以结晶Zr棒及海绵Zr为原材料、利用浇包型坩埚电弧炉倾斜铸造法制备了不同氧杂质含量的Zr52.5Cu17.9Ni14.6Al10Ti5块体非晶合金楔形试样, 研究了氧对合金玻璃形成能力及热稳定性的影响.结果表明: 氧杂质虽然降低合金以最大非晶形成厚度tmax为表征的玻璃形成能力, 却提高合金以过冷液相区温度范围Tx1为表征的热稳定性. 氧杂质具有提高合金开始晶化表观激活能E ax1的趋势.
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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