Study on Hot Deformation Behavior of Spray-Forming and Nano-Sized Al-Cu-Mg Alloy.

Spray-forming Al-Cu-Mg alloy was compressed to 70% deformation at 300-450 °C and strain rates of 0.01-10.00 s on a Gleeble-3180 system. The microstructures of the hot deformed, sprayforming, nano-sized Al-Cu-Mg alloys were studied through electron backscatter diffraction. Constitutive equation and parameter Z were established to describe the deformation behavior of the alloy at high temperature, and the Q value was 155.67 KJ·mol. 3D power dissipation and processing maps were analyzed under strain values of 0.3, 0.6, 0.9, and 1.2. When the strain was increased from 0.6 to 0.9, the processing performance changed remarkably. Dynamic recovery occurred at low temperature and high strain rate, whereas dynamic recrystallization took place at increased temperature and low strain rate. The region in 400-450 °C and 0.01 s-0.08 s exhibited an improved processing performance.