Abstract
Deformation mechanisms of high entropy alloys (HEAs) at cryogenic temperatures have attracted extensive research interest. We used in situ neutron diffraction to study the tensile behavior of a face-centered-cubic HEA at 77 and 15 K and compared its stacking fault energy (SFE) at ambient and cryogenic temperatures. The SFE dropped from 28 mJm-2 at 293 K to 11 mJm-2 at 15 K, leading to the transition of deformation mechanism from deformation-induced twinning to martensite phase transformation. As a result, excellent balance of strength and ductility was achieved at both temperatures. This finding highlights the importance
of SFE for cryogenic alloy design.
of SFE for cryogenic alloy design.
Original language | English |
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Pages (from-to) | 166-170 |
Number of pages | 5 |
Journal | Scripta Materialia |
Volume | 178 |
Early online date | 19 Nov 2019 |
DOIs | |
Publication status | Published - 15 Mar 2020 |
Keywords
- high entropy alloy
- cryogenic deformation
- neutron diffraction