Electron backscatter diffraction-analysis of deformed micro-milled commercially pure-titanium specimens at different strain values
Journal article, 2017
The surface structuring process micro-milling introduces
small grooves, which act as geometrical notches and influence
the mechanical properties of the component, into the
surface. The mechanical behaviour depends on the relation
of the notch size to the grain size. Micro-milling processes
were applied to improve the functional properties of component
surfaces. They are used in mechanically loaded environments
as well as in biotechnological applications.
Therefore, commercially-pure-titanium is a favoured material
of investigation. To determine the effect of the notches,
a detailed analysis of the deformation behaviour of the
structured material is indispensable. In the present work,
structured specimens were tested under quasi-static loading.
The testing was interrupted at different strain values.
The micro-sections of the specimens were characterized
by means of electron backscatter diffraction analysis to obtain
information about the first indication of plastic deformation
and the development of the deformation features.
The results show inhomogeneous deformation behaviour
of the material. The deformation mechanisms, the development
of small angle and high angle grain boundaries as well
as twinning are shown.