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。
Bulk Zr_(56.6)Cu_(17.3)Ni_(12.5)Al_(9.6)Ti_4 amorphous rod of 10 mm in diameter was made by arc melt and copper mold cast method using lower purity materials. The glass transition temperature t_g, crystallization temperature t_x, and supercooled liquid region for this alloy are 385.8 ℃, 464.2 ℃ and 78.4 ℃, respectively. The reduced glass transition temperature t_(rg)=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 Zr_(56.6)Cu_(17.3)Ni_(12.5)Al_(9.6)Ti_4 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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2004年第2期168-172,共5页
The Chinese Journal of Nonferrous Metals
基金
西北工业大学凝固技术国家重点实验室访问学者基金资助
