Deformation Behavior Of Ti Research Articles

Dislocation Structures in Titanium

Titanium alloys are important materials for aerospace applications in wide temperature ranges, i.e., from cryogenic to elevated temperatures. Since most commercial alloys are used in near alpha phase (h.c.p.) compositions, it is very important to understand the deformation behavior of Ti at those temperature ranges. In particular, in recent years, the critical resolved shear stresses in major slip systems such as basal, prismatic and pyramidal planes have been one of the most crucial topics in titanium metallurgy. Furthermore, the existence and abundance of dislocations with the c + a Burgers vector in the latter two slip systems became controversial and of great interest for engineers who process the alloys for hardware products. Proving the existence of such dislocations requires very elaborate procedures in which one should establish a two beam condition on two independent planes, both of which belong to the <1123> zone axis, and also observe if the dislocation contrasts disappear on those two planes but not on the rest of the planes which do not contain the same zone axis.