| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
|
Neutron and X-ray Scattering in Materials Science and Engineering
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| Presentation Title |
Rationalization of non-uniform radial hardness distribution in friction self-piercing riveted Al-7075 using x-ray scattering and advanced microscopy techniques |
| Author(s) |
Rakesh R. Kamath, Yuan Li, Jan Ilavsky, Yi-Feng Su, Yiyu Wang, Jiheon Jun, Yong Chae Lim, Zhili Feng, Dileep Singh |
| On-Site Speaker (Planned) |
Rakesh R. Kamath |
| Abstract Scope |
Friction self-piercing riveting (FSPR) is a unique hybrid joining technique that combines the advantages of riveting (i.e., mechanical interlocking) and friction-stir processing (i.e., frictional heat and solid-state bonding) to join low-ductility alloys. In the current study, Al-7075 sheets were joined using FSPR for automotive applications. Significant changes in microhardness were observed along the joint cross-section. Advanced microscopy, i.e., scanning transmission electron microscopy and electron back-scatter diffraction, revealed noticeable changes in the size and number of (Mg,Zn)-rich precipitates and Al-matrix grain size due to the unique thermomechanical transients experienced at different regions during FSPR. Further, the size distribution and number of precipitates were characterized over a statistically representative volume using ultra-small-angle, small-angle and wide-angle x-ray scattering at the Advanced Photon Source. The relative contributions of these microstructural characteristics (i.e., solute concentration, grain size, precipitate nature) were estimated using existent formulations and correlated to the observed property (microhardness) values across different regions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Joining, Characterization |