Open AccessВырожденная структура двойников превращения и оценка плотности дислокаций мартенситных кристаллов
Author(s) -
М.П. Кащенко,
Н.М. Кащенко,
В.Г. Чащина
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.12.48532.04ks
Subject(s) - longitudinal wave , superposition principle , diffusionless transformation , allowance (engineering) , martensite , materials science , excited state , dislocation , condensed matter physics , deformation (meteorology) , degenerate energy levels , beam (structure) , softening , wave propagation , physics , optics , composite material , atomic physics , quantum mechanics , mechanical engineering , microstructure , engineering
In the dynamic theory of martensitic transformations, the wave mechanism of controlling martensite crystal growth is determined by the superposition of wave beams of quasi-longitudinal (or longitudinal) waves carrying the “tensile–compression” deformation in the orthogonal directions. The wave beam formation is considered to be a result of the formation of excited (vibrational) states. The existence of transformation twins is interpreted as a result of a matched propagation with respect to long-wave ( l waves) and short-wave ( s waves) shifts. The matching condition is analyzed for the γ–α martensitic transformation in iron-base alloys. It is shown for the first time that the transition to a degenerate twin structure with the allowance for the medium discreteness enables one to estimate the dislocation density in crystals with habit {557}, which agrees with that observed experimentally.