Effect of annealing treatment on microstructure and properties of cold rolled Al/Ti laminate sheet
The influence of different annealing process parameters on microstructure and microhardness of cold rolled aluminum/titanium laminate sheet was studied by means of scanning electron microscopy,electron backscatter diffraction technique,X-ray diffraction and microhardness tester.The effects of annealing temperature and holding time on the recrystallization behavior of aluminum and titanium layers were analyzed.The results show that the microstructure of the cold rolled aluminum and titanium layers is mainly composed of heavily elongated deformed grains along the rolling direction,and the distribution is uneven in the thickness direction.As the annealing temperature and the holding time increase,the width of the diffusion layer also increases to a certain extent.When annealed at 400 ℃,the aluminum layer metal has undergone recrystallization,while the titanium layer metal can only observe a small amount of recrystallized grains when annealed at 500 ℃.As the annealing temperature further increases,the recrystallization ratio and grain size of the two metal layers significantly increase.The increasing of holding time leads to an increase in the recrystallization fraction of the titanium layer,while there is no significant change in the aluminum layer.In addition,AlTi,Al2Ti and other intermetallic compounds also have a certain effect on the microhardness of the composite interface.
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