Source Publication (e.g., journal title)
Materials Research Letters
Document Type
Article
Publication Date
2019
DOI
https://doi.org/10.1080/21663831.2019.1658233
Abstract
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.
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.
Recommended Citation
Chen, S. Y.; Wang, L.; Li, W. D.; Tong, Y.; Tseng, K. K.; Tsai, C. W.; Yeh, J. W.; Ren, Y.; Guo, W.; Poplawsky, J. D.; and Liaw, P. K., "Peierls barrier characteristic and anomalous strain hardening provoked by dynamic-strain-aging strengthening in a body-centered-cubic high-entropy alloy" (2019). Biosystems Engineering and Soil Science Publications and Other Works.
https://trace.tennessee.edu/utk_biospubs/16
Submission Type
Publisher's Version