Structure-Property Correlation in Intermetallic Compounds of Aluminium with Ruthenium, Iridium and Nickel

The intermetallic compounds X-aluminium (X = ruthenium, iridium, nickel) show unique combinations of mechanical strength, thermal stability and oxidation resistance, making them attractive for advanced structural and functional applications. The present work explores the ultrasonic properties of selected materials for understanding their thermophysical temperature-dependent behaviour. The thermophysical properties for selected intermetallic compounds X-aluminium such as specific heat, energy density, thermal conductivity, Debye temperature and thermal relaxation time have been enumerated using second and third order elastic constants (SOECs and TOECs) via the Born potential model in the temperature range 0–500 K. The ELATE visualisation tool has been used to envision mechanical parameters such as Young’s modulus, shear modulus, Poisson’s ratio and compressibility (linear) at zero pressure for ruthenium-aluminium, iridium-aluminium and nickel-aluminium in three dimensions (3D). The mechanical and ultrasonic properties of X-aluminium such as shear modulus, Young’s modulus, Zener anisotropic factor, Poisson’s ration, Pugh’s ratio and ultrasonic wave velocities for longitudinal and shear modes along <100>, <110> and <111> directions have been enumerated using the established mathematical model. Finally, all computed parameters have been utilised to evaluate the ultrasonic attenuation for the selected intermetallics. The obtained results are discussed and cumulated with available results on the materials for further analysis of intermetallic bonding, phase stability and high-temperature behaviour.