SELECTED PROPERTIES OF TWO HIGH ENTROPY ALLOYS

1 DUFALOVÁ Zuzana
Co-authors:
1 MAZANCOVÁ Eva 2 SAKSL Karel 1 OSTROUSHKO Dmytro 2 ĎURIŠIN Martin 2 BALGA Dušan 2 SZABO Juraj 1 KUČERA Pavel
Institutions:
1 Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Ostrava, Czech Republic, EU, zuzana.dufalova.st@vsb.cz, eva.mazancova@vsb.cz, dimitrij.o@seznam.cz, pavel.kucera.st@vsb.cz
2 Institute of Material Research of SAS, Košice, Slovak Republic, EU, ksaksl@imr.saske.sk, mdurisin@imr.saske.sk, dbalga@imr.saske.sk, jszabo@imr.saske.sk
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
700-705
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
108 views / 24 downloads
Abstract

The work deals with two types of high entropy alloys (HEAs) of Fe4CrCuMnNi and Fe4CrCuMnNi type, which were laboratory synthesized by vacuum arc-melting method. Much cheaper Fe of higher portion replaced cobalt in high entropy alloy of CoCuCrMnNi type. Tensile tests and micro-hardness for both HEAs and a susceptibility to hydrogen induced cracking for Fe4CrCuMnNi were carried. Reached results in as cast state of both HEAs were compared each other. Mechanical properties were more favourable in case of Fe4CrCuMnNi. On average, yield stress was by 29 % higher, strength insignificantly lover by 14 MPa, while ductility by 2 % higher. Micro-hardness HV0.5 showed higher level in case of alloy with higher Fe content. Regarding hydrogen induced cracking of Fe4CrCuMnNi alloy under conditions in accord with NACE Standard TM0284-2013, Item No. 21215 the exposed samples were without any defects, even when length of sample was approx. 15 mm and diameter 3 mm only. Using Ni and Cr equivalents FCC+ BCC and/or BCC solid solution structures were found out. Microstructure, segregation and micro-fracture investigations were part of solution.

Keywords: High entropy alloy, tensile test, hardness, hydrogen induced cracking, microstructure

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