E. S. Gorkunov Institute of Mechanical Engineering, Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia¹ ; Institute of New Materials and Technologies, Ural Federal University named after B. N. Yeltsin, the first president of Russia, Yekaterinburg, Russia²

D. R. Salikhianov, Researcher^1,2, Associate Professor, Candidate of Technical Sciences, e-mail: salenhall@gmail.com

JSC Yekaterinburg Non-Ferrous Metals Processing Plant, Yekaterinburg, Russia

А. Е. Pervukhin, Chief Specialist in Drawing and Heat Treatment, Candidate of Technical Sciences, e-mail: a.pervuhin@ezocm.ru

Products made of platinum and its alloys are manufactured by rolling, drawing and pressing processes. For the development of new technological processes, their finite element modeling and tool design, the most important technological characteristic is the deformation resistance, which is determined experimentally. In this work, the deformation hardening curves of the platinum-rhodium PlRd80-20 alloy are experimentally obtained and studied in the form of dependence of deformation resistance on the thermomechanical parameters of hot deformation using the compression test method. The experimental part of the work was performed on the plastometric testing system of Mechanical Engineering Research Institute of the Ural Branch of the Russian Academy of Sciences, which ensures the constancy of the deformation rate and temperature. The strain rates were set in the range from 0.1 to 10 s^–1, the temperature range of the tests was in the range from 700 to 1200 ^oC. When analyzing the hardening curves, it has been noted that despite the high deformation temperatures (700, 1200 ^oC), the PlRd80-20 alloy has high deformation resistance values (from 250 to 450 MPa under conditions of developed plastic deformation), which makes it possible to characterize the alloy as difficult to process. Thermomechanical parameters have a typical effect for hot deformation of metallic materials: the higher the deformation rate and the lower the temperature, the higher the deformation resistance. The analytical part of the work includes the development of a formula describing the deformation resistance of the PlRd80-20 alloy as a function of the thermomechanical parameters of hot deformation, suitable for integration into finite element modeling packages. The results of comparing the calculated and experimental curves in the test range have shown that the average relative error was 0.73%.

1. Sidelnikov S. B., Lopatina E. S., Lopatin V. A. et al. Improvement of technology for the production of jewelry wire from platinum alloys. Metallurgist. 2024. Vol. 68. pp. 828–836. DOI: 10.1007/s11015-024-01790-7
2. Trumic B., Gomidzelovic L., Marjanovic S. et al. Pt-Rh alloys: investigation of tensile strength and elongation at high temperatures. Archives of Metallurgy and Materials. 2015. Vol. 60, Iss. 2. pp. 643–647.
3. Zarinejad M., Rimaz S., Tong Y. et al. Dependence of mechanical properties of platinum-rhodium binary alloys on valence electron parameters. Johnson Matthey Technology Review. 2023. Vol. 67, Iss. 3. pp. 290–299.
4. Hughes A. E., Haque N., Northey S. A., Giddey S. Platinum group metals: a review of resources, production and usage with a focus on catalysts. Resources. 2021. Vol. 10. 93. DOI: 10.3390/resources10090093
5. Egoshina A. V., Slepchenko G. B. Intensification of opening a thrust alloy based on platinum and rhodium. Inorganic Materials. 2024. Vol. 60. pp. 78–83.
6. Donati L., Reggiani B., Pelaccia R. et al. Advancements in extrusion and drawing: a review of the contributes by the ESAFORM community. International Journal of Material Forming. 2022. Vol. 15. 41. DOI: 10.1007/s12289-022-01664-w
7. Loginov Yu. N., Fomin A. A. Deformation resistance of platinum alloy Pt81Pd15Rh3.5Ru0.5. Tsvetnye Metally. 2015. No. 12. pp. 80–83.
8. Loginov Yu. N., Gladkovsky S. V., Potapov A. I. et al. Studying the deformation resistance of polycrystalline iridium. Izvestiya vuzov. Tsvetnaya metallurgiya. 2015. No. 1. pp. 48–54.
9. Potapov A. I., Gladkovsky S. V., Kokovikhin E. A. et al. Determination of plastic deformation resistance of metallic materials on an automated plastometric complex. Diagnostics, Resource and Mechanics of Materials and Structures. 2015. No. 2. pp. 24–43.
10. Hu F., Yu T., Liu W. et al. Pt-20Rh dispersion strengthened by ZrO2 - Microstructure and strength. Materials Science and Engineering: A. 2019. Vol. 765. 138305. DOI: 10.1016/j.msea.2019.138305
11. Wenderoth M., Völkl R., Yokokawa T. High temperature strength of Pt-base superalloys with different γ′ volume fractions. Scripta Materialia. 2006. Vol. 54, Iss. 2. pp. 275–279. DOI: 10.1016/j.scriptamat.2005.09.017
12. Hu F., Wang Z., Yu T. et al. Microstructure and strength of weldment in Pt20Rh alloys dispersion-strengthened by ZrO2 particles. IOP Confe rence Series: Materials Science and Engineering. 2019. Vol. 580. 012035. DOI: 10.1088/1757-899X/580/1/012035
13. Hu X., Ning Y., Chen L. et al. Physical properties and application performance of platinum-palladium-rhodium alloys modified with cerium. Platinum Metals Review. 2012. Vol. 56, Iss. 1. P. 40–46. DOI: 10.1595/147106711X615749