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An EBSD Investigation of Ultrafine-Grain Titanium for Biomedical Applications
Ufa State Aviation Technical University Ufa Russia
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High-resolution electron backscatter diffraction EBSD was used to examine the grain structure in long rods of ultrafine-grain UFGcommercial-purity titanium produced for medical implants. The UFG material was obtained by equal channel angular pressing ECAP using a Conform scheme followed by rod drawing. The microstructure was found to be bimodal consisting of relatively coarse elongated grains containing well-developed substructure and ultrafine grains. The mean grain size was 0.3 m, and the fraction of high-angle boundaries was 45 . The material had a strong 101 0-fiber texture. An analysis of the microstructureproperties relationship showed that the increase in material strength developed during severe plastic deformation resulted from grain refinement and substructure evolution in comparable measure.
APPROVED FOR PUBLIC RELEASE