequency range were analyzed assuming the material to be isotropic. The elastic constant values, c11 and c44, were obtained from which Young's modulus and shear modulus values were determined. The Young's modulus obtained from FeGa and FeGaAl alloys were in the range of 110 to 170 GPa and are much greater than those obtained from Terfenol-D alloys. The paper examines the trend in elastic property variation with changes in Ga and Al content.