Abstract
The microstructure transformation and texture characteristics of friction stir welded joint of titanium alloy were studied from two aspects of temperature and flow deformation. The deformation mechanism of friction stir welding of titanium alloy and the basis of optimization process were analyzed and revealed from the perspective of high temperature plastic forming by means of temperature field measurement, finite element simulation and hot compression test. The mechanism of texture transformation during welding below transformation temperature is analyzed and explained by flow field simulation and Electron-backscatter diffraction results. At the same time, according to the deformation mechanism and metallographic observation results, the grain refinement mechanism in each zone of the joint was analyzed and discussed, and the microstructure and texture transformation mechanism of each zone of the joint were explained, which provided theoretical support for the regulation of microstructure and texture. Based on our work, we expect the wide application of FSW in producing high-quality titanium alloy joints.
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