Study Of Microstructure And Texture Of Aluminum Alloy By Rolling And Multiple Constrain Deformation

By studying the related problems of the cold rolling process of DC5052, CC5052,CC5182aluminum alloy and the multiple constrained deformation and recrystallizationstructure and texture of3104and1050aluminum alloy, we studied the cold rollingprocess, multiple constrained deformation and textures. For the technological developmentof5xxx aluminum alloy and providing the basis of selecting DC and CC5083, CC5182aluminum alloy; develop large blocks of1050and3104aluminum alloy and ultrafinegrain refinement processing technology and theory. The main content and methods of thestudy include:(1) Texture distribution comparison analysis through thickness between DC vs CC5052aluminum alloy band after cold rolling: first analyze the date of pole fig of crystalorientation by x-ray diffraction and ODF of texture calculated use special software,analyze the relationship between the change of the texture and the reduction of the surface,the1/4of the layer thickness and the1/2of the layer thickness through differentreductions of DC and CC5052aluminum alloy.(2) Compare the cold rolling, annealing and recrystallized structures and textures ofCC5083and CC5182aluminum alloy; analyze the textures an the annealingmetallographic structure of electric furnace and salt furnace of CC5083and CC5182aluminum alloy through large reductions, further study the relationship between theannealing process after cold rolling and recrystallization structure and texture throughlarge reductions.(3) Analyze the structure and texture of1050aluminum alloy by multiple constraineddeformation cold rolling and direct cold rolling:1050aluminum alloy multipleconstrained cold rolling and annealed to gain thin, fine grains and over fine grains,optimize texture, less anisotropy and enhance the property.(4) Microstructure analysis of3104aluminum alloy by multiple constraineddeformation press: multiple constrained press the3104aluminum alloy on the materialstest machine with open channel die, so as to gain structure with fine grains, highdislocation density and high intensity.The microstructure may observed use transmission electron microscope and analysisthe microstructure use select area diffraction technology.The results show:(1) there is a gradient variation of the texture through thickness ofDC and CC5052aluminum alloy; in order to decrease the difference of the texture, the reduction of CC5052is smaller than DC5052aluminum alloy.(2) Be cased into electricalfurnace, hot up with unlimited speed followed the furnace hot up to different temperatureand annealed2h respectively, and be cased into salt-beth furnace, hot up quickly todifferent temperature and annealed30min respectively for DC5052and CC5052aluminum alloy. The recrystallization temperature is different from each other, and thetexture transformation degree is also difference form each other of four kind samples. Thestart temperature of recrystallization and start temperature of grains grow up of A samplesis310℃. The shape of grains after recrystallization is elongated; the recrystallizationtemperature and start temperature of grains grow up in the surface layer of the samples isevidencely higher than in the inner layer.(3) Comparison of multiple constraineddeformation cold rolling and direct of1050aluminum alloy: multi-pass multipleconstrained deformation cold rolling is more conductive to grain fragmentation andrefining, and can achieve tiny equiaxed grains and large size of1050aluminum alloywith tiny sub-grain. The grain size of the multiple constrained deformation cold rolling istend to be larger than the direct cold rolling; after fully recrystallized of the three passmultiple constrained deformation cold rolling, it achieved strong cube component andweak β fiber rolling texture.(4) Multiple constrained deformation can cause severe plasticdeformation which can effectively refine the grain size of3104aluminum alloy. Afterlarge strain multiple constrained deformation, the micro structure consisted of dislocationcell, extended dislocation boundaries and high misorientation has developed into large sizeof slip band and the dislocation cell structure with large angle foliated interface, the degreeof the grain refinement has been increased, the misorientation decreased and thedistribution tend to be homogeneous.