Rolling-induced Face Centered Cubic Titanium in Hexagonal Close Packed Titanium at Room Temperature

Authors

• H. C. Wu, Beihang University, Beijing
• A. Kumar, Los Alamos National Laboratory
• J. Wang, University of Nebraska-LincolnFollow
• X. F. Bi, Beihang University, BeijingFollow
• C. N. Tomé, Los Alamos National Laboratory
• Z. Zhang, ZheJiang University, Hangzhou
• S. X. Mao, University of Pittsburgh, PittsburghFollow

Document Type

Article

Date of this Version

2016

Citation

Scientific Reports | 6:24370 | DOI: 10.1038/srep24370

Comments

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Combining transmission electron microscopes and density functional theory calculations, we report the nucleation and growth mechanisms of room temperature rolling induced face-centered cubic titanium (fcc-Ti) in polycrystalline hexagonal close packed titanium (hcp-Ti). Fcc-Ti and hcp-Ti take the orientation relation: 〈0001〉_hcp||〈001〉_fcc and {1010}_hcp||{110}_fcc, different from the conventional one. The nucleation of fcc-Ti is accomplished via pure-shuffle mechanism with a minimum stable thickness of three atomic layers, and the growth via shear-shuffle mechanisms through gliding two-layer disconnections or pureshuffle mechanisms through gliding four-layer disconnections. Such phase transformation offers an additional plastic deformation mode comparable to twinning.