Premium
One‐dimensional ledges and migration mechanism of incoherent interphase boundaries
Author(s) -
Huang Yunhao,
Wang Jincheng,
Wang Zhijun,
Li Junjie
Publication year - 2021
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576720015587
Subject(s) - interphase , nucleation , enhanced data rates for gsm evolution , boundary (topology) , materials science , crystal (programming language) , phase (matter) , grain boundary , condensed matter physics , crystallography , physics , chemistry , thermodynamics , microstructure , computer science , mathematics , telecommunications , mathematical analysis , genetics , quantum mechanics , biology , programming language
Since the edge‐to‐edge matching relationship of close‐packed planes on an incoherent interphase boundary was found, the one‐dimensional ledge migration mechanism has been put forward. However, owing to the lack of direct experimental evidence, the existence of the one‐dimensional ledge is still questioned and it is thus usually treated as just an assumption. In this study, focusing on the existence of one‐dimensional ledges and the migration mechanism of incoherent interphase boundaries, an atomic scale investigation on the migration of incoherent interphase boundaries in a body‐ to face‐centered cubic transformation has been carried out using the phase‐field crystal model. Simulation results demonstrated the presence of one‐dimensional ledges on incoherent interphase boundaries, but only on those boundaries with high atomic densities. The simulation results further showed that the interphase boundaries with one‐dimensional ledges migrate as a result of the nucleation and extension of the one‐dimensional ledge, similar to the mechanism for two‐dimensional ledges; meanwhile the interphase boundaries without one‐dimensional ledges migrate according to a continuous mechanism by random atomic jumping. Because it is difficult for one‐dimensional ledges to nucleate under low driving forces, interphase boundary migration based on the one‐dimensional ledge mechanism is slower than that based on the continuous mechanism. This study reveals the structures and mechanisms of complex transitions of incoherent interphase boundaries and can aid a deeper understanding of solid phase transformations.