High strain rate sensitivity of hardness in quinary Ti-Zr-Hf-Cu-Ni high entropy metallic glass thin films |
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| Affiliation: | 1. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;2. State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;3. School of Materials Science and Engineering, Northwestern Polytechnical University, Xian 710072, China |
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| Abstract: | 
Quinary Ti-Zr-Hf-Cu-Ni high-entropy metallic glass thin films were produced by magnetron sputter deposition. Nanoindentation tests indicate that the deposited film exhibits a relatively large hardness of 10.4±0.6 GPa and a high elastic modulus of 131±11 GPa under the strain rate of 0.5 s−1. Specifically, the strain rate sensitivity of hardness measured for the thin film is 0.05, the highest value reported for metallic glasses so far. Such high strain rate sensitivity of hardness is likely due to the high-entropy effect which stabilizes the amorphous structure with enhanced homogeneity. |
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| Keywords: | High-entropy metallic glasses Thin films Nanoindentation Strain rate sensitivity |
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