Sample preparation
Two pieces of wires that had broken during drawing were collected. The samples were cleaned with acetone to remove
dirt and other adherent debris for visual examination prior to Fractography and metallographic sample preparation.
Transverse and longitudinal specimens were prepared from the fractured end of each failed wire samples for conducting
light microscopic examination. These samples were individually mounted in electrically conductive copper-containing resin
and polished by conventional metallographic techniques. The failed surfaces were examined under upright metallurgical
microscope as un-etched and etched conditions. Etching was done using 3% Nital with care.