Grain growth in polycrystalline materials can proceed in two different modes: normal or abnormal mode. In the normal grain growth, most grain boundaries (GBs) migrate smoothly as time goes on. In the abnormal grain growth, some grains grow preferentially at the expense of their neighbor grains, whereas most boundaries between the matrix grains remain almost immobile by the pinning effect from the dispersed particles or grain boundary segregation. Notable among the characteristics of the AGG is the jerky motion (go-and-stop motion) of the grain boundaries surrounding the abnormally growing grains. This jerky motion has clearly been observed both in the in-situ and ex-situ experiments, and seems to be an natural consequence of the discontinuous interaction between GBs and the pinning particles (and/or segregated atoms). In this study we investigate the detailed process of the jerky motions of GBs in AGG by using a phase-field simulation. We show that the AGG takes place in a chain reaction like a series of collapsing dominoes. The jerky motion of GBs appears to be not a subsidiary result from AGG, but closely related with a key process in the fundamental mechanism of AGG

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/28878 must be provided.