Abstract
The ultrasonic properties like elastic constant, ultrasonic velocity in the hexagonal structured nanocrystalline RuCo alloys have been studied along unique axis at room temperature. The second and third order elastic constants (SOEC & TOEC) have been calculated for these alloys using Lennard-Jones potential. The orientation dependent ultrasonic velocity has been also evaluated to study the anisotropic behaviour of these alloys. The velocities VL and VS1 have minima and maxima, respectively at 45° with unique axis of the crystal, while VS2 increases with the angle from unique axis. The inconsistent behaviour of angle-dependent velocities is associated to the action of second order elastic constants. Debye average ultrasonic velocities of these alloys are increasing with the angle and has maximum at 55° with unique axis at room temperature. Hence, when a ultrasonic wave travels at 55° with unique axis of these alloys, then the average ultrasonic velocity is found to be maximum. Elastic constants and density are mainly the affecting factor for anomalous behaviour of ultrasonic velocity in these alloys. The mechanical and ultrasonic properties of Co0.75Ru0.25 alloy will be better than the other compounds due to their high SOEC, ultrasonic velocity and low ultrasonic attenuation. Co0.75Ru0.25 alloy is more suitable for industrial and other uses, as it has the highest elastic constants and lowest ultrasonic attenuation in comparison to other of these alloys. The results of this investigation are discussed in correlation with other known thermophysical properties.
Highlights
The structure of ruthenium (Ru) is hexagonal close packed whereas cobalt (Co) has three phases those are ferromagnetic; body centered cubic, face centered cubic and hcp
The ultrasonic properties like elastic constant, ultrasonic velocity in the hexagonal structured nanocrystalline RuCo alloys have been studied along unique axis at room temperature
Debye average ultrasonic velocities of these alloys are increasing with the angle and has maximum at 55° with unique axis at room temperature
Summary
The structure of ruthenium (Ru) is hexagonal close packed (hcp) whereas cobalt (Co) has three phases those are ferromagnetic; body centered cubic (bcc), face centered cubic (fcc) and hcp. Qadri et al reported the structural and magnetic properties of PdFe and RuFe alloys synthesized through organometallic route [10]. There are three types of ultrasonic wave velocities for each direction of propagation of wave, which are well related to second order elastic constants. All the three types of ultrasonic velocities and elastic constants of these alloys are not reported in the literature. In this paper, we have calculated the three types of ultrasonic sound velocities for the alloys Co0.00Ru1.00: alloy-1; Co0.25Ru0.75: alloy-2; Co0.40Ru0.60: alloy-3; Co0.50Ru0.50: alloy-4; Co0.60Ru0.40: alloy-5; Co0.75Ru0.25: alloy-6; for each direction of propagation of wave using second order elastic constants that are important for surface and structural study of these alloys. The results obtained are interesting for the characterization of these alloys
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
