Thermal Stability of Nanocrystalline Gradient Inconel 718 Alloy
Abstract
Gradient structures containing nanograins in the surface layer have been introduced into Inconel 718 (IN718) nickel-based alloy using the surface mechanical grinding treatment technique. The thermal stability of the gradient IN718 alloy was investigated. Annealing studies reveal that nanograins with a grain size smaller than 40 nm exhibited significantly better thermal stability than those with larger grain size. Transmission electron microscopy analyses reveal that the enhanced thermal stability was attributed to the formation of grain boundaries with low energy configurations. This study provides new insight on strategies to improve the thermal stability of nanocrystalline metals.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 11, 2021
- Source ID
- 10.3390/cryst11010053
Entities
People
- Bo Yang
- Haiyan Wang
- Jie Ding
- Jin Li
- Sichuang Xue
- Tongjun Niu
- Xinghang Zhang
- Yifan Zhang
- Zhongxia Shang
Organizations
- Office of Naval Research
- United States Department of Energy