In situ TEM observation of HCP to FCC transitions in hexagonal close-packed titanium
Yuan Ma, Yongqing Chen, Xinyang Yu, Binglu Zhang, Lu‐Ning Wang, Yang He
Abstract
It remains controversial as to whether a face-centered cubic (FCC) phase exists in pure titanium (Ti) upon deformation, since the FCC structures in deformed Ti may well be TiHx resulting from the sample preparation process. Here, by using in situ transmission electron microscopy (TEM), we uncover direct evidences on the nucleation and growth of FCC-Ti right in front of the crack tip in the α-Ti matrix. Atomic resolution images further reveal that the transformation can be mediated by either partial dislocations on basal planes or shear and atomic shuffle on the FCC1 1 0|HCP1 0 -1 0 interfaces.
Topics & Concepts
Materials scienceIn situTitaniumHexagonal crystal systemClose-packing of equal spheresCrystallographyMetallurgyMeteorologyChemistryPhysicsTitanium Alloys Microstructure and PropertiesMetal and Thin Film MechanicsMicrostructure and mechanical properties