Numerical Simulation On Wedge Deformation Of Spray-deposited 5A06 Aluminum Alloy

The spray deposited performs usually contain a certain quantity of porosity, thus have the poor property when using directly. Whether this material would be using well or not lies on the property after the densification. Therefore to get a required mechanical characteristics, the porous performs must be further dandified and deformed plastically. The traditional technology such as extrusion, screw pressing, forging, rolling can not get full dense material, however new technology named cyclic pressing was used to density the spray deposited 5A06 aluminum alloy, in which the large deformation can be obtained through the sum-up of local deformation. This method can also solve the problems in traditional process and greatly reduce the producing cost of the post-densification. The main researches in this study are as follows:1. A study on the behavior of hot compression of spray-deposited 5A06 aluminum alloy were performed. A constitutive equation was established by analyzing the relationships of the flow stress and the strain and the deformation temperatures and strain rates。The flow stress during hot compression can be described by the hyperbolic sine relation of Zener-Hollomon parameter Z. The proposed equation gives a good agreement with the measured values, which consequently can be as the numeric-simulated flow stress model of spray-deposited 5A06 aluminum alloy during hot deformation。2. In this study, the changes of the microstructure and the hardness have revealed the relationships of temperatures and the strain rates.3. A theoretic relationship to relative density and high reduction was established in the single axial compress, the results of FEM show that the theory values and the FEM results give a good agreement with the measured values.4. By the finite element software, the effects of the different process parameters on the deformation and densification in the cyclic pressing were researched. The results show that the two face cyclic pressing is needed and the reasonable temperature is 450℃~500℃, the reasonable velocity is0.5~ 1.0mm/s.