Surface nanodeformation of discontinuously reinforced Ti composite by in situ atomic force microscope observation

Abstract

The surface nanodeformation of a discontinuously reinforced Ti-6Al-4V composite during tensile loading was investigated by in situ atomic force microscope (AFM) observation. The material used was a TiB whisker and TiC particle reinforced Ti-6Al-4V composite. The evolution of surface roughness and slip band spacing was quantified as a function of applied strain. The microstructural damage during tensile loading was also studied. The formation of slip bands within a grain of the Ti-6Al-4V matrix was clearly observed when the applied strain above was 1.3%. The amount of slip bands and surface roughness increase with increasing applied strain. The rupture of TiC particle and multiple cracking of TiB whiskers were also observed at the applied strain above 1.3%. The interaction of slip bands with the reinforcements and mechanisms of deformation and fracture of the composite were elucidated.

Development of a pattern to measure multiscale deformation and strain distribution viain situFE-SEM observations

“…In these measurement methods, the deformation and strain localization of materials during loading can be measured using several experimental techniques at various length scales, such as the widely used strain gage technique and various full-field non-contact optical methods including interferometric methods at the macroscale [8], the scanning electron microscope (SEM) grating method [9][10][11] and electron backscatter diffraction method [12] at the micron scale, transmission electron microscopy (TEM) methods [13,14] and atomic force microscopy [15,16] at the nanoscale, and the digital image correlation (DIC) method [17]. However, these experimental investigations have been conducted within a specific length scale because of the difficulty in obtaining multiscale measurements using one specimen.…”