Journal of Pure and Applied Ultrasonics

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Ultrasonic Properties of β-Phase Nickel Aluminide


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1 Physics Department, Allahabad University, Allahabad-211002, India
 

The ultrasonic attenuation due to phonon-phonon interaction has been evaluated in β-phase NiAl in high temperature interval 300-1400K along the crystallographic directions <100>, <110> and <111> for longitudinal and shear waves. For this evaluation we have calculated second and third order elastic constants (SOEC and TOEC) at the different temperatures using only two basic parameters. Ultrasonic velocities and Non-linearity parameters are calculated using the elastic constants. Structural stability, abrupt change in ductility, disordering at TC may be predicted on the basis of temperature variation of the elastic constants and the ultrasonic attenuation.
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  • Ultrasonic Properties of β-Phase Nickel Aluminide

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Authors

R. R. Yadav
Physics Department, Allahabad University, Allahabad-211002, India
D. K. Pandey
Physics Department, Allahabad University, Allahabad-211002, India

Abstract


The ultrasonic attenuation due to phonon-phonon interaction has been evaluated in β-phase NiAl in high temperature interval 300-1400K along the crystallographic directions <100>, <110> and <111> for longitudinal and shear waves. For this evaluation we have calculated second and third order elastic constants (SOEC and TOEC) at the different temperatures using only two basic parameters. Ultrasonic velocities and Non-linearity parameters are calculated using the elastic constants. Structural stability, abrupt change in ductility, disordering at TC may be predicted on the basis of temperature variation of the elastic constants and the ultrasonic attenuation.