In this paper, the compression stress-strain curves of 7050 Al-alloy under various deformation conditions were obtained, and the recrystallization structures were analyzed. The main parameters of dynamic recrystallization model were determined. The rationality of the model parameters were verified by hot compression and extrusion. The results show that the accuracy of the model is high enough for predicting the recrystallization of the 7050 Al-alloy during hot deformation. Comparison of the experiment and calculated results in hot compression shows that the maximum relative error of the recrystallization fraction is 11.4%. Comparison of the experiment and calculated results in hot extrusion shows that the maximum relative error of the recrystallization fraction is 13.0%, and that of the recrystallization grain size is 14.9%.
There are many ways to increase the combustion rate of pulverized coal. In this paper, it is improve pulverized coal combustion rate by the method of microwave modification. In order to study the mechanism of modification on pulverized coal, microstructure and chemical compositions of pulverized coal before and after modification were studied. The results show that the microwave modification only changes the nature of PC itself without change component in the lower microwave power condition. And with the modified time extension, the pore number of PC surface gradually increases and the specific surface area enlarges. The highest combustion rate of modified-coal is 85.4%, and it is increase 11.1% than the raw coal in the experiment condition.
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