摘要
利用铜模铸造法制备了Zr53Cu18.7Ni12Al16.3、Zr51.9Cu23.3Ni10.5Al14.3和Zr50.7Cu28Ni9Al12.3块体非晶合金,3种合金形成非晶的最大临界尺寸分别为6 mm、10 mm和14 mm。采用三点压弯式黏度仪、差热分析仪(DTA)研究了上述非晶合金过冷液体的黏度、脆性系数及临界冷却速度对玻璃形成能力的影响。结果表明:在3种合金中,Zr50.7Cu28Ni9Al12.3不仅具有最高的过冷液体黏度,而且具有最低的动力学脆性系数m(51.2)和临界冷却速率Rc(9.8 K/s),这导致该合金具有极强的玻璃形成能力。
Three bulk metallic glasses, Zr53Cu18.7Ni12Al16.3、Zr51.9Cu23.3Ni10.5Al14.3 and Zr50.7Cu28Ni9Al12.3 with a critical size of 6 mm, 10 m m and 14 mm, respectively, were fabricated by copper mold casting. The influence of viscosity of the supercooled liquids, fragility, and critical cooling rate on the glass forming ability of the amorphous alloys were investigated by three-point beam bending viscosity meter and differential thermal analysis （DTA） method. The results indicate that Zr50.7Cu28Ni9Al12.3alloy exhibits the highest viscosity of the supercooled liquids, the smallest values of the fragility parameter m （51.2） and the critical cooling rate Rc （9.8 K/s） , which all contribute to its high glass forming ability.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第4期17-21,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(11204200)
关键词
块体非晶合金
玻璃形成能力
脆性
临界冷却速度
bulk metallic glasses
glass forming ability
fragility
critical cooling rate
