Research on the Anisotropy of Tensile Properties and Impact Toughness of Ti75 Alloy Plate

The anisotropy of tensile properties and impact toughness of Ti75 alloy plate were investigated by analyzing the microstructures and textures. The results showed that the ultimate tensile strength,yield strength,elongation and impact toughness in transverse direction( TD) were better than those in rolling direction( RD). Yield strength in transverse direction was much greater than that in rolling direction,therefore,yield ratio in transverse direction was much greater than that in rolling direction.The textures in the rolling Ti75 alloy plate was formed by two components: basal ( B) textures, \0002\<11 \overline20> and \10 \overline1 3\ <11 \overline2 0> and transverse (\mathrmT) texture \11 \overline2 0\<10 \overline10> which led to different Schmid factors in TD and RD tensile tests. The differences of yield strengths in transverse and rolling directions were mainly caused by the slip systems,which were differently activated by different textures,while the tensile strength depended on strengthening effects of elements. Different main influencing factors accounted for the differences of yield ratios in different directions in the Ti75 alloy plate.