On the deformation texture of square-shaped deep-drawing commercially pure Ti sheet

The effect of crystallographic texture on the deformation behavior of commercially pure titanium (c.p. Ti) sheet in dual-temperature square-shaped deep-drawing process has been investigated. The thickness strain measurement shows that the increase in drawing temperature improves the drawability of c.p. Ti. The orientation distribution functions (ODFs) by X-ray texture analysis show that the c.p. Ti in a sheet form has the pronounced {0002} basal type normal direction (ND)-fiber, which show strong {h k i l}//ND-fiber textures with four types of complete ND-fiber with (0002), ((1) over bar2 (1) over bar5), ((1) over bar2 (1) over bar2), (02 (1) over bar1) orientations and two types of partial ND-fiber of ((3) over bar6 (3) over bar1) and (01 (1) over bar3). It is noted that the orientation densities of the predominant ND-fibers (0 0 0 2), (12 5) and (3 6 (3) over bar 1) are proportionate to the drawing heights of c.p. Ti cups, but the others are less correlated. The enhancement of (12 15) (10 0) texture component indicates that a better drawability is due to the easier metal flow. Besides, at high temperature the orientation density of ((1) over bar2 (1) over bar0) [0001] texture component reveals that the active deformation behavior along c-axis could lead to a complex (c + a)-axis gliding. In summary, the complex active slip systems of c.p. Ti sheet intensify the ND-fiber textures during dual-temperature condition, thus result in better drawability of c.p. Ti sheets, which could further confirm the dominant effect of crystallographic texture on deformation behavior that results in a microshear band microstructure. (C) 2002 Elsevier Science B.V. All rights reserved.