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Trade-off between tensile property and formability by partial recrystallization of CrMnFeCoNi high-entropy alloy

Title
Trade-off between tensile property and formability by partial recrystallization of CrMnFeCoNi high-entropy alloy
Authors
Bae, Jae WungMoon, JongunJang, Min JiYim, DamiKim, DaeyongLee, SunghakKim, Hyoung Seop
POSTECH Authors
Lee, SunghakKim, Hyoung Seop
Date Issued
Aug-2017
Publisher
ELSEVIER SCIENCE SA
Abstract
In this work, a high-entropy alloy of equiatomic CrMnFeCoNi was processed by vacuum induction melting followed by rolling. After cold rolling, annealing for one hour was conducted during which the annealing temperature was varied from 650 to 1000 degrees C. This was done to investigate the effect of microstructure on tensile properties and stretch formability (defined as the capability of materials to undergo plastic.deformation under biaxial stretching). The strengthening effect of partial recrystallization, with a remaining small fraction of sigma phase particles, led to improved yield and tensile strengths while minimizing the loss of ductility. Fully recrystallized microstructure resulted in a slight increase in ductility, and a considerable decrease in strength, during a tensile test. On the other hand, the results for stretch formability suggest that partial recrystallization had exactly the opposite results. In this regard, the present results raise a new issue to consider when utilizing partial recrystallization for improvement of mechanical properties.
Keywords
INDUCED PLASTICITY STEELS; PRINCIPAL ELEMENTS; THERMAL-EXPANSION; GRAIN-GROWTH; MICROSTRUCTURE; DEFORMATION; EVOLUTION; RESISTANCE; BEHAVIOR; DESIGN
URI
http://oasis.postech.ac.kr/handle/2014.oak/50431
DOI
10.1016/j.msea.2017.07.079
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 703, page. 324 - 330, 2017-08
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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