Activation Volume and Energy for Dislocation Nucleation in Multi-Principal Element Alloys
Abstract
:1. Introduction
2. Experimental
3. Results and Discussion
4. Conclusions
- The pop-in load marking incipient plasticity was found to decrease with the increase of temperature for each of the three alloys indicating a thermally activated event.
- At all the temperatures, the pop-in shear stress was not constant but rather occurred over a range of loads. At room temperature, the values of the pop-in shear stress ranged over – for three alloys.
- Using a statistical approach, the evaluated activation volume and enthalpy for the five-component multi-principal alloys were around 10 Å3 and 0.5 eV, respectively. The small values of activation volume and energy suggest heterogeneous dislocation nucleation.
- The CoCrFeMnNi and Al0.1CoCrFeNi multi-principal alloys showed two times higher activation volume and energy compared to CoCrNi medium entropy alloy and pure Ni suggesting complex cooperative motion of atoms for deformation in these systems.
- Vacancy migration was ruled out as a possible nucleation mechanism because of the small values of activation volume and energy.
- Surface defects like ledges, vacancy clusters, and hot-spots created by asymmetry generated due to thermal vibration could be potential sites for heterogeneous dislocation nucleation in these alloys during nano-indentation.
Author Contributions
Funding
Conflicts of Interest
References
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Alloys | Er (GPa) | Activation Volume (Å3) | Activation Energy (eV) |
---|---|---|---|
Ni | 195 ± 7 | 4.12 | 0.23 ± 0.008 |
CoCrNi | 195 ± 6 | 4.69 | 0.27 ± 0.01 |
CoCrFeMnNi | 180 ± 4 | 9.01 | 0.50 ± 0.007 |
Al0.1CoCrFeNi | 190 ± 5 | 8.04 | 0.47 ± 0.009 |
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Mridha, S.; Sadeghilaridjani, M.; Mukherjee, S. Activation Volume and Energy for Dislocation Nucleation in Multi-Principal Element Alloys. Metals 2019, 9, 263. https://doi.org/10.3390/met9020263
Mridha S, Sadeghilaridjani M, Mukherjee S. Activation Volume and Energy for Dislocation Nucleation in Multi-Principal Element Alloys. Metals. 2019; 9(2):263. https://doi.org/10.3390/met9020263
Chicago/Turabian StyleMridha, Sanghita, Maryam Sadeghilaridjani, and Sundeep Mukherjee. 2019. "Activation Volume and Energy for Dislocation Nucleation in Multi-Principal Element Alloys" Metals 9, no. 2: 263. https://doi.org/10.3390/met9020263