| About this Abstract |
| Meeting |
TMS Specialty Congress 2024
|
| Symposium
|
Symposium on Digital & Robotic Forming 2024
|
| Presentation Title |
Utilizing Strain Rate Jump Testing to Predict Flow Formability of Al Alloys Sensitive to Portevin-Le Chatelier Instabilities |
| Author(s) |
Mary Cecilia Mulvaney, David E. Stegall, Stephen J. Hales, James M. Fitz-Gerald, Sean R. Agnew |
| On-Site Speaker (Planned) |
Mary Cecilia Mulvaney |
| Abstract Scope |
Predicting the flow formability of Al alloys is challenging due to the incremental deformation, complex loading path, and wide range of strain rates characteristic of the process. State-of-the-art research efforts have primarily focused on formability metrics derived from ambient temperature, constant strain rate uniaxial tensile testing. However, Al alloys in formable tempers tend to exhibit serrated Portevin-Le Chatelier (PLC) flow. The appearance of PLC instabilities implies a negative strain rate sensitivity, loss of tensile area reduction capacity, and decreased formability. Elevated temperature and strain rate jump tensile tests of relevant Al alloys were conducted to investigate the effects of rapid changes in strain rate (analogous to a forming increment by a passing roller) on common formability metrics. Emphasis was placed on the character/extent of PLC instabilities using digital image correlation strain measurements. The outcome of this work highlights the possibility of predicting flow formability using strain rate jump testing. |
| Proceedings Inclusion? |
Definite: Other |