An atomistic gateway into capturing twin nucleation in crystal plasticity

ABSTRACT

Capturing twin nucleation in crystal plasticity is a long-standing problem due to its localisation and site sensitivity. Quantifying local energy to induce a stable twin is a unique challenge and profoundly informs the microstructural evolution. We performed nudged elastic band atomistic calculations identifying minimum energy path and activation energy for $\left\{10\overline{1}2\right\}$ twin nucleation. This enables gauging the transformations from an initial state without twins to a final state with twins under various boundary conditions. The role of stress and atomic structure in twinning can be understood by the minimum energy path, energy barrier and relaxed energy.

KEYWORDS:

• Twinning
• defects
• NEB
• energy barrier
• molecular dynamics Simulations

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Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

Research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-15-2-0025.