(哈尔滨工业大学 材料科学与工程学院， 哈尔滨 150001)
摘 要: 采用低纯度的原料， 通过电弧熔炼铜模铸造法制备了直径达10mm的Zr56.6Cu17.3Ni12.5Al9.6Ti4非晶合金圆棒。该合金玻璃转变温度tg＝385.8℃， 晶化温度tx＝464.2℃， 过冷液相区温差Δtx＝78.4℃， 约化玻璃温度trg(tg/tmL)＝0.62。 以基于DTA的合金凝固点偏移的方法确定该合金的临界冷却速度Rc=7.1℃/s， 低于商业合金Vit.105合金的临界冷速（约为10℃/s）。 楔形试样对比结果显示： Zr56.6合金试样中的非晶组织区域明显大于Vit.105合金的， 预示前者具有较好的实际玻璃形成能力。以上结果表明， Zr56.6Cu17.3Ni12.5Al9.6Ti4合金是Zr-Al-Ni-Cu-Ti系中玻璃形成能力最强的合金之一。
关键字: 块体非晶合金; 玻璃形成能力; 临界冷却速度; 约化玻璃温度
metallic glass
（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
