Effect of solid-solution strengthening on deformation mechanisms and strain hardening in medium-entropy V1-xCrxCoNi alloysopen access
- Authors
- Chung, Hyun; Kim, Dae Woong; Cho, Woo Jin; Han, Heung Nam; Ikeda, Yuji; Ishibashi, Shoji; Kormann, Fritz; Sohn, Seok Su
- Issue Date
- 10-5월-2022
- Publisher
- JOURNAL MATER SCI TECHNOL
- Keywords
- Medium-entropy alloy; Tensile property; Solid-solution strength; Strain-hardening rate; Stacking fault energy
- Citation
- JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, v.108, pp.270 - 280
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
- Volume
- 108
- Start Page
- 270
- End Page
- 280
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/141079
- DOI
- 10.1016/j.jmst.2021.07.042
- ISSN
- 1005-0302
- Abstract
- High- and medium-entropy alloys (HEAs and MEAs) possess high solid-solution strength. Numerous investigations have been conducted on its impact on yield strength, however, there are limited reports regarding the relation between solid-solution strengthening and strain-hardening rate. In addition, no attempt has been made to account for the dislocation-mediated plasticity; most works focused on twinning- or transformation-induced plasticity (TWIP or TRIP). In this work we reveal the role of solidsolution strengthening on the strain-hardening rate via systematically investigating evolutions of deformation structures by controlling the Cr/V ratio in prototypical V 1- x Cr x CoNi alloys. Comparing the TWIP of CrCoNi with the dislocation slip of V 0.4 Cr 0.6 CoNi, the hardening rate of CrCoNi was superior to slip-band refinements of V 0.4 Cr 0.6 CoNi due to the dynamic Hall-Petch effect. However, as V content increased further to V 0.7 Cr 0.3 CoNi and VCoNi, their rate of slip-band refinement in V 0.7 Cr 0.3 CoNi and VCoNi with high solid-solution strength surpassed that of CrCoNi. Although it is generally accepted in conventional alloys that deformation twinning results in a higher strain-hardening rate than dislocation-mediated plasticity, we observed that the latter can be predominant in the former under an activated huge solid-solution strengthening effect. The high solid-solution strength lowered the cross-slip activation and consequently retarded the dislocation rearrangement rate, i.e., the dynamic recovery. This delay in the hardening rate decrease, therefore, increased the strain-hardening rate, results in an overall higher strain-hardening rate of V -rich alloys. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholar.korea.ac.kr/handle/2021.sw.korea/141079)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.