TY - JOUR

T1 - Experimental Study of the Subsolidus Region of the Ir-Ni Phase Diagram

AU - Shubin, Yu V.

AU - Popov, A. A.

AU - Plyusnin, P. E.

AU - Sharafutdinov, M. R.

AU - Korenev, S. V.

N1 - Funding Information: The synthesis of the Ir-Ni alloys was performed within project # 21-13-00414, supported by the Russian Science Foundation. Phase equilibria were studied within project # 20-33-90211, supported by the Russian Foundation for Basic Research. The work was performed using the facilities of the Siberian Center for Synchrotron and Terahertz Radiation. The authors are grateful to Evgeny Gerasimov for his assistance in the TEM studies. Publisher Copyright: © 2022, ASM International.

PY - 2022/8

Y1 - 2022/8

N2 - The phase diagram of the refractory Ir-Ni system was reinvestigated in the temperature range of 500-900 °C using a special approach designed to reduce kinetic difficulties in reaching the equilibrium state. Ir-Ni porous nanoalloys obtained by reductive thermolysis at 600 °C of specially prepared multicomponent precursors were used as initial samples in the study of phase equilibria. The thermolysis conditions of the precursors were selected based on thermal analysis data. The formation of Ir-Ni nanoalloys was studied in situ by high-temperature x-ray diffraction on a synchrotron radiation source. The study of samples subjected to long-term annealing at temperatures of 500, 700 and 900 °C confirmed that Ir-Ni alloys formed a continuous series of disordered substitution solid solutions. The existence of Ir3Ni, IrNi, IrNi3 intermetallic phases mentioned earlier by other authors was not confirmed. It was experimentally shown that Ir-Ni alloys formed only a continuous series of disordered substitutional solid solutions over the entire composition range in the subsolidus region.

AB - The phase diagram of the refractory Ir-Ni system was reinvestigated in the temperature range of 500-900 °C using a special approach designed to reduce kinetic difficulties in reaching the equilibrium state. Ir-Ni porous nanoalloys obtained by reductive thermolysis at 600 °C of specially prepared multicomponent precursors were used as initial samples in the study of phase equilibria. The thermolysis conditions of the precursors were selected based on thermal analysis data. The formation of Ir-Ni nanoalloys was studied in situ by high-temperature x-ray diffraction on a synchrotron radiation source. The study of samples subjected to long-term annealing at temperatures of 500, 700 and 900 °C confirmed that Ir-Ni alloys formed a continuous series of disordered substitution solid solutions. The existence of Ir3Ni, IrNi, IrNi3 intermetallic phases mentioned earlier by other authors was not confirmed. It was experimentally shown that Ir-Ni alloys formed only a continuous series of disordered substitutional solid solutions over the entire composition range in the subsolidus region.

KW - alloys

KW - iridium

KW - nickel

KW - phase diagram

UR - http://www.scopus.com/inward/record.url?scp=85135849202&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/bc1a450c-f39d-3dbc-a06d-37eeb80795ad/

U2 - 10.1007/s11669-022-00982-5

DO - 10.1007/s11669-022-00982-5

M3 - Article

AN - SCOPUS:85135849202

VL - 43

SP - 419

EP - 426

JO - Journal of Phase Equilibria and Diffusion

JF - Journal of Phase Equilibria and Diffusion

SN - 1547-7037

IS - 4

ER -