Micropillar Compression Study on the Deformation Behavior of Electrodeposited Ni–Mo Films
Abstract
:1. Introduction
2. Materials and Methods
2.1. Film-Processing by Electrodeposition
2.2. Microstructure Characterization of the As-Grown Film by Transmission Electron Microscopy
2.3. Characterization of the Crystallographic Texture of the Ni–Mo Films
2.4. Micropillar Compression Test
2.5. Characterization of the Microstructure of the Micropillars before and after Compression
3. Results
3.1. Microstructure of the As-Deposited Ni Films with Low and High Mo Contents
3.2. Compression Behavior of the Micropillars Fabricated from the Ni–Mo Films
3.3. Changes of the Microstructure in the Ni Film with High Mo Content during Micropillar Compression
4. Discussion
5. Conclusions
- The film with high (5.3 at.%) Mo concentration had a much larger yield strength (1.3 GPa) than the value obtained for low (0.4 at.%) Mo content (0.35 GPa). This difference can be attributed to the higher solute hardening, the much smaller grain size and the higher defect density in the former sample. In film HMo, nanotwins with an average spacing of ~5 nm were formed while considerable twinning was not observed in specimen LMo. In addition, a strong 200 texture was observed for film LMo while no considerable texture was detected in sample HMo, and this change also contributed to the higher yield strength of the latter specimen.
- The Ni film with low Mo concentration exhibited strain-hardening in the studied strain range, yielding a maximum compressive stress of 0.86 GPa. At the same time, layer HMo showed a fast hardening to the stress of 2.4 GPa which was followed by a continous softening between the strains of 0.04 and 0.26.
- The strain-softening for film HMo cannot be explained by grain coarsening since the average grain size remained about 26 nm during compression. On the other hand, a decrease of the twin density during compression was observed by comparing the TEM images taken on the pillars before and after deformation. This detwinning process caused the observed softening.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Gubicza, J.; Kapoor, G.; Ugi, D.; Péter, L.; Lábár, J.L.; Radnóczi, G. Micropillar Compression Study on the Deformation Behavior of Electrodeposited Ni–Mo Films. Coatings 2020, 10, 205. https://doi.org/10.3390/coatings10030205
Gubicza J, Kapoor G, Ugi D, Péter L, Lábár JL, Radnóczi G. Micropillar Compression Study on the Deformation Behavior of Electrodeposited Ni–Mo Films. Coatings. 2020; 10(3):205. https://doi.org/10.3390/coatings10030205
Chicago/Turabian StyleGubicza, Jenő, Garima Kapoor, Dávid Ugi, László Péter, János L. Lábár, and György Radnóczi. 2020. "Micropillar Compression Study on the Deformation Behavior of Electrodeposited Ni–Mo Films" Coatings 10, no. 3: 205. https://doi.org/10.3390/coatings10030205