Study on Microstructure Evolution of 5059 High Magnesium Aluminum Alloy during Hot Deformation
Gleeble-3500 thermal simulation testing machine was used to conduct isothermal compression tests for high magnesium 5059 aluminum alloy.The microstructure of the alloy under different hot compression conditions was characterized using techniques such as metallographic microscopy,scanning electron microscopy,transmission electron microscopy and X-ray diffraction.The laws of grain morphology,second phase content,dislocation distribution,texture types and dynamic recrystallization evolution during the alloy hot deformation process were studied.The results show that after hot compression deformation of 5059 aluminum alloy,the coarse phase with a continuous grid distribution at low deformation temperatures becomes intermittent with the increase of hot compression deformation temperature,and the grain size gradually increases,the number of small subgrains between large grains gradually decreases,and some straight grain boundaries bend and transform into serration.The grains transform from small angle grain boundaries to large angle grain boundaries.At the same time,the degree of dislocation entanglement within the microstructure decreases,the dislocation density decreases,and the degree of recrystallization in the organization continues to increase.During the hot compression deformation process of 5059 aluminum alloy,there are mainly Goss texture,R texture,P texture,Brass texture and S texture.As the deformation temperature increases,the texture in the structure changes from deformation texture to recrystallization texture.
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