Deformation mechanisms of FeCoCrNiMo0.2 high entropy alloy at 77 and 15 K

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

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.

Details

Original languageEnglish
Pages (from-to)166-170
Number of pages5
JournalScripta Materialia
Volume178
Early online date19 Nov 2019
Publication statusPublished - 15 Mar 2020

Keywords

  • high entropy alloy, cryogenic deformation, neutron diffraction