SYNTHESIS OF NICKEL BASED SUPERALLOY FOR HIGH TEMPERATURE APPLICATIONS

The present study was taken up to synthesize Ni based superalloy with yttria dispersion strengthened alloys by MA. Oxides can make best dispersoids because of its high hardness, stability at high temperatures, inertness, or insolubility in the matrix. These oxide particles were incorporated into the metal by planetary ball mill. The volume fraction of the dispersoid added was 0.6 wt%. Synthesis of nanocrystalline yttria used as dispersoid was prepared by Sol-gel method. MA makes possible the combination of dispersion, solid solution and precipitation strengthening by mixing all the constituents in the powder more intimately and to form a true alloy powder with oxides dispersed in the solid solution. Characterization of ODS alloy powders was taken up after experimental synthesis. XRD analysis was carried out. SEM Analysis of the ODS alloy powders were recorded to evaluate the micro structural evolution during MA.