新型Pr基大块非晶及其特性研究  

A new Pr-based bulk metallic glass and its properties

作　　者：赵作峰[1] 张志[2] 李正[1] 闻平[2] 赵德乾[2] 潘明祥[2] 王万录[1] 汪卫华[2] 

机构地区：[1]重庆大学数理学院,重庆400044 [2]中国科学院物理研究所,北京100080

出　　处：《物理学报》2004年第3期850-853,共4页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :5 0 0 3 10 10和 10 1740 88);北京市科学技术委员会基金 (批准号 :H0 2 0 40 0 3 0 3 2 0 )资助的课题~~

摘　　要：用铜模吸铸法获得了直径为 5mm的一种新的Pr基大块非晶 .与以往其他稀土 过渡金属 (RE TM)大块非晶不同的是 ,这种新的Pr基大块非晶具有明显的玻璃转变和稳定的过冷液相区 ,且其玻璃转变温度在目前已知的大块非晶中是最低的 ,Tg=4 0 9K .研究了该大块非晶的玻璃转变动力学 ,并给出了Kauzmann温度Tk、Vogel Fulcher温度T0gA new rare-earth Pr-based bulk metallic glass (BMG) is obtained in the shape of rod up to 5 mm in diameter by die cast. Unlike other rare-earth based BMGs, it exhibits a distinct glass transition, T g=409K,the lowest glass transition temperature among the known BMGs, a large and stable supercooled liquid region and paramagnetic property. The glass transition as well as its kinetic nature and the fragility parameters m of the BMG have been studied. The BMG offers an ideal model to investigate the nature of glass transition as well as the relaxation and nucleation with a large experimentally accessible time and temperature window at very low temperature region.

关 键 词：镨基 大块非晶 玻璃转变 脆性参数 铜模吸铸法 Kauzmann温度 Vogel-Fulcher温度 

分 类 号：TG139.8[一般工业技术—材料科学与工程]