期刊
SCRIPTA MATERIALIA
卷 175, 期 -, 页码 1-6出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.08.036
关键词
Medium entropy alloys; Hierarchical microstructure; Partial recrystallization; Yield strength; Deformation twinning
类别
资金
- DFG [SFB TR 103]
- Alexander von Humboldt Foundation
We demonstrate the formation of a hierarchical microstructure by optimized combination of Mo-doping and thermo-mechanical processing in a NiCoCr medium-entropy-alloy (MEA) that results in a significant improvement in yield-strength (similar to 775 MPa) and ultimate-tensile-strength (similar to 1200 MPa) with an elongation to fracture up to 35%. Addition of Mo slows down the recrystallization kinetics of the cold-rolled alloy at 700 degrees C. After 4 h annealing, the microstructure comprises soft recrystallized and hard non-recrystallized zones, dispersed sigma precipitates, annealing twins and retained stacking faults/nanotwins that are shown to contribute to the overall mechanical behavior. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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