Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 898, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162765
Keywords
Medium-entropy alloy; Phase transformation; Mechanical property; Strengthening mechanism
Categories
Funding
- Ministry of Science and Technology, Taiwan [MOST 106-2218-E-002-025, MOST 110-2224-E-002-010]
- National Taiwan University (NTU), Taiwan
- Ministry of Science and Technology, Taiwan
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This study focuses on developing a low-cost medium entropy alloy with desirable mechanical properties. By adjusting the component ratio and adding silicon, a Fe50Mn17.5Cr12.5Co10 Ni5Si5 MEA with a single FCC phase was successfully developed. The processed alloy exhibits improved mechanical properties, with the cryogenic-deformed MEA showing higher yield strength and tensile strength.
The present work focuses on developing a low-cost medium entropy alloy (MEA) with desirable mechanical properties according to the benchmark CoCrFeMnNi high entropy alloy (MEA). By adjusting the ratio of each component and adding silicon to the system, the Fe50Mn17.5Cr12.5Co10 Ni5Si5 MEA with a single face-centered cubic (FCC) phase was developed. After homogenization, hot rolling, cold rolling, and annealing, fully recrystallized MEA specimens with grain sizes ranging from 10 mu m to 149 mu m were used for tensile tests. The microstructure of the elongated MEAs showed a epsilon-martensite transformation from the FCC phase to the hexagonal close-packed (HCP) phase, indicating the stacking fault energy (SFE) of the MEA was significantly reduced. The room-temperature deformed MEA showed improved mechanical properties in yield strength and tensile strength than the CoCrFeMnNi MEA. Meanwhile, the volume fraction of the HCP phase in cryogenic-deformed MEA is much larger than that in room-temperature deformed MEA; its yield strength was increased by two times, while the tensile strength exceeded the level of 1 GPa. (C) 2021 Elsevier B.V. All rights reserved.
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