Abstract
In situ neutron diffraction experiments have been performed to investigate the deformation mechanisms on CoCrFeNi high entropy alloys (HEAs) with various amounts of doped Cu. Lattice strain evolution and diffraction peak analysis were used to derive the stacking fault probability, stacking fault energy, and dislocation densities. Such diffraction analyses indirectly uncovered that a lower degree of Cu doping retained the twinning behavior in undoped CoCrFeNi HEAs, while increasing the Cu content increased the Cu clusterings which suppressed twinning and exhibited prominent dislocation strengthening. These results agree with direct observations by transmission electron microscopy.
| Original language | English |
|---|---|
| Article number | 141901 |
| Journal | Applied Physics Letters |
| Volume | 124 |
| Issue number | 14 |
| DOIs | |
| State | Published - Apr 1 2024 |
Funding
L.A., Z.L., Y.G., and P.K.L. are grateful for the support from the U.S. National Science Foundation (No. DMR 1809640). Q.D. and H.B. are grateful for the internal funding from the School of Materials Science and Engineering, Zhejiang University. Y.Z. is supported through the Laboratory Directed Research and Development Program at Idaho National Laboratory under the Department of Energy (DOE) Idaho Operations Office (an agency of the U.S. Government) under Contract No. DE-AC07-05ID145142.