|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Characterization of Surface Microstructure and Passive Film Formed on Nanostructured Ti-6Al-4V Alloy Produced by Cryogenic Burnishing
||Jun Tang, Hongyun Luo
|On-Site Speaker (Planned)
On the surface layer of Ti-6Al-4V alloy produced by cryogenic burnishing, reduced surface roughness, refined grain structure, and obviously improved corrosion resistance are achieved. The surface roughness (Ra=0.32 μm) of cryogenic burnished sample is much lower than that of dry burnished sample. Homogeneous and random nano-grains (less than 20nm) and high dislocation density (2×1017m-2) were obtained on the surface layer of burnished sample analysed by transmission electron microscopy (TEM). X-ray diffraction (XRD) results show that there is no development of texture after burnishing. The passive film of samples before and after burnishing in a 0.9 % NaCl solution was investigated by electrochemical and X-ray photoelectron spectroscopy (XPS) techniques from which it could be deduced that the passive film formed on burnished samples is more protective, less defective and 1.5 times thicker than that of the unburnished counterparts due to the high density of grain boundaries and dislocations.
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