Structure and composition heterogeneity of a FeAl alloy prepared by one-step synthesis and consolidation processing and their influence on grain size characterization

Hallmarks of mechanochemistry: from nanoparticles to technology

“…761 This has been achieved in this regard by using the methods of mechanically activated field-activated pressure-assisted synthesis (MAFAPAS), which has been patented, 762 and mechanically activated spark plasma sintering (MASPS). Both methods, which consist of the combination of mechanical activation step followed by consolidation step under the simultaneous influence of electric field and mechanical pressure, have led to the formation of dense nanostructured ceramics, intermetallics and composites, such as MoSi 2 , 763,764 FeAl, [765][766][767][768][769][770][771][772] and NbAl 3 . 773,774 …”

Microstructure evolution and mechanical properties of nanocrystalline FeAl obtained by mechanical alloying and cold consolidation

“…Recent studies have demonstrated the feasibility of fabricating FeAl intermetallics by powder metallurgy, including hot isostatic pressing (HIP) [5], extruding [6,7], hot forging or pressing [8,9], powder injection molding [10] and cold consolidation [11][12][13][14]. The FeAl powders used for powder metallurgy processes were prepared mostly by MA [5,9,11,14]. The formation of nanocrystalline structures is possible in the ball-milled FeAl powders, thus helping improve the ductility [6].…”

Combustion of heterogeneous nanostructural systems (Review)

“…By adding KNO 3 (20 wt.%) to the Fe-Si system, stable combustion was provided and iron silicides with a fine-grain microstructure were obtained [64]. Combustion of the 4B + C [65], Fe + Al [66], and 2Mg + Ni [67] compositions was additionally activated by passing electric current through the sample subjected to preliminary mechanical activation. The activating effect of electric current is not restricted to the Joule heating of the entire sample; most probably, constant or pulsed current generates spark and arc microdischarges at places of contact of the reactive mixture particles.…”

“…This phenomenon formed the basis of the method of plasmaspark activation combined with mechanical activation, which was used, in particular, to obtain the TiC-TiB 2 cermet [68] and dense nanocrystalline MoSi 2 [69] in the burning regime. In some publications, these methods of activation are additionally combined with a mechanical action on condensed combustion products of hot pressing [66][67][68] or extrusion [70].…”