Fig. 1
From: Investigation on micro drilling of low carbon NiTi alloy using tungsten carbide micro drill tool

Optical microscopic image of the low carbon NiTi alloy under different magnification showing spheroidal carbon granules.
From: Investigation on micro drilling of low carbon NiTi alloy using tungsten carbide micro drill tool

Optical microscopic image of the low carbon NiTi alloy under different magnification showing spheroidal carbon granules.