Distribution Characteristics of In-Grain Misorientation Axes in Cold-Rolled Commercially Pure Titanium and Their Correlation with Active Slip Modes

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 41; no. 13; pp. 3473 - 3487
• Main Authors: Chun, Y. B., Battaini, M., Davies, C. H. J., Hwang, S. K.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.12.2010; Springer; Springer Nature B.V
• Subjects: Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cold; Deformation; Exact sciences and technology; Forming; Grain size; Materials Science; Metallic Materials; Metallurgy; Metals. Metallurgy; Nanotechnology; Production techniques; Rolling; Structural Materials; Surfaces and Interfaces; Thin Films; Titanium; Slip Mode; Discrete Pole Figure; IGMA Distribution; Cold Reduction; Misorientation Angle; Cold rolling; Titanium; Grain boundary misorientation; Forming; Cold rolled sheet; Slip
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-010-0410-4

The distribution characteristics of in-grain misorientation axes (IGMA) in cold-rolled pure titanium were investigated using electron backscatter diffraction (EBSD). Depending on the orientation of individual grains, two distinct IGMA distribution patterns were observed: one with strong intensities of IGMA around ⟨0001⟩ and the other with those around ⟨ uvt 0⟩. Analyses based on the Taylor axes and Schmid factors of possible slip modes suggested that the former pattern arises from predominant activation of prism ⟨ a ⟩ slip, while activation of slip under the suppression of prism ⟨ a ⟩ slip results in the latter pattern. It was also found that prism ⟨ a ⟩ slip becomes more active with increasing strain, playing a critical role in the plasticity of pure titanium. The present work demonstrates that IGMA analysis of EBSD data may be used to explore the active slip mode in polycrystalline hexagonal-close-packed (hcp) metals deformed to moderate to large strains.