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The Effect of Processing Route on Properties of HfNbTaTiZr High Entropy Alloy

Title
The Effect of Processing Route on Properties of HfNbTaTiZr High Entropy Alloy
Authors
M?lek J.Z?ka J.Luk?? F.Vil?mov? M.Vlas?k T.???ek J.Melikhova O.Mach??kov? A.Kim H.-S.
Date Issued
2019-12
Publisher
MDPI AG
Abstract
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.
URI
https://oasis.postech.ac.kr/handle/2014.oak/101084
ISSN
1996-1944
Article Type
Article
Citation
Materials, vol. 12, no. 23, 2019-12
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김형섭KIM, HYOUNG SEOP
Dept of Materials Science & Enginrg
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