Engineer in Situ Growth of alpha-Al2O3 Whiskers by Axial Screw Dislocations
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Engineer in Situ Growth of alpha-Al2O3 Whiskers by Axial Screw Dislocations
- 发表刊物：
- Journal Of Applied Mechanics-Transactions Of The Asame
- 摘要：
- Screw dislocation growth mechanism has recently drawn much attention in the micro/nanostructures due to its
unique existence conditions and impact on the morphology. Here we reported the observation of a screw dislocation growth of 9 single crystal α-Al2O3 whiskers via a facile and novel in situ synthesis method. By programming synthesis temperatures, we observed an interesting circular to polygonal thread morphology transition on the surface of the as-synthesized α-Al2O3 whiskers. Clear observations of the terraces and the axial dislocations under SEM and TEM characterizations revealed the presence of screw dislocation growth in the as-grown α-Al2O3 whiskers. This mechanism was further validated by analyzing both the supersaturation of the system and the thermodynamics of chemical reaction in the system. This strategy provides a detailed understanding of the screw dislocation growth in the Al2O3 whiskers as well as a new strategy for engineering Al2O3 whiskers.
- 合写作者：
- Chu, YH; Chen, PC; Tang, JD; Rao, PG
- 是否译文：
- 否
- 发表时间：
- 2017-03-16