(西安交通大學(xué) 金屬材料強(qiáng)度國(guó)家重點(diǎn)實(shí)驗(yàn)室，西安 710049)
摘 要: 以海綿鋯為原材料， 利用澆包型坩堝電弧爐傾斜鑄造法制備Zr52.5Cu17.9Ni14.6Al10Ti5五元塊體非晶合金楔形試樣， 研究活性元素Sc對(duì)合金玻璃形成能力及晶化動(dòng)力學(xué)參數(shù)的影響。 結(jié)果表明： Sc的加入可顯著增大合金的最大非晶形成厚度， 但對(duì)合金過冷液相區(qū)溫度范圍所表征的熱穩(wěn)定性影響較小。 Sc雖然使合金的晶化激活能降低， 但使晶化孕育期時(shí)間常數(shù)增大， 晶化頻率因子減小， 二者的綜合作用使合金晶化孕育期延長(zhǎng)， 過冷傾向增大， 玻璃形成能力提高。
關(guān)鍵字: 鋯基塊體非晶合金； 玻璃形成能力； 熱穩(wěn)定性； 晶化動(dòng)力學(xué)； 激活能； 孕育期
（State Key Laboratory for Mechanical Behavior of Materials,
Xi'an Jiaotong University, Xi'an 710049, China）
Abstract: Sponge zirconium was employed as raw material to prepare wedge-like specimens of Zr52.5Cu17.9Ni14.6Al10Ti5 quinary alloy by a tilt casting method using ladle-hearth-type arc furnace. The effect of active element Sc on the glass forming ability and crystallization kinetic parameters of the quinary alloy is investigated. It is shown that the maximum amorphous forming thickness of the alloy was increased greatly because of the addition of Sc, however, the thermal stability characterized by supercooled liquid region is hardly affected. Although the apparent activation energy for crystallization process is decreased after Sc addition, the incubation period constant is enlarged and the frequency factor is reduced. The synthetical influence of these two aspects makes the incubation period prolonged, supercooled tendency increased and therefore glass forming ability improved.
Key words: Zr-based bulk amorphous alloy; glass forming ability; thermal stability; crystallization kinetics; activation energy; incubation period
