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.