An EBSD investigation of ultrafine-grain titanium for biomedical applications

作者：Dyakonov G S; Zemtsova E; Mironov S^*; Semenova I P; Valiev R Z; Semiatin S L

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2015, 648: 305-310.

DOI：10.1016/j.msea.2015.09.080

• EBSD
• Titanium alloys
• Nanostructured materials
• Equal channel angular processing
• Grain refinement

High-resolution electron backscatter diffraction (EBSD) was used to examine the grain structure in long rods of ultrafine-grain (UFG) commercial-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 similar to 0.3 mu m, and the fraction of high-angle boundaries was similar to 45%. The material had a strong <10<(1)over bar>0>-fiber texture. An analysis of the microstructure-properties relationship showed that the increase in material strength developed during severe plastic deformation resulted from grain refinement and substructure evolution in comparable measure.

• 出版日期2015-11-11