Shim, Jae-Hyeok Cho, Young Whan Kwon, Sang Chul Kim, Whung Whoe Wirth, Brian D. 2024-01-21T01:34:53Z 2024-01-21T01:34:53Z 2021-09-04 2007-01-08 0003-6951 https://pubs.kist.re.kr/handle/201004/134745 Molecular dynamics simulations of the interaction between a screw dislocation and a coherent bcc Cu precipitate in bcc Fe indicate that the screw dislocation stress field assists a martensitic transformation into a close-packed structure for precipitate diameters larger than 1.8 nm, resulting in a stronger obstacle to dislocation glide. The observed martensitic transformation mechanism agrees with the Nishiyama-Kajiwara [Jpn. J. Appl. Phys. 2, 478 (1963)] model. For coherent bcc Cu precipitates with diameter larger than 2.5 nm, the screw dislocation bypass mechanism becomes Orowan looping due to the coherency loss of the precipitates during the transformation. (c) 2007 American Institute of Physics. English AMER INST PHYSICS COMPUTER-SIMULATION EDGE DISLOCATION ALPHA-IRON ALLOY Screw dislocation assisted martensitic transformation of a bcc Cu precipitate in bcc Fe Article 10.1063/1.2429902 1 APPLIED PHYSICS LETTERS, v.90, no.2 APPLIED PHYSICS LETTERS 90 2 scie scopus 000243582000018 2-s2.0-33846228379 Physics, Applied Physics Article COMPUTER-SIMULATION EDGE DISLOCATION ALPHA-IRON ALLOY Dislocation Cu precipitate Fe-Cu Martensitic transformation Molecular dynamics Atomistic simulation