Microstructure of two-phase Al-1.7 at% Cu alloy deformed by equal-channel angular pressing
Abstract
The microstructural changes of an aged Al-1.7 at% Cu alloy associated with severe plastic deformation have been studied by transmission electron microscopy (TEM) and energy-filtered transmission electron microscopy (EF-TEM). θ‧ precipitates are almost completely dissolved after eight passes of equal-channel angular (ECA) pressing, and nearly single-phase α with a fine grain size of approximately 500 nm is obtained. When a severely deformed sample is aged for 24 h at 100°C, precipitation of equiaxed θ phase is observed along the grain boundaries, whereas only GP zones are formed in the undeformed sample. The dissolution and precipitation processes in severely deformed Al-1.7 at% Cu alloy have been examined by TEM and energy-filter mapping.
- Publication:
-
Acta Materialia
- Pub Date:
- 2001
- DOI:
- 10.1016/S1359-6454(00)00308-6
- Bibcode:
- 2001AcMat..49...21M
- Keywords:
-
- Equal-channel angular pressing (ECAP);
- Microstructure;
- Transmission electron microsocpy;
- Cold working;
- Aluminium alloy