| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
|
| Presentation Title |
Structural and Chemical Features of Borides Precipitated within the Transient Liquid (TLP) Bonded Superalloys |
| Author(s) |
Xiaobing Hu, Vinayak P. Dravid |
| On-Site Speaker (Planned) |
Xiaobing Hu |
| Abstract Scope |
Boron is widely used as an important melting point depressant (MPD) element in filler materials in transient liquid phase (TLP) bonding, where various kinds of borides will precipitate in the diffusion affect zone (DAZ) and influence the integral mechanical properties of bonded materials. In this talk, we will show the structural and chemical features of M3B2 and M5B3 borides formed in DAZ in a TLP-bonded Ni-based superalloy at atomic scale. Different from previous knowledge that various metallic atoms distributed randomly within M3B2 and M5B3 lattice, by means of atoms resolved element mapping technique, we directly show the chemical ordering within M3B2- and M5B3-type boride. Additionally, the crystallographic orientation relationships (ORs) among M3B2, M5B3 and matrix and their associated interfacial features are defined. The interfacial features between M3B2/M5B3 and matrix, and the unique dendrite intergrowth between M3B2 and M5B3 are also rationalized by means of phase transformation crystallography. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |