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

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.