| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Processing Fundamentals
|
| Presentation Title |
Anomalous Temperature Effect on Diffusion-controlled Solidification Time during Diffusion Brazing |
| Author(s) |
Oluwadara C. Afolabi, Olanrewaju A. Ojo |
| On-Site Speaker (Planned) |
Oluwadara C. Afolabi |
| Abstract Scope |
The anomalous increase in diffusional solidification time with increase in bonding temperature during diffusion brazing has been widely observed experimentally in the literature; however, no adequate explanation has been provided. In this work, systematic theoretical modelling is used to study the fundamental mechanisms responsible for this anomaly. It is found that inadequate increase in diffusional solidification rate to overcome the accompanying increase in volume of liquid with increase in temperature would result in the anomaly. Results also show that reduction of diffusional solidification rate with increase in temperature, which can occur despite an attendant increase in diffusivity, would likewise cause the anomaly. Moreover, the study reveals that it is possible for concentration-averaged diffusion coefficient to reduce with increase in temperature when diffusivity is concentration-dependent, and this can equally result in the anomaly. The identified mechanisms which offer new understanding about the phenomenon are validated by experimental observations in the literature. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Joining, Other |