Abstract
Residual stresses were measured through the thickness of friction-stir processed (FSP) 6061-T6 aluminum-alloy plates using neutron diffraction. Two different specimens were prepared to study the relationship between residual stress distributions through the thickness of the plate and angular distortion: (Case 1) a plate processed with both stirring pin and tool shoulder, i.e., a typical FSP plate subjected to both plastic deformation and frictional heat, and (Case 2) a plate processed only with the tool shoulder, i.e., subjected mainly to the frictional heating. The measured residual stress profiles show relatively small through-thickness residual stress variations in Case 1, while there is a significant through-thickness residual stress variations in Case 2. The main cause of the geometric angular distortion could be related to the non-uniform distribution of the frictional heat generated by the tool shoulder leading to the asymmetric distributions of the residual stress through the thickness of the FSP plate.
| Original language | English |
|---|---|
| Pages (from-to) | 64-69 |
| Number of pages | 6 |
| Journal | Materials Science and Engineering: A |
| Volume | 437 |
| Issue number | 1 |
| DOIs | |
| State | Published - Nov 10 2006 |
Funding
This work is supported by the NSF International Materials Institutes (IMI) Program under contract DMR-0231320. This work has benefited from the use of the Los Alamos Neutron Science Center at the Los Alamos National Laboratory. This facility is funded by the US Department of Energy under Contract W-7405-ENG-36. The authors would like to thank A. Frederick and T. Sisneros for their help during experiments.
| Funders | Funder number |
|---|---|
| NSF International Materials Institutes | |
| U.S. Department of Energy | W-7405-ENG-36 |
| Innovative Medicines Initiative | DMR-0231320 |
Keywords
- Aluminum alloys
- Angular distortion
- Friction-stir processing
- Neutron diffraction
- Residual stress