Non-destructive ultrasonic evaluation of Ir-Os alloys

Platinum-group elements are gaining popularity due to their chemical stability and distinctive features, making them intriguing for diverse applications. Ir1-xOsx (0.5 ≤ × ≤ 1.0) alloys form a hexagonal structure suitable for high-temperature stability, excellent corrosion resistance and high-performance coating. Here, novel and comprehensive elastic constants of binary IrOs alloys were examined and analysed utilising Lenard-Jones many-body interactions potential model. Second and third order elastic constants for all alloys have been estimated and used to calculate mechanical properties such as bulk modulus, Young’s modulus, shear modulus, and Poisson’s ratio. Anisotropy and the material’s resistance to deformation under different physical conditions have been computed using Vickers hardness, microhardness, Lame’s modulus, stiffness, Kleinman’s parameter, and anisotropies of compressible and shear waves. Among all alloys, Ir0.10Os0.90 shows high hardness, stiffness, and reduced anisotropy in compressional and in-plane shear waves, ensuring optimal mechanical strength and isotropy. The behaviour of ultrasonic wave propagation in the materials in the different crystallographic directions has been examined for non-destructive testing and advanced superhard material design.