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논문 기본 정보

자료유형
학술저널
저자정보
Hae Don Park (Gyeongsang National University) Jong Woo Won (Korea Institute of Materials Science) Jougun Moon (Pohang University of Science and Technology (POSTECH)) Hyoung Seop Kim (Pohang University of Science and Technology (POSTECH)) Hyokyung Sung (Gyeongsang National University) Jae Bok Seol (Gyeongsang National University) Jae Wung Bae (Max-Planck-Institut Für Eisenforschung GmbH) Jung Gi Kim (Gyeongsang National University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.1
발행연도
2023.1
수록면
95 - 107 (13page)
DOI
10.1007/s12540-022-01215-7

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Understanding the deformation-induced transformation-induced plasticity (TRIP) in high-entropy alloys (HEAs) is criticalfor obtaining desired mechanical properties. In this study, the deformation-induced phase transformation behavior ofFe55Co17.5Ni10Cr12.5Mo5HEA was investigated by microstructural characterization using scanning electron microscopybasedtechniques. The results showed the initiation of body-centered cubic (BCC) variants at the intersections of hexagonalclose-packed (HCP) variants. The growth of BCC variants occurred through the HCP phase with a Burgers orientationrelationship. Heterogeneous strain distributions at the phase boundaries also induced additional BCC variants with unusualcrystallographic characteristics, although the growth of these BCC variants was inhibited. The TRIP behavior during acryogenic-temperature tensile test of the Fe55Co17.5Ni10Cr12.5Mo5alloy provided an extra strain-hardening rate by absorbingplastic deformation energy to initiate BCC and HCP variants and additional strain-hardening capability of the transformedBCC phase. Because of the extra strain-hardening rate, the Fe55Co17.5Ni10Cr12.5Mo5alloy achieved an outstanding tensilestrength (1.2 GPa) and ductility (0.81) combination at cryogenic temperatures.

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