Calculation of glass forming ranges in Al–Ni–RE (Ce, La, Y) ternary alloys and their sub-binaries based on Miedema's model

Calculation of glass forming ranges in the ternary Y–Cu–Al system and its sub-binaries based on geometric and Miedema's models

“…The creation of amorphous phase is preferred between 8 and 89 at.% of Y in AleY and between 6 and 93 at.% of Y in YeCu binary alloys. The results for AleY are close to those obtained by Sun et al [13] with the use of Toop's model, where 20e79 at.% Y glass forming range was predicted. Results for other lanthanides (La, Ce) are almost identical and it is believed that they play similar roles in the binary systems analyzed.…”

“…Additionally, with the substitution of Y by Ce, the GFA does not vary noticeably and amorphous ribbons were also formed for the other compositions of the Y x Ce 50Àx Cu 42 Al 8 (0 x 50) system. A similar effect was reported for Y-, La-and Ce-based alloys [13].…”

“…Nevertheless, it does not include the effect of an additive element on the properties of a binary alloy. Some other authors [13] have proposed asymmetric methods (for example, those based on Toop's model [19]) which include the effect mentioned hereinbefore, but such methods generate yet other possible inaccuracies due to the individual experience-based choice of the asymmetric constituent. Therefore, the asymmetric geometric model, which is independent on the choice of the asymmetric element (proposed by Ouyang et al [20] for ternary intermetallics and solid solutions), is used in this paper in a new manner, for the predictions of GFA.…”

Thermodynamics and the Glass Forming Ability of Alloys

“…Miedema's approach has been extensively used by Nagarajan and Ranganathan (Nagarajan & Ranganathan, 1994), Inoue, 2001 &2004) and other researchers (Murty, et al, 1992;Rao, et al;Basu, et al, 2008;Sun, et al, 2010) to determine the glass forming composition range (GFR) in a number of ternary and multicomponent systems. In the work performed by Takeuchi and Inoue , the amorphous-forming composition range (GFR) was calculated for 338 ternary amorphous alloy systems on the basis of the database given by Miedema's model in order to examine the applicability of the model, to analyze the stability of the amorphous phase, and to determine the dominant factors influencing the ability to form an amorphous phase.…”

Enthalpy of Mixing in Al–Tb Liquid

“…For example, the marginal glass-forming ability in the Al-RE (aluminum rare-earth) systems has been associated with ordering in the liquid phase [18][19][20][21][22][23][24][25][26][27][28][29]. In addition, due to their relative simplicity compared to conventional many-component glass-forming alloys, Al-RE and Al-RE-TM (TM denotes transition metal) alloys are excellent model systems for the investigation of phase stability [30][31][32][33], metallic glass formation [34][35][36][37], liquid properties and crystallization [38][39][40], and glassy alloy structure/properties [25,41,42]. As with all glass-forming liquids, however, properties may become increasingly temperature dependent near and below the liquidus [43][44][45], highlighting the need for reliable thermodynamic descriptions of the liquid state.…”