Synthesis and Characterization of Nanocrystalline Iron Aluminide Intermetallic Compounds

Abstract

Refining grain size to the nanocrystalline level has been suggested as a way of improving strength while enhancing ductility and toughness. In the present study, nanocrystalline iron aluminide intermetallic compounds were synthesized using mechanical alloying, sintering and high velocity oxy-fuel (HVOF) thermal spraying from the elemental powders. The phase changes occurred during milling, thermal spraying and annealing studied from magnetic and structural points of view. XRD, SEM, DSC and dynamic ultra-microhardness tester were used for examining the microstructure, thermal stability, mechanical properties and wear behavior of the milled powders and coatings. The current results demonstrated that, by controlling the experimental conditions, it was possible to prepare iron aluminide intermetallic compound with nano-size grains.