(哈爾濱工業(yè)大學 材料科學與工程學院， 哈爾濱 150001)
摘 要: 采用低純度的原料， 通過電弧熔煉銅模鑄造法制備了直徑達10mm的Zr56.6Cu17.3Ni12.5Al9.6Ti4非晶合金圓棒。該合金玻璃轉變溫度tg＝385.8℃， 晶化溫度tx＝464.2℃， 過冷液相區(qū)溫差Δtx＝78.4℃， 約化玻璃溫度trg(tg/tmL)＝0.62。 以基于DTA的合金凝固點偏移的方法確定該合金的臨界冷卻速度Rc=7.1℃/s， 低于商業(yè)合金Vit.105合金的臨界冷速（約為10℃/s）。 楔形試樣對比結果顯示： Zr56.6合金試樣中的非晶組織區(qū)域明顯大于Vit.105合金的， 預示前者具有較好的實際玻璃形成能力。以上結果表明， Zr56.6Cu17.3Ni12.5Al9.6Ti4合金是Zr-Al-Ni-Cu-Ti系中玻璃形成能力最強的合金之一。
關鍵字: 塊體非晶合金; 玻璃形成能力; 臨界冷卻速度; 約化玻璃溫度
metallic glass
WANG Gang, CHEN De-min
（School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China）
Abstract: Bulk Zr56.6Cu17.3Ni12.5Al9.6Ti4 amorphous rod of 10mm in diameter was made by arc melt and copper mold cast method using lower purity materials. The glass transition temperature tg, crystallization temperature tx, and supercooled liquid region for this alloy are 385.8℃, 464.2℃ and 78.4℃, respectively. The reduced glass transition temperature trg=0.62. The critical cooling rate determined by DTA method is 7.1℃/s, lower than that of well known Vit.105 alloy. And the amorphous region in wedge-shaped samples of Zr56.6Cu17.3Ni12.5Al9.6Ti4 alloy is larger than that of Vit.105 formed under the same melting and casting conditions, suggesting that the former has better relative glass forming ability than the later. It is concluded that this new alloy is one of the best glass formers in quinary Zr-Ti-Ni-Cu-Al alloys.
Key words: bulk metallic glass; glass forming ability; critical cooling rate; reduced glass temperature
