About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
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Symposium
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2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
Effect of Grain Refinement on the Mechanical Behavior of the Cr40Co40Ni20 Medium-entropy Alloy |
Author(s) |
Gustavo Bertoli, Lucas B. Otani, Diego Araujo Santana, Amy J. Clarke, Claudio S. Kiminami, Francisco G. Coury |
On-Site Speaker (Planned) |
Diego Araujo Santana |
Abstract Scope |
The equiatomic CrCoNi medium-entropy alloy (MEA) stands out as one of the toughest materials ever made. The great combination of mechanical properties is partly due to the high work-hardening rate provided by the twinning-induced plasticity (TWIP) effect. While Cr additions improve solid solution strengthening, Co additions increase the tendency for transformation-induced plasticity (TRIP) effect to occur, which could provide even higher work-hardening rates than the TWIP effect. Thus, the Cr- and Co-rich Cr40Co40Ni20 MEA was selected for the present study. This MEA was produced, hot and cold formed, and characterized in the annealed and deformed states, this alloy displayed promising mechanical properties and the TRIP effect is shown to occur extensively during deformation. Furthermore, this alloy displayed significant strengthening propensity by grain refinement as evidenced by a Hall-Petch curve. The impact of grain size on the TRIP/TWIP activation will be discussed. |
Proceedings Inclusion? |
Undecided |