Influence of Annealing Temperature on Microstructure and Mechanical Properties of Gr.4 Pure Titanium Sheet
The cold-rolled Gr.4 pure titanium sheet was annealed at different temperatures,and its grain size,grain boundary distribution,dislocation density,and micro-texture were analyzed in association with mechanical properties by using EBSD(electron backscattering diffraction).The results show that the grain size slightly varies with the annealing temperatures of 740,780,820℃.There may be five unique α/α orientation differences of 10.53°,60°,60.83°,63.26° and 90° after annealing,and the misorientation angles of five unique α/α grain boundaries display a random distribution.The intragranular dislocation density of α grains decreases with increasing under-cooling temperatures.The sample exhibits a strong<01(-1)0 fiber texture when annealed at 780℃.This is consistent with the close-packed direction of Ti atoms,indicating the best capability to resist the Ti atom slipping,resulting in the highest strength and good strength plasticity matching.
Gr.4 pure titaniumsheetannealing heat treatmentmicrostructureEBSD
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