Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 68, Issue -, Pages 16-29Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.06.042
Keywords
High-entropy alloys; Metallic glasses; Nanolaminated micropillars; Size effect
Funding
- National Natural Science Foundation of China [51722104, 51625103, 51790482, 51761135031]
- National Key Research and Development Program of China [2017YFA0700701]
- 111 Project 2.0 of China [BP2018008]
- Fok Ying-Tong Education Foundation [161096]
- Fundamental Research Funds for the Central Universities [xzy022019071]
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This study explores the deformation behaviors and mechanical properties of Cu/HEA and Cu/MG nanolaminated micropillars with different intrinsic layer thicknesses and extrinsic pillar diameters. The results show that the metastable HEA layers in Cu/HEA micropillars dominate the deformation, while transformation occurs in Cu/MG micropillars. The intrinsic size h and extrinsic size D have a strong coupling effect on the strength of both types of micropillars.
Metastable high entropy alloys (HEAs) and amorphous metallic glasses (MGs), with the chemical disordered character, are intensively studied due to their excellent performance. Here, we introduce Cu to separately constrain these two metastable materials and comparatively investigate their deformation behaviors and mechanical properties of Cu/HEA FeCoCrNi and Cu/MG CuZr nanolaminated micropillars in terms of intrinsic layer thickness h and extrinsic pillar diameter D. The metastable HEA layers, as the hard phase in Cu/HEA micropillars, are stable and dominate the deformation, while transformation (crystallization) occurs in MG which plays a minor role in deformation of Cu/MG micropillars. The h-controlled deformation mode transits from the D-independent homogenous-like deformation at large h to the D-dependent shear banding at small h in both Cu/HEA and Cu/MG micropillars. Although both Cu/HEA and Cu/MG micropillars exhibit a maximum strain hardening capability controlled by h, the former manifests much lower hardening capability compared with the latter. The intrinsic size h and extrinsic size D have a strong coupling effect on the strength of Cu/HEA and Cu/MG micropillars. The strength of strength of Cu/HEA micropillars exhibits the D-dependent transition from smaller is stronger to smaller is weaker with increasing h. By contrast, the strength of Cu/MG micropillars exhibits the transition from bulk-like D-independent behavior at large h to small volume D-dependent behavior (smaller is stronger) at small h. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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