High-entropy CoCrFeMnNi alloy subjected to high-strain-rate compressive deformation
Journal
Materials Characterization
Journal Volume
147
Pages
193-198
Date Issued
2019
Author(s)
Tsai, S.-P.
Tsai, Y.-T.
Chen, Y.-W.
Chen, P.-J.
Chiu, P.-H.
Chen, C.-Y.
Lee, W.-S.
Yeh, J.-W.
Abstract
Split Hopkinson pressure bar (SHPB) experiments were conducted to investigate the mechanical behavior and microstructure evolution of CoCrFeMnNi alloy (Cantor alloy) under three strain rates (3 × 103, 6 × 103, and 9 × 103 s−1) at room temperature. The corresponding deformed samples were studied mainly by transmission electron microscopy (TEM), with the focus on the defected structures. The results indicate that the flow stress and strain-hardening rate are both significantly dependent on strain rate. Nano-twinning occurred during deformation at 9 × 103 s−1, whereas dislocation-glide was dominant during deformation at 3 × 103 s−1. The transition of deformation modes under different dynamic compression rates is discussed.
Type
journal article