Abstract
Abstract The effect of the progressive substitution of Zr by Hf on glass formation and thermal characterisation, using chill-block melt spinning and copper die suction casting, has been studied for the Zr 55− x Hf x Al 10 Ni 5 Cu 30 (0≤ x ≤55 at.%) and Zr 65− x Hf x Al 7.5 Ni 10 Cu 17.5 (0≤ x ≤65 at.%) alloy series. For both series, Hf induced a decrease in glass forming ability (GFA), with the formation of amorphous cast rods limited to low Hf content. For melt spun ribbon, the former series was fully amorphous at all Zr:Hf ratios while beyond x ≥45 crystalline phases in a glassy matrix were observed. For both series increased Hf concentration gave an increase in glass transition temperature ( T g ) and liquidus temperature ( T l ) and a decrease in magnitude of the supercooled liquid region (Δ T x ). The effect of Hf substitution on reduced glass transition temperature ( T rg = T g / T l ) was dependent on the series, the latter and former exhibiting an increase and decrease, respectively.
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