Journal
SCRIPTA MATERIALIA
Volume 200, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.113919
Keywords
High-entropy alloys; Serrated flow; Portevin-Le Chatelier effect; Dynamic strain aging; Theoretical modeling
Categories
Funding
- National Natural Science Foundation of China [51901077, 52001271]
- Taishan Scholars Youth Expert Program
- National Science Foundation [DMR-1611180, 1809640]
- US Army Research Office [W911NF-13-1-0438, W911NF-19-2-0049]
- High Entropy Materials Center from The Featured Areas Research Center Program within the of the Higher Education Sprout Project by the Ministry of Education (MOE)
- Ministry of Science and Technology (MOST) in Taiwan [MOST 109-2634-F-007-024]
- DOE Office of Science [DE-AC02-06CH11357]
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The study investigates the flow serration in the HfNbTaTiZr alloy at different temperatures and strain rates, successfully modeling the transition of the onset strain behavior with a theoretical framework. The model's success in predicting the onset strain as a function of temperature and strain rate represents the possibility of constructing a process window for the alloy theoretically.
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 x 10(-5) s(-1)-1 x 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. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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