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- Title
Predictive Crystal Plasticity Modeling of Single Crystal Nickel Based on First-Principles Calculations.
- Authors
Shimanek, John D.; Qin, Shipin; Shang, Shun-Li; Liu, Zi-Kui; Beese, Allison M.
- Abstract
To reduce reliance on experimental fitting data within the crystal plasticity finite element method, an approach is proposed that integrates first-principles calculations based on density functional theory (DFT) to predict the strain-hardening behavior of pure Ni single crystals. Flow resistance was evaluated through the Peierls–Nabarro equation using the ideal shear strength and elastic properties calculated by DFT-based methods, with hardening behavior modeled by imposing strains on supercells in first-principles calculations. Considered alone, elastic interactions of pure edge dislocations capture hardening behavior for small strains on single-slip systems. For larger strains, hardening is captured through a strain-weighted linear combination of edge and screw flow resistance components. The rate of combination is not predicted in the present framework, but agreement with experiments through large strains (~0.4) for multiple loading orientations demonstrates a possible route for more predictive crystal plasticity modeling through incorporation of analytical models of mesoscale physics.
- Subjects
CRYSTAL models; SINGLE crystals; EDGE dislocations; FINITE element method; DENSITY functional theory
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2022, Vol 74, Issue 4, p1423
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-022-05175-6