Role of different factors in the glass-forming ability of binary alloys

Abstract

International audienceIn the present work, we discuss the glass-forming ability of various binary alloys in which the glassy phase was not formed even by melt spinning technique with high cooling rate of the melt up to 1 MK/s (some consisted of partly glassy phase), though by commonly accepted guidelines, these alloys could be as good glass-formers as many other binary glasses. The alloys studied belong to binary systems with multiple eutectics; the constituent elements have a negative enthalpy of mixing, and a significant variability of atomic size differences is observed from system to system. The results indicate the necessity of taking into account simultaneously various factors influencing the glass-forming ability including melt fragility

Room‐temperature dynamic quasi‐elastic mechanical behavior of a Zr–Cu–Fe–Al bulk metallic glass

“…This leads to the conclusion that with the progression of plastic deformation the samples storage modulus should decrease. However, the accumulation of atomic local stresses [48,49] in the non-deformed glassy matrix by not well developed shear bands led to the increase in the overall sample hardness [50] due to the intensification of the stresses in the plastically undistorted matrix similar to the results of the present study. Therefore, one can see that the elastic cyclic loading leads to the increase of the storage modulus, and in the case of plastic flow the effect can be even more pronounced.…”

“…In general, BMGs exhibit promising combination of mechanical , magnetic , and other properties . Following binary and ternary BMGs , the additional alloying further improves their glass‐forming ability (GFA) and thus quaternary Pd‐ and Zr‐based BMGs exhibit exceptionally high glass‐forming ability . BMG alloys exhibit high strength, hardness, wear resistance, and large elastic deformation .…”

Revealing Structural Changes at Glass Transition via Radial Distribution Functions

“…In this approach the classical Gibbs free energy change for a crystal formation has been modified to account for the enthalpy saving which allowed decent description of liquid-liquid and stable glass transitions 20,21 . Direct structural changes upon glass transition have been revealed by in-situ studies of glass transition by synchrotron XRD via reciprocal and realspace radial distribution functions [22][23][24] .…”

An atomistic study of the structural changes in a Zr–Cu–Ni–Al glass-forming liquid on vitrification monitored in-situ by X-ray diffraction and molecular dynamics simulation

“…Fragility is also related to the glass-forming ability of BMGs [31,32] (with some argumentation [33]) 3 partly because stronger liquids, in general, have a higher viscosity in the entire temperature range from Tl and Tg. There are also experimental results which indicate correlation between liquid fragility and vibrational properties of the glass below Tg [34].…”