Elsevier

Scripta Materialia

Volume 200, 15 July 2021, 113919
Scripta Materialia

On temperature and strain-rate dependence of flow serration in HfNbTaTiZr high-entropy alloy

https://doi.org/10.1016/j.scriptamat.2021.113919Get rights and content

Abstract

Plastic instability manifested as the serrated flow on stress-strain curves of metal alloys is generally detrimental to their processing and manufacturing. The flow serration in the HfNbTaTiZr alloy is reported in the present work and its dependence on temperatures (573-823K) and strain rates (5 × 10−5 s−1-1 × 10−3 s−1) is investigated with experiments. The notable transition of the onset strain of the serrated flow from a declining (normal behavior) to rising (inverse behavior) trend with increasing temperature at applied strain rates is modeled successfully with a theoretical framework. The success of the model in predicting the onset strain as a function of temperature and strain rate represents a possibility of theoretically constructing a process window for the alloy under examination and beyond.

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Declaration of Competing Interest

There are no conflicts of interest to declare.

Acknowledgement

S. C. acknowledges the financial support from the National Natural Science Foundation of China (No. 52001271). Y.T. acknowledges the financial support programs, Taishan Scholars Youth Expert Program. P. K. L. very much appreciates the supports from (1) the National Science Foundation (DMR-1611180 and 1809640) with program directors, Drs. J. Yang, G. Shiflet, and D. Farkas and (2) the US Army Research Office (W911NF-13–1-0438 and W911NF-19–2-0049) with program managers, Drs. M.P. Bakas, S.N.

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