Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 9, Issue 4, Pages 7551-7557Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2020.05.069
Keywords
High-entropy alloy; Deformation twinning; Ultra-fine grain; Recrystallization; Fragmentation
Funding
- Hanbat National University
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The tensile properties of a CoCrFeMnNi high-entropy alloy, obtained by isothermal tensile testing and two-stage non-isothermal tensile testing, were compared. During the two-stage tensile testing, a tensile sample with the as-cast microstructure was loaded at 22 degrees C up to a strain level of 15%. Subsequently, the tensile specimen was re-loaded until it fractured at 500 degrees C and 700 degrees C. Formation of several steps was observed at the point where grain boundaries and deformation twin boundaries intersect after the two-stage tensile testing at 500 degrees C. The local deformation at the steps results in the fragmentation of the twin lamellae grains, which leads to the formation of an ultra-fine-grain structure. A high density of deformation twins was detected inside the ultra-fine grains. Furthermore, the grain fragmentation mechanism is discussed. (C) 2020 The Author(s). Published by Elsevier B.V.
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