Interdiffusion in the Ir-Rich Solid Solutions of Ir-Pt, Ir-Rh, and Ir-Re Binary Alloys

Abstract

Interdiffusivity in the Ir-rich solid solutions of Ir-X (X = Pt, Rh and Re) binary alloys was investigated in the temperature range of 2073-2373 K. The interdiffusion coefficients within the solute concentration range up to 10 at.% were evaluated through conventional diffusion-couple experiments. The composition dependence of the interdiffusion coefficient was negligible in the Ir-Rh and Ir-Re solid solutions. On the other hand, some composition dependence was evident in the interdiffusion coefficient of the Ir-Pt solid solution, which increased with increasing Pt content. In comparison with the tracer self-diffusivity of pure Ir, the interdiffusivity in the Ir-Rh and Ir-Pt solid solutions was higher, but that in Ir-Re was lower within the temperature range studied.

Electronic structure, phase stability, and vibrational properties of Ir-based intermetallic compound IrX (X=Al, Sc, and Ga)

“…Iridium-based alloys have been selected as the most promising protective coating materials at ultrahigh temperatures [1][2][3][4]. The IrAl compound is proposed as a smart oxidation-resistant coating that can form an aluminum layer as a protective coating on the iridium layer by oxidation [5].…”

Mechanical, vibration, and optical properties of IrAl intermetallic compound via DFT calculations: high-pressure effect

“…Aluminum-based compounds from the intermetallic family are a promising material class with cost-effectiveness, easy preparation, low density, resistance to oxidation and corrosion, and high strength properties [4]. IrAl compound, which has a cubic structure, has become a promising material in the field of thermal barrier coating with its physical properties [5][6][7][8][9]. The symmetry of the bond structure in the IrAl compound creates high-temperature strength and improves ductility.…”