Abstract
The microstructure evaluation and phase transformation of multi-pass friction stir-processed (FSP) commercially pure titanium were investigated using optical microscopy, scanning electron microscopy equipped with a backscatter detector, and electron backscatter diffractometer. The microstructure characterization shows that the grain refinement mechanism changed with the increasing number of passes. The equiaxed α grains in the untreated sample changed to lath-shaped grains surrounded by serrated grain boundaries, and produced Widmanstätten morphology during the cooling cycle of FSP. The higher micro-hardness values and bio-corrosion resistances of the FSP-treated samples are due to their lower grain size compared to the untreated samples. Furthermore, the presence of lath-shaped Widmanstätten morphology shows a higher micro-hardness value and lower bio-corrosion resistance.
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Vakili-Azghandi, M., Famil Hatami, M., Hoseini Sabzevari, S.A. et al. Microstructural Evolution and Bio-Corrosion Behavior of a CP-Ti Processed by Multi-Pass of Severe Plastic Deformation. JOM 74, 4621–4631 (2022). https://doi.org/10.1007/s11837-022-05415-9
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DOI: https://doi.org/10.1007/s11837-022-05415-9