| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Formability and Spring-back Issues in Ultra-high Strength Steels and High Strength Aluminum Alloys
|
| Presentation Title |
Retrogression Forming and Reaging for Forming and Joining AA7075-T6 Sheet |
| Author(s) |
Eric M. Taleff, Danny Nikolai |
| On-Site Speaker (Planned) |
Eric M. Taleff |
| Abstract Scope |
Retrogression forming was used to stamp a complex part shape from AA7075-T6 Alclad sheet at 200°C with only modest strength loss (8% or less), which was fully recovered through a single reaging heat treatment at 120°C after forming. Together, these steps comprise the retrogression forming and reaging (RFRA) process. Increased ductility at 200°C is the result of increased tearing resistance. This is accompanied by a decrease in flow stress by about one third and rapid stress relaxation, which can reduce residual stress by 15 to 40%. Both these effects should reduce spring back. The RFRA approach was then applied to join AA7075-T6 sheets by self pierce riveting. RFRA for forming and joining may enable production of AA7075-T6 components with a yield strength in the neighborhood of 500 MPa.
This work was supported by the U.S. National Science Foundation under grant CMMI-1634495. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Shaping and Forming, Joining |