In the present study mechanical properties and thermal stability was studied on three different composition Fe-42Ni-2Y2O3-2Zr, Fe-42Ni-2Y2O3-2Ti and Fe-42Ni-2Y2O3-2Ti-2Al respectively. All the three compositions were prepared using mechanical alloying via high energy ball mill and consolidated through spark plasma sintering at 1100 °C, with an applied load of 60 MPa. All the sintered sample were mirror polished using colloidal silica EBSD (Electron Backscatter Diffraction) scan was conducted to understand the microstructural features along with micro-strain using KAM (Karnel Average Misorientation) and texture formation. Microstructure features were correlated with mechanical properties using Vickers hardness. XRD was conducted to understand the phase formation. Diffusional annealing was conducted on sintered sample at a temperature of 1200 °C under argon atmosphere to understand the grain growth mechanism and thermal stability. Annealed sample were compared with sintered sample on the basis of mechanical properties and micrographic feature and phase formation. Orowan strengthening and Zenner pinning played vital role in high temperature thermal stability and grain refining.
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