期刊
ACTA MATERIALIA
卷 208, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2021.116714
关键词
Nanocomposites; High entropy alloys; High pressure torsion; Dual-phase materials; Heterodeformation
资金
- Karlsruhe Nano Micro Facility (KNMF)
- Deutsche Forschungsgemeinschaft (DFG) [SPP2006, WI 1899/32-1, STU 611/2-1, DI 1819/13-2]
- DFG [INST 211/719-1 FUGG]
High-pressure torsion is applied to join two disks of single-phase equiatomic fcc CoCrFeMnNi and bcc HfNbTaTiZr high entropy alloys, forming a bulk nanocomposite with alternating nano-lamellae of elongated nanocrystalline CoCrFeMnNi and mixed amorphous-nanocrystalline HfNbTaTiZr that exhibit complex microstructures. The joining process enables the design of novel HEA-based composites through non-equilibrium processing, resulting in chemical separation of the former bcc high entropy alloy and homogeneous elemental distribution in the fcc phase.
High-pressure torsion was applied to join two disks of single-phase equiatomic fcc CoCrFeMnNi and bcc HfNbTaTiZr high entropy alloys (HEAs). After 15 revolutions a bulk nanocomposite had developed with alternating nano-lamellae of elongated nanocrystalline CoCrFeMnNi and mixed amorphous-nanocrystalline HfNbTaTiZr, exhibiting complex microstructures with numerous vortex-like regions. While the fcc phase retains a rather homogeneous elemental distribution, the former bcc high entropy alloy experiences a chemical separation towards Ta-rich and Ta-poor phases. The joining of dissimilar HEAs under constrained conditions (cold shut) enables the design of novel HEA-based composites by non-equilibrium processing. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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