The influence of scandium in effecting fragile to strong glass transition in aluminium-based alloys

Abstract

The “fragile”–“strong glass” transition in Al-based alloys is observed as a function of Sc content. The Sc-bearing alloys suffer glass transition as well as Sc-free Al0.84Y0.09Ni0.05Co0.02 alloy, however, the value of ΔCp decreases drastically and comes within the variation of the baseline at higher than 2 at. % of Sc. The studied glasses are free from pre-existing nuclei.

Crystallisation behaviours of Al-based metallic glasses: Compositional and topological aspects

“…The validity of the correlation between and crystallisation behaviour has been confirmed in multicomponent Al-based alloys of many other systems, such as Al-Y-RE-Ni-Co [14], Al-Y-Gd [15], Al-Y-Ni-Co-Sc [16], Al-Ni-La [17], Al-Y-Ni-Co-Pd [18] and others [19]. In all the systems evaluated, and considering the glass-forming composition range, increasing the values results in a clear transition from nanocrystallisation to glassy behaviour, usually with some degree of stabilisation of the supercooled liquid, indicated by an increase in the crystallisation temperature.…”

“…For example, large values of T x suggest stabilisation of the supercooled liquid against crystallisation with a high resistance to nucleation and growth of crystalline phases [10,11].…”

Crystallisation behaviour and glass-forming ability in Al–La–Ni system

“…The thermal behaviour for many multicomponent Al-based alloys [4][5][6][7][8][9] could be related with the parameter since is able to indicate alloy compositions which, upon continuous heating, exhibit a supercooled liquid region (here defined as glassy alloys, with > 0.1), nanocrystalline behaviour (defined as nanocrystalline alloys, with < 0.1) or an intermediate behaviour, where nanocrystallisation is preceded by a supercooled liquid region (defined as nano-glassy alloys, with ≈ 0.1).…”

Synthesis of ferromagnetic Fe-based bulk glassy alloys in the Fe–Si–B–P–C system

“…It is seen that although T g and T x decrease from 781 to 775 K and from 833 to 829 K, respectively, with an increase in C content, T x increases slightly from 52 to 54 K. It is also seen that the value of specific heat capacity ( C p ) in the glass transition region increases obviously with an increase of C content. It has been reported that the value of C p at the glass transition region indicates how much different the structure changes is at the glass transition [17,18]. Thus, it can be concluded that the thermal stability of the supercooled liquid increases with proper addition of C. Moreover, the crystallization of the Fe 76 B 10 Si 9 P 5 glassy alloy occurs through two-stage exothermic reactions.…”