Ultra-precision machining was carried out on a furnace cooled (FC) eutectoid Zn-Al alloy specimen using single point diamond turning (SPDT) technique. Microstructural changes and phase decomposition at the surface of the ultra-precision machined Zn-Al based alloy were investigated using X-ray diffractyion (XRD), scanning electron microscopy ( SEM ) and electron back-scattered diffraction ( EBSD ) techniques. Ultra-precision machining induced external stress resulted in decomposition of the ( phase and crystal orientation changes of the Zn-rich phases: η and ε, at the surface of the machined FC Zn-Al alloy specimen.
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