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Transformation Induced Plasticity Effects of a Non-Equal Molar Co-Cr-Fe-Ni High Entropy Alloy System

1
Research Institute for Energy Equipment Materials, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, China
2
Tianjin Key Laboratory of Materials Laminating Fabrication and Interface control Technology, Tianjin 300132, China
3
State Key Laboratory for Advance Metals and Materials, University of Science and Technology Beijing, Beijing 10083, China
*
Authors to whom correspondence should be addressed.
Metals 2018, 8(5), 369; https://doi.org/10.3390/met8050369
Received: 27 April 2018 / Revised: 13 May 2018 / Accepted: 18 May 2018 / Published: 21 May 2018
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Abstract

Metastability-engineering strategy is an important topic for high entropy alloys (HEAs), owing to the transformation-induced plasticity effect (TRIP). In this work, TRIP effects of Co-Cr-Fe-Ni HEAs are investigated. Results indicate the tensile deformation-induced martensitic transformation occurs in Co35Cr25Fe40−xNix (x = 0–15 at %) HEAs. The excellent combination of tensile strength (760 MPa–1000 MPa) and elongation (65–35%) owe to solid solution strengthening of Co and Cr, and the TRIP effect. In non-equal molar Co-Cr-Fe-Ni systems, with the decrease of Ni content, the values of stacking fault energy (SFE) decrease; thus, TRIP phenomena occurs. Based on the experimental investigation in three different regions of the Co-Cr-Fe-Ni multicomponent phase diagram, the face-centered cubic structured Co-Cr-Fe-Ni HEAs with VEC of ~8.0 is more metastable, and TRIP phenomena are more likely to occur. View Full-Text
Keywords: high entropy alloys; metastability; transformation induced plasticity effect; valence electron concentration; stacking fault energy high entropy alloys; metastability; transformation induced plasticity effect; valence electron concentration; stacking fault energy
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Fang, W.; Chang, R.; Ji, P.; Zhang, X.; Liu, B.; Qu, X.; Yin, F. Transformation Induced Plasticity Effects of a Non-Equal Molar Co-Cr-Fe-Ni High Entropy Alloy System. Metals 2018, 8, 369.

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