Glass formability and thermal stability of Al-Ni-Y-Be amorphous alloys

In this study, the role of Be in glass forming ability (GFA) and thermal stability of (Al85Ni7Y8)100−xBex (x = 0-6 at.%) amorphous alloys has been investigated in an attempt to understand small atomic size effect in Al-TM-RE (TM: transition metal, RE: rare earth metal) alloy system. The supercooled liquid region (ΔTx = Tx − Tg, where Tx and Tg are the onset crystallization and the glass transition temperatures, respectively), reduced glass transition temperature (Trg = Tg/TL, where TL is the liquidus temperature), K (=(Tx − Tg)/(TL − Tx)), γ (=Tx/(Tg + TL)) and the activation energy for primary crystallization (Ea), became slightly increased by the addition of 2% Be. The higher GFA representing parameters and thermal stability for the (Al85Ni7Y8)98Be2 alloy, however, did not result in a practically enhanced glass formability.