Abstract Crystal zirconium bar and sponge zirconium were employed as raw materials to prepare wedge-like specimens of Zr52.5Cu17.9Ni14.6Al10Ti5 bulk amorphous alloy with different oxygen impurity contents by a tilt casting method using ladle hearth type arc furnace. Oxygen impurity effect on the alloy’s glass forming ability and thermal stability was investigated. It is shown that the glass forming ability of the quinary alloy characterized by maximum amorphous sample forming thickness tmax decreased as oxygen impurity content increased, on the contrary, its thermal stability characterized by supercooled liquid region ΔTX enhanced. The reason that oxygen impurity made Zr52.5Cu17.9Ni14.6Al10Ti5 alloy’s thermal stability increased related to its higher reduced glass transition temperature Trg.
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