期刊
COMPOSITES PART B-ENGINEERING
卷 150, 期 -, 页码 7-13出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2018.05.033
关键词
Ultrafine eutectic; Nanoindentation; Strain rate sensitivity; Activation volume
资金
- National Natural Science Foundation of China [51701075]
- Fundamental Research Funds for the Central Universities [2017ms009]
- ERC Advanced Grant INTELHYB - Next Generation of Complex Metallic Materials in Intelligent Hybrid Structures [ERC-2013-ADG-340025]
Eutectic high entropy composites (EHECs) are novel class of material with excellent combination of strength and ductility, thus having a large potential for industrial applications. However, the mechanisms operating behind the trade-off between strength and ductility has not been investigated in detail. In this work, the influence of severe straining imposed by high-pressure torsion (HPT) was evaluated for a series of CoCrFeNiNbx alloys with varying Nb content (x molar ratio), hypoeutectic (x = 0.25), eutectic (x = 0.65) and hypereutectic (x = 0.80) compositions. Strain rate sensitivity (m) and activation volume (V*) calculations were calculated from constant strain rate (CSR) nanoindentation experiments, revealing that dislocation interaction with lamellae interfaces become the rate-limiting step for the strength-ductility trade-off in these EHECs.
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