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

Abstract

In this study, the role of Be in glass forming ability (GFA) and thermal stability of (Al 85Ni 7Y 8) 100− x Be x ( 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 (Δ T x = T x − T g, where T x and T g are the onset crystallization and the glass transition temperatures, respectively), reduced glass transition temperature ( T rg = T g/ T L, where T L is the liquidus temperature), K (=( T x − T g)/( T L − T x)), γ (= T x/( T g + T L)) and the activation energy for primary crystallization ( E a), became slightly increased by the addition of 2% Be. The higher GFA representing parameters and thermal stability for the (Al 85Ni 7Y 8) 98Be 2 alloy, however, did not result in a practically enhanced glass formability.