Nano-Structural Features, Raman Spectra and New Trend of 3D-AFM Investigations for High Performance Ni-Super-alloy

ABSTRACT
The synthesized Ni-alloy was prepared via conventional casting technique under vacuum and
highly superheated treatment route. The casting parameters such as solidification cooling rate (SCR)
was monitoring by both of AFM and SEM .Micro-structural investigations within different spots in the
same sample indicated that γ matrix is the domain phase besides minor phases as MC carbides, σ
phase and η phase which was observed to solidify in two forms as plate-like and blocky shape. The
volume fraction (Vf) of σ and η phases was increased as the solidification cooling rate decreases. 3Dmicrostructural imaging map of the Ni-based super-alloy was constructed depending upon AFM-data
evaluating that the morphology of the alloy-surface is a function of casting parameters .Furthermore
raman spectra of highly superheated casted Ni-based super-alloy was performed to confirm existence
of different phases recorded via SEM and EDX-elemental analysis with their corresponding different
vibrational modes such as Ni-O vibrating modes in the region 360-510 cm-1
and Mo-O vibrating mode
which lies at 1005 cm-1
.

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WSN 34 (2016) 34-50