Room-Temperature Solid Solution Softening in Fe-V Binary System
- Room-Temperature Solid Solution Softening in Fe-V Binary System
- 박지혜; 심재혁; 이영국
- Molecular dynamics; Dislocation; Solid solution softening; Fe-V; Alloy
- Issue Date
- Metals and Materials International
- VOL 22, NO 1, 7-11
- Molecular dynamics simulations of the glide of an edge dislocation in the bcc matrix of Fe-V alloys were performed to investigate the room-temperature solid solution softening by V atoms. For this purpose, the glide velocity of an edge dislocation was calculated as a function of V concentration under the shear stresses of 100-300MPa using the Fe-V cross-potential constructed newly in the present study. Whereas the solid solution hardening occurred as the V concentration is less than 0.13 at% or more than 0.5 at%, the room-temperature solid solution softening was observed in Fe-(0.13-0.5) at% V alloys. The solid solution softening occurring in Fe-(0.13-0.5) at% V alloys was caused by the accelerated growth velocity of kinks by solute V atoms. The increase in kink velocity happened when the interatomic distance between solute V atoms was similar to the length of dislocation kinks.
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