Speaker
Description
Phase field crystal simulation of the structure transformation from cubic to hexagonal phase and its verification in TiAlN coating
Yi Kong, Chenshuang Wei, Xiong Shuai, Hong Mao, Li Chen, Sai Tang, Yong Du
State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, China
Abstract:
TiAlN-based coatings have been extensively used as a protective layer for tools in industries due to their excellent performances. The age hardening can improve hardness further which arises from metastable cubic AlN decomposed from cubic TiAlN. The metastable cubic AlN phase, however, would transform into stable hexagonal AlN at high temperature, largely deteriorated the performance of the coating. Due to fast dynamics and atomic resolution in nature, direct observation of the structure transform from cubic to hexagonal phase is hard to achieve experimentally. Instead, recently emerged Phase Field Crystal (PFC) simulation, with atomic spatial scale and diffusion dynamics time scale, is suitable to investigate this kind of structure transformation. In this work, we use PFC method to investigate structure transformation from cubic to hexagonal phase. The obtained atomic structures from the present PFC simulations are compared with TEM observation in TiAlN coating. The movements of dislocation core at different transformation stages are revealed and compared with each other, together with strain distributions analysis.
*Corresponding author.
E-mail address: yikong@csu.edu.cn (Yi Kong), chenli_927@126.com (Li Chen)
Acknowledgements
This work was funded by National Natural Science Foundation of China (Grant No. 51771234, 51775560, 52031017)
| Speaker Country | China |
|---|