Influence of temperature on void collapse in single crystal nickel under hydrostatic compression
- Employing atomistic simulations, we investigated the void collapse mechanisms in single crystal Ni during hydrostatic compression and explored how the atomistic mechanisms of void collapse are influenced by temperature. Our results suggest that the emission and associated mutual interactions of dislocation loops around the void is the primary mechanism of void collapse, irrespective of the temperature. The rate of void collapse is almost insensitive to the temperature, and the process is not thermally activated until a high temperature (~1200–1500 K) is reached. Our simulations reveal that, at elevated temperatures, dislocation motion is assisted by vacancy diffusion and consequently the void is observed to collapse continuously without showing appreciable strain hardening around it. In contrast, at low and ambient temperatures (1 and 300 K), void collapse is delayed after an initial stage of closure due to significant strain hardening around the void. Furthermore, we observe that the dislocation network produced during void collapse remains the sample even after complete void collapse, as was observed in a recent experiment of nickel-base superalloy after hot isostatic pressing.
Author: | Mahesh R. G. PrasadORCiDGND, Anupam NeogiORCiDGND, Napat VajraguptaORCiDGND, Rebecca JanischORCiDGND, Alexander HartmaierORCiDGND |
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URN: | urn:nbn:de:hbz:294-83763 |
DOI: | https://doi.org/10.3390/ma14092369 |
Parent Title (English): | Materials |
Publisher: | MDPI |
Place of publication: | Basel |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2021/10/12 |
Date of first Publication: | 2021/05/02 |
Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
Tag: | Open Access Fonds hot isostatic pressing; molecular dynamics; void |
Volume: | 14 |
Issue: | 9, Article 2369 |
First Page: | 2369-1 |
Last Page: | 2369-14 |
Note: | Article Processing Charge funded by the Open Access Publication Fund of Ruhr-Universität Bochum. |
Institutes/Facilities: | Interdisciplinary Centre for Advanced Materials Simulation (ICAMS) |
open_access (DINI-Set): | open_access |
Licence (English): | Creative Commons - CC BY 4.0 - Attribution 4.0 International |