A study of the microstructure of nanocrystalline Al–Ti alloys synthesized by ball milling in a hydrogen atmosphere and hot extrusion

Sonochemical doping of Ti-catalyzed sodium aluminum hydride

“…Faster discharge and charge kinetics have also been achieved through the use of graphite as a co-dopant with Ti, as first shown by Wang et al [20] and then by Dehouche et al [24]. One common factor that stands out among these more recent studies is that the reported enhancements simply augmented the results obtained by high energy ball milling, and thus depended on its use [5,[15][16][17][25][26][27][28][29][30][31].…”

“…These collisions create intense localized stresses and strains that induce structural changes and chemical reactions within the material, even at ambient temperature [32][33][34][35][36][37]. For example, structural changes associated with repeated fracturing and cold welding of a material has lead to highly metastable amorphous alloys and nanostructured intermetallic compounds [31,32,34,35,[38][39][40][41][42][43][44][45]. In addition, collision-induced chemical reactions has improved the hydrogenation properties of several hydrogen absorbing alloys [46] or even facilitated the low-temperature formation of novel hydrides with otherwise unstable alloy phases through reactive ball milling in a hydrogen atmosphere [47,48].…”

Study on solid-state reactions of nanocrystalline TiAl synthesized by mechanical alloying

“…In attempts to improve ductility, recent researches have focused on the production of ultrafine grained TiAl [1][2][3]. Mechanical alloying (MA) applied by several researchers to prepare nanostructured intermetallics [2,4]. MA is a non-equilibrium process to produce supersaturated solid solutions, metastable alloys and amorphous phase [5].…”

Effects of Heat Treatment on the Mechanical Properties of Al-4% Ti Alloy

“…The as-cast alloy morphology has some plate-like structure and evidence of formation of an intermetallic-like phase within the matrix of the alloy ( Figure 5). This plate-like structure has been identified as aluminium-titanium intermetallics with transmission electron microscope [7] while the precipitate-like phase represents TiB 2 [8]. Previous work has shown that TiB 2 reinforcement is both thermodynamically and microstructurally stable within the aluminide matrices [9].…”