期刊
NANOSCALE
卷 11, 期 23, 页码 11340-11350出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr00836e
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资金
- National Natural Science Foundation of China [51621063, 51722104, 51625103, 51790482, 51761135031, 51571157]
- National Key Research and Development Program of China [2017YFA0700701, 2017YFB0702301]
- 111 Project 2.0 of China [BP2018008]
- International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies
- Fok Ying-Tong Education Foundation [161096]
- China Postdoctoral Science Foundation [2016M602811, 2017T100744]
- Shaanxi Province innovative talents promotion Projects [2018KJXX-004]
- Fundamental Research Funds for the Central Universities
Compared with coarse-grained FeCoCrNi-based high entropy alloys (HEAs), their nanocrystalline (NC) siblings with ultra-high strength often suffer from notably reduced deformability. Here, to enhance the deformability of these NC HEAs without losing their high strength, we design equal layered nanotwinned (NT) Cu/HEA (HEA = FeCoCrNi) crystalline/crystalline nanolaminates (C/CNLs) with coherent crystalline/crystalline interfaces (CCIs). In contrast to the tenet that in conventional bimetal C/CNLs, the soft/ductile phase plays the dominant major role, we discover that in NT Cu/HEA C/CNLs, the hard HEA phase unusually makes more contribution to the plastic deformation. The underlying reason is that the soft NT Cu layers without dislocation pile-up serve as the dislocation donator and export abundant dislocations that transmit across the coherent CCIs into the hard HEA accepter, and thus trigger their great deformability. The size-dependent hardness was explained based on dislocation-based models considering the stability of extremely small nanotwins with thickness less than similar to 10 nm. These findings provide a new pathway to achieve great deformability of strong alloys with high lattice friction stresses in ultra-strong metallic composites: control the size of NT soft phases to suppress dislocation pile-up in conjunction with coherent CCIs to facilitate continuity of dislocation slip.
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