| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Strain Hardening of Al-Cu Alloys Investigated with In-situ Neutron Diffraction |
| Author(s) |
Brian K. Milligan, Dong Ma, Amit Shyam, Amy Clarke |
| On-Site Speaker (Planned) |
Brian K. Milligan |
| Abstract Scope |
Cast Al-Cu alloys have long been of interest due to their high strength derived from nano- and micro-scale precipitates. While the effect of precipitate structure on strength has been well characterized, the strain hardening behavior in these alloys is less understood. This work focuses on strain hardening behavior of a commercial Al-Cu alloy with varying heat treatments and microstructure. Transmission electron microscopy was used to study the precipitate structure after aging, and in-situ neutron diffraction was used to study the strain hardening behavior during tensile testing as a function of precipitate structure. Of interest was the transition of precipitate shearing to Orowan looping as a function of precipitate size at the grain scale during strain hardening. A constitutive model describing this transition was developed. The transition was found to not only be dependent on precipitate thickness, but also grain orientation relative to the direction of applied stress. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |