The effect of processing route on properties of HfNbTaTiZr high entropy alloy

0521401 - ÚFP 2020 RIV CH eng J - Článek v odborném periodiku
Málek, J. - Zýka, J. - Lukáč, František - Vilémová, Monika - Vlasák, T. - Čížek, J. - Melikhova, O. - Macháčková, A. - Kim, H.S.
The effect of processing route on properties of HfNbTaTiZr high entropy alloy.
Materials. Roč. 12, č. 23 (2019), č. článku 4022. E-ISSN 1996-1944
Grant CEP: GA ČR GA17-17016S
Institucionální podpora: RVO:61389021
Klíčová slova: High-entropy alloy * Microstructure * Plastic deformation * Powder metallurgy
Obor OECD: Materials engineering
Impakt faktor: 3.057, rok: 2019
Způsob publikování: Open access
https://www.mdpi.com/1996-1944/12/23/4022

High entropy alloys (HEA) have been one of the most attractive groups of materials for researchers in the last several years. Since HEAs are potential candidates for many (e.g., refractory, cryogenic, medical) applications, their properties are studied intensively. The most frequent method of HEA synthesis is arc or induction melting. Powder metallurgy is a perspective technique of alloy synthesis and therefore in this work the possibilities of synthesis of HfNbTaTiZr HEA from powders were studied. Blended elemental powders were sintered, hot isostatically pressed, and subsequently swaged using a special technique of swaging where the sample is enveloped by a titanium alloy. This method does not result in a full density alloy due to cracking during swaging. Spark plasma sintering (SPS) of mechanically alloyed powders resulted in a fully dense but brittle specimen. The most promising result was obtained by SPS treatment of gas atomized powder with low oxygen content. The microstructure of HfNbTaTiZr specimen prepared this way can be refined by high pressure torsion deformation resulting in a high hardness of 410 HV10 and very fine microstructure with grain size well below 500 nm.
Trvalý link: http://hdl.handle.net/11104/0306031