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Spark plasma sintering of gas atomized high-entropy alloy HfNbTaTiZr

Published online by Cambridge University Press:  18 September 2018

Frantisek Lukac ,
Martin Dudr ,
Radek Musalek ,
Jakub Klecka ,
Jakub Cinert ,
Jan Cizek ,
Tomas Chraska ,
Jakub Cizek ,
Oksana Melikhova  and
Jan Kuriplach
...Show all authors
Frantisek Lukac*
Affiliation:
Department of Materials Engineering, Institute of Plasma Physics CAS, 182 00 Praha 8, Czech Republic; and Faculty of Mathematics and Physics, Charles University, 180 00 Praha 8, Czech Republic
Martin Dudr
Affiliation:
Department of Materials Engineering, Institute of Plasma Physics CAS, 182 00 Praha 8, Czech Republic
Radek Musalek
Affiliation:
Department of Materials Engineering, Institute of Plasma Physics CAS, 182 00 Praha 8, Czech Republic
Jakub Klecka
Affiliation:
Department of Materials Engineering, Institute of Plasma Physics CAS, 182 00 Praha 8, Czech Republic
Jakub Cinert
Affiliation:
Department of Materials Engineering, Institute of Plasma Physics CAS, 182 00 Praha 8, Czech Republic
Jan Cizek
Affiliation:
Department of Materials Engineering, Institute of Plasma Physics CAS, 182 00 Praha 8, Czech Republic
Tomas Chraska
Affiliation:
Department of Materials Engineering, Institute of Plasma Physics CAS, 182 00 Praha 8, Czech Republic
Jakub Cizek
Affiliation:
Faculty of Mathematics and Physics, Charles University, 180 00 Praha 8, Czech Republic
Oksana Melikhova
Affiliation:
Faculty of Mathematics and Physics, Charles University, 180 00 Praha 8, Czech Republic
Jan Kuriplach
Affiliation:
Faculty of Mathematics and Physics, Charles University, 180 00 Praha 8, Czech Republic
Jiri Zyka
Affiliation:
Research and development department, UJP PRAHA a.s., 156 10 Praha, Zbraslav, Czech Republic
Jaroslav Malek
Affiliation:
Research and development department, UJP PRAHA a.s., 156 10 Praha, Zbraslav, Czech Republic
*
a)Address all correspondence to this author. e-mail: lukac@ipp.cas.cz
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Abstract

A homogeneous HfNbTaTiZr high-entropy alloy was successfully processed via powder metallurgy route. For the initial powder feedstock material fabrication, the electrode induction-melting gas atomization procedure was used, resulting in a spherical powder morphology and dual bcc phase composition distinguishable within the individual particles. Spark plasma sintering was then used for the powder compaction at sintering temperatures ranging from 800 to 1600 °C. By the characterization of the compact microstructures, lattice defects (microscopic porosity and vacancy-like misfit defects), and mechanical properties (hardness and three-point bending strength), the sintering conditions were optimized to obtain a fully dense, homogeneous, single-phase bcc material. It was found that such properties are achieved when sintering at 80 MPa pressure for 2 min at temperatures above 1200 °C, where the single bcc phase structure exhibited ductile behavior with considerable flexural strength and ductility at ambient temperature. Positron annihilation spectroscopy was used to characterize the evolution of atomic and mesoscale defects during optimization of the sintering process.

Keywords

alloysinteringpowder metallurgy

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Type
Article
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Journal of Materials Research , Volume 33 , Issue 19: Focus Issue: Fundamental Understanding and Applications of High-Entropy Alloys , 14 October 2018 , pp. 3247 - 3257
Copyright
Copyright © Materials Research Society 2018 

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References

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