Mechanisms of Microstructure Refinement in Titanium during “abc” Deformation at 400°C
Mechanical behavior and microstructure evolution of commercial pure titanium during successive compressions of samples along three orthogonal directions (or so-called “abc” deformation) at 400°C and strain rate 10-3s-1 were studied. The cumulative S- curve demonstrates a steady state flow stage following the intensive strengthening. The microstructure evolution of titanium during first increments of “abc” deformation is associated with twinning and shear deformation. Further deformation results in microstructure refinement due to transformation of coincidence site lattice twin boundaries to high-angle arbitrary ones and formation of high-angle deformation induced boundaries. Another mechanism of new grains formation is continuous dynamic recrystallization.
Jing Tao Wang, Roberto B. Figueiredo and Terence G. Langdon
S. V. Zherebtsov et al., "Mechanisms of Microstructure Refinement in Titanium during “abc” Deformation at 400°C", Materials Science Forum, Vols. 667-669, pp. 439-444, 2011