Synthesis and formation mechanism of nanostructured NbAl3 intermetallic during mechanical alloying and a kinetic study on its formation

Facile synthesis of Nb–Al alloy powders via sodiothermic reduction in molten salts

“…This is because that, after 10 min of milling times, large Nb 2 O 5 and Al 2 O 3 aggregates are reduced by sodium forming metal Nb and Al, respectively. Also, there is an agreement with the previous report that NbAl 3 can be synthetized from Nb powders and Al liquid drops easily [20,21]. After 1 h and 3 h of milling times, as presented in Fig.…”

“…However, the high vapor pressure of chlorides makes the difficulty in operation during the reactions. Besides, mechanical ballmilling is a useful method for raw material blending involves reducing the particle size and making the composite powders more homogeneous [20][21][22][23][24]. Therefore, it is important to find a facile approach for the direct synthesis of Nb-Al intermetallic compounds conducted in the molten system using the homogeneous oxides from mechanical ball-milling.…”

Studies on the formation of aluminides in heated Nb–Al powder mixtures

“…Model-free isoconversion methods rely on approximating the temperature integral on the right hand side to determine the activation energy. It has been shown that these methods can provide consistent and reliable kinetic information for different processes [25][26][27][28][29][30][31][32][33][34]. The activation energy was calculated using the Starink expression [29,30] given below.…”

Mössbauer and magnetization studies of mechanically milled nanocrystalline Fe1–xAlx alloys

“…Amils et al [11] showed in several works that fine grain size iron aluminides exhibit excellent strength and ductility. It can be inferred that decreasing the grain size to the nanometre level should result in a further increase in the strength of the material as defined by the Hall-Petch effect and previously observed for several metallic and intermetallic systems: Cu [12], Fe [13], NiAl [14], and NbAl 3 [15]. Because of this, the nanostructured FeAl alloys are a matter of great interest in recent years.…”