Strengthening of Nanosized bcc Cu Precipitate in bcc Fe: A Molecular Dynamics Study
- Strengthening of Nanosized bcc Cu Precipitate in bcc Fe: A Molecular Dynamics Study
- 심재혁; 김동익; 정우상; 조영환; Brian D. Wirth
- Molecular dynamics simulation; Dislocation; Precipitate; Fe-Cu; Critical resolved shear stress; Orowan mechanism; martensitic transformation
- Issue Date
- Materials transactions
- VOL 50, NO 9, 2229-2234
- The strengthening effect of nanosized Cu precipitates in bcc Fe has been studied by performing molecular dynamics simulations of the
interaction between a screw dislocation and a coherent bcc Cu precipitate of 1–4nm diameter in bcc Fe. The dislocation detachment mechanism
changes from shear at a precipitate diameter of 4 and 2.5 nm in the twinning and anti-twinning directions, respectively, due to the coherency loss
caused by the screw dislocation assisted martensitic transformation of the precipitate. The screw dislocation detachment mechanism with the
larger, transformed precipitates involves annihilation-and-renucleation, or Orowan looping in the twinning vs. anti-twinning direction,
respectively. The critical resolved shear stress (CRSS) of the screw dislocation-precipitate interaction increases with increasing precipitate size,
and is strongly dependent on the precipitate structure and detachment mechanism. The CRSS is much larger in the anti-twinning direction.
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