6061 And 6069 Aluminum Alloy Hot Deformation Behavior Of The Research

The data about testing was gotten by isothermal compression testing method with Gleeble-1500thermal simulator. The deformation behaviors and evolution behaviors of the microstructure for6069aluminum alloy and6061aluminum alloy have been investigated. The interdependences of flow stress σ, strain rateε and deformation T for the alloy have been studied with the aids of regression analysis. The characteristic of deformation microstructure of the alloy at high temperatures have also been studied with the aids of OM. The main contents are as follows:1)A near steady plastic flow of6069aluminum alloy and6061aluminum alloy was confirmed during isothermal compression deformation in the range of300℃～450℃and0.01s-1～10s-1. The flow stress increases with decreasing of deformation temperature and increasing of strain rate. The stress is sensitive to rate positively.2) There is the process of hot activation under high temperature deformation for6069aluminum alloy and6061aluminum alloy. The interrelations of flow stress, strain rate and deformation temperature can be described by a hyperbolic sine function for the alloy during the deformation process. That’s to say, the flow stress can be described by temperature-compensated strain rate, the so-called Zener-Hollomon parameter.3) With the method of regression analysis the four constants and the flow stress function of6069aluminum alloy and flow stress equation The deformation activation energy of6069aluminum alloy is lower than that of6061aluminum alloy.4) The characteristic of deformation microstructure at high temperatures for6069aluminum alloy have been studied. The condition of dynamic recovery and dynamic recrystallization took place in6069aluminum alloy had been explored.