Journal
MATERIALS RESEARCH LETTERS
Volume 7, Issue 12, Pages 475-481Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2019.1658233
Keywords
Strain hardening; temperature dependence; dislocation width; serrated flow; dynamic strain aging
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Funding
- National Science Foundation of US [DMR-1611180, 1809640]
- U.S. Army Research Office project [W911NF-13-1-0438, W911NF-19-2-0049]
- Ministry of Science and Technology in Taiwan [MOST 107-3017-F-007-003]
- DOE Office of Science [DE-AC02-06CH11357]
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The temperature effect on the mechanical behavior of the HfNbTaTiZr high entropy alloy (HEA) was investigated at 77-673 K. The decrease of the yield strength with increasing the temperature was mechanistically analyzed by considering contributions from various strengthening mechanisms. An anomalous dependence of strain hardening on temperature was observed and was justified to be caused by dynamic strain aging (DSA) as an extra strengthening mechanism at elevated temperatures. A model was constructed to split the overall strain hardening into forest hardening and DSA hardening, both of which were theoretically quantified at all temperatures considered. [GRAPHICS] . IMPACT STATEMENT The work quantifies the height of Peierls barriers in the bcc HfNbTaTiZr HEA, and reveals dynamic strain aging as the strengthening mechanism causing the anomalous strain hardening at elevated temperatures.
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