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Abstract
High purity titanium (Ti) thin strip was prepared by rolling with large deformation and was characterized by the means of Transmission Electron Microscopy (TEM), selected area diffraction (SAED) pattern, high-resolution (HRTEM) analysis, as well as Transmission Kikuchi Diffraction (TKD). It is found that there are face-centered cubic (FCC) Ti laths formed within the matrix of hexagonal close packing (HCP) Ti. This shows that the HCP-FCC phase transition occurred during the rolling, and a specific orientation relationship (OR) between HCP phase and FCC phase obeys ⟨0001⟩α// ⟨001⟩FCC and {100}α//{110}FCC. The ORs of HCP-FCC phase transition are deeply studied by TKD pole figure and phase transformation matrix. It is found that the derived results via pole figure and transformation matrix are equivalent, and are consistent with TEM-SAED analysis results, which proves that these two methods can effectively characterize the ORs of HCP-FCC phase transition and predict possible FCC phase variants.
Highlights
Pure titanium (Ti) is a rare metal and widely used in aerospace, automobile, MicroElectro-Mechanical System (MEMS) and other engineering fields
The face-centered cubic (FCC)-Ti is nucleated in the deformation cross-slip zone with the implementation of tensile deformation of pure titanium foil, which belongs to a stress-induced phase transformation
Bai et al [21] considered that in the rolling process of high purity titanium, apart from twinning [22,23,24] and dislocation mechanism [25], the hexagonal close packing (HCP)-FCC phase transition has an important contribution to its elongation process
Summary
Pure titanium (Ti) is a rare metal and widely used in aerospace, automobile, MicroElectro-Mechanical System (MEMS) and other engineering fields. Bai et al [21] considered that in the rolling process of high purity titanium, apart from twinning [22,23,24] and dislocation mechanism [25], the HCP-FCC phase transition has an important contribution to its elongation process. These show that the HCP-FCC phase transition can occur when pure titanium undergoes large plastic deformation at room temperature, which coordinates the deformation. When the phase transition between HCP and FCC obeys the specific OR, the parallel crystal directions and planes of the two phases can be accurately expressed by pole figures and phase transition matrix, and the variants meeting the OR can be predicted
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