Extrusion of aluminum alloys often leads to  fiber texture. Exploring the superplastic behaviors of these extruded alloys can provide useful reference data for the understanding of particle/textured matrix interaction. In this study, the extruded Al-Al3Ni eutectic alloy with  fiber texture was chosen as the test material. Some results were reviewed from our previous work. The extrusion temperature was varied to have different distributions of the Al3Ni particles. With the particles residing only intergranularly in the as-extruded state, the maximum elongation, which occurs under the initial strain rate of 6.3x10-3 s-1, is about 300 %. For the material possessing some intragranular particles, heavy dislocations tangling around these particles leads to inferior ductility. The deformation associated with dislocation tangling is more homogeneous, contributing to the  pole contour closer aligning to tensile axis. TEM results of superplastic-like deformation indicate that dislocation activities in most subgrains are extremely low or absent, and primary slip is the major dislocation activity of the remaining subgrains Ca-added Al-Al3Ni eutectic alloys can be extended, by one order higher strain rate from 1.6 x 10-3 sec-1 to 1.2 x 10-2 sec-1, to about 250 % elongation.
|Number of pages||6|
|Journal||Key Engineering Materials|
|Publication status||Published - 2000 Jan 1|
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering