EFFECT OF SINTERING TEMPERATURE ON THE MICROSTRUCTURE AND PROPERTIES OF POWDER METALLURGY HF0.5NB0.5TA0.5TI1.5ZR REFRACTORY HIGH-ENTROPY ALLOY

1 GOUVEA Larissa A.
Co-authors:
2 KOVACOVA Zuzana 1 JAN Vit 1 SPOTZ Zdenek 2 KITZMANTEL Michael 2 NEUBAUER Erich 1 DLOUHY Ivo
Institutions:
1 Brno University of Technology, Faculty of Mechanical Engineering, Institute of Materials Science and Engineering, NETME centre, Brno, Czech Republic, EU, gouvea@fme.vutbr.cz
2 RHP-Technology GmbH, Forschungs- und Technologiezentrum, 2444 Seibersdorf, Austria
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
1486-1491
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
28 views / 16 downloads
Abstract

The present work is focused on the synthesis and mechanical properties evaluation of non-equiatomic Hf0.5Nb0.5Ta0.5Ti1.5Zr Refractory High-Entropy Alloy (RHEA). For the alloy production, a combination of mechanical alloying (MA) process in a planetary ball mill and hot pressing (HP) for powder densification was utilized. The effect of different sintering temperatures was explored in a temperature range of 1200 °C up to 1600 °C. The bulk material was then subject to investigation in terms of its microstructural features, elemental and phase composition and basic mechanical properties by scanning electron microscopy (SEM), X-ray diffraction (XRD), as well as hardness testing, density determination by Archimedes’ principle. The results show that very hard fine grained bulk materials were achieved in all microstructures, with an average hardness of (784 ± 5) HV0.2, (793 ± 3) HV0.2 and (814 ± 5) HV0.2 for the sintering temperatures of 1200 °C, 1300 °C and 1600 °C respectively. The slightly minimum increase in hardness might be attributed to the partial dissolution of a second-phase triggered by the increase in temperature.

Keywords: Compositionally complex alloys, refractory alloy, hot pressing, mechanical alloying
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