SYNTHESIS AND MECHANICAL-PROPERTIES OF NANOSCALE MECHANICALLY-MILLED NIAL

This work reports on the synthesis, microstructural characterization a nd mechanical properties of nanocrystalline NiAl materials. Nanoscale crystallites of NiAl were formed by high energy milling of pre-alloyed powder, with and without Al2O3 particulate additions, under an Ar atm osphere. Consolidation of the powders was accomplished by die-forging and re-forging at < 0.5 T-m in air. Characterization of the powders an d consolidated microstructures and Vickers hardness data are reported. Analysis of the hardness data indicates that the majority of the stre ngthening is due to the refined microstructure.