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Cryogenic-temperature fracture toughness analysis of non-equi-atomic V10Cr10Fe45Co20Ni15 high-entropy alloy

Title
Cryogenic-temperature fracture toughness analysis of non-equi-atomic V10Cr10Fe45Co20Ni15 high-entropy alloy
Authors
Jo, Yong HeeDoh, Kyung-YeonKim, Dong GeunLee, KwanhoKim, Dae WoongSung, HyokyungSohn, Seok SuLee, DonghwaKim, Hyoung SeopLee, Byeong-JooLee, Sunghak
Date Issued
Nov-2019
Publisher
ELSEVIER SCIENCE SA
Abstract
Representative face-centered-cubic (FCC) high-entropy alloys (HEAs) or medium-entropy alloys (MEAs), e.g., equi-atomic CoCrFeMnNi or CrCoNi alloys, have drawn many attentions due to the excellent damage-tolerance at cryogenic temperature. The investigation of fracture toughness at 77 K is basically required for the reliable evaluation of high-performance alloys used for cryogenic applications; however, it has been rarely carried out for the non-equi-atomic FCC HEAs yet. In this study, tensile and fracture toughness tests were conducted on the non-equi-atomic V10Cr10Fe45Co20Ni15 alloy, and the results were compared with those of the equi-atomic CoCrFeMnNi and CrCoNi alloys. The present alloy shows a good damage tolerance at cryogenic temperature with tensile strength of 1 GPa and elongation of similar to 60%. The K-JIc fracture toughness values are 219 and 232 MPam(1/2) at 298 and 77 K, respectively, showing the increase in toughness with decreasing temperature. This increase results from the absence of twins at 298 K and the increased propensity to twin formation at 77 K, which is well confirmed by the variation of stacking fault energies (SFEs) by using Ab-initio calculations. The mechanical properties of the present alloy are actually similar or slightly lower than those of the other CoNiCr or FeMnCoNiCr alloy; instead, this study provides that neither composition nor certain elements are the most important factors dictating damage-tolerance of HEAs or MEAs. (C) 2019 Elsevier B.V. All rights reserved.
URI
http://oasis.postech.ac.kr/handle/2014.oak/100053
ISSN
0925-8388
Article Type
Article
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, vol. 809, 2019-11
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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