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

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 , 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 pure-shuffle mechanisms through gliding four-layer disconnections. Such phase transformation offers an additional plastic deformation mode comparable to twinning.

SUBMITTER: Wu HC 

PROVIDER: S-EPMC4828854 | biostudies-other | 2016 Apr

REPOSITORIES: biostudies-other