Plastic deformation mechanisms in BCC single crystals and equiatomic alloys: Insights from nanoindentation
Francisco Javier Dominguez-Gutierrez1
, Stefanos Papanikolaou1, Silvia Bonfanti1, Mikko Alava1,2
1NOMATEN Centre of Excellence, National Center for Nuclear Research, 05-400 Świerk/Otwock, Poland.
2Department of Applied Physics, Aalto University, P.O. Box 11000, 00076 Aalto, Espoo, Finland.
DOI:
https://doi.org/10.7494/cmms.2024.1.0826
Abstract:
Deformation plasticity mechanisms in alloys and compounds may reveal the material’s capacity towards optimal mechanical properties. We conducted a series of molecular dynamics (MD) simulations to investigate plasticity mechanisms due to nanoindentation in pure tungsten, molybdenum, and vanadium body-centered cubic single crystals, as well as the body-centered cubic, equiatomic, random solid solutions (RSS) of tungsten–molybdenum and tungsten–vanadium alloys. Our analysis focuses on a thorough, side-by-side comparison of dynamic deformation processes, defect nucleation, and evolution, along with corresponding stress–strain curves. We also checked the surface morphology of indented samples through atomic shear strain mapping. As expected, the presence of Mo and V atoms in W matrices introduces lattice strain and distortion, increasing material resistance to deformation and slowing down dislocation mobility of dislocation loops with a Burgers vector of 1/2 <111>. Our side-by-side comparison displays a remarkable suppression of the plastic zone size in equiatomic W–V RSS, but not in equiatomic W–Mo RSS alloys, displaying a clear prediction for optimal hardening response of equiatomic W–V RSS alloys. If the small-depth nanoindentation plastic response is indicative of overall mechanical performance, it is possible to conceive a novel MD-based pathway towards material design for mechanical applications in complex, multi-component alloys.
Cite as:
Dominguez-Gutierrez, F., Papanikolaou, S., Bonfanti, S., & Alava, M. (2024). Plastic deformation mechanisms in BCC single crystals and equiatomic alloys: Insights from nanoindentation. Computer Methods in Materials Science, 24(1), 37-49 . https://doi.org/10.7494/cmms.2024.1.0826
Article (PDF):
Keywords:
Nanoindentation, Alloys, Hardness, Machine learning interatomic potentials, Dislocation dynamics, Plasticity, Tungsten
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