Annealing Effects on Viscosity of Zr55Cu30Al10Ni5 Supercooled Liquids
Annealing Effects on Viscosity of Zr55Cu30Al10Ni5 Supercooled Liquids
复制标题
退火对Zr55Cu30Al10Ni5过冷液体粘度的影响
DOI：
10.2320/matertrans.mj200792
复制
发表时间：
2007
影响因子：
1.2
通讯作者：
A. Inoue
中科院分区：
文献类型：
--
作者：
T. Yamasaki;S. Maeda;T. Fukami;Y. Yokoyama;H. Kimura;A. Inoue
用穿透粘度计研究了在20、200和400°C/min的升温速率下，铸态和退火态的非晶合金过冷液相区的粘性流动行为。直径为1 mm的圆柱形压头的外加载荷在0.049~0.294 N之间变化，在不同的加热条件下，粘度与这些外加载荷完全无关。当样品以20°C/分钟的速度缓慢加热时，粘度表现出相对较高的值，这可能主要是由于氧化物对样品表面的趋肤作用。升温速率在2 0 0℃/m in及以上时，粘度(η)大幅度下降并趋于饱和。大块非晶玻璃在400℃下退火后，密度增加，而晶化温度(Tx)、粘度和粘性流动激活能随退火时间的延长而逐渐降低。粘度的特殊行为可以通过在松弛过程中的退火过程中形成颗粒来解释。
Viscous flow behavior in supercooled liquid region of as-cast and annealed Zr 55 Cu 30 Al 10 Ni 5 bulk metallic glasses has been examined by using a penetration viscometer under various heating rates of 20, 200 and 400°C/min. Applied load for the cylindrical-shaped penetration indenter with a diameter of 1 mm was varied from 0.049 N to 0.294 N. Viscosity was quite independent of these applied loads under the various heating conditions. When the sample was slowly heated at the rate of 20°C/min, viscosity exhibited relatively high values that may be mainly due to the skin effects of oxides on the sample surface. At the heating rate of 200°C/min and above, viscosity (η) largely decreased and tended to saturate. By annealing the bulk metallic glasses at 400°C, the density of the glasses increased, while the crystallization temperature (T x ), the viscosity and the activation energy for viscous flow in their soopercooled liquid decreased gradually with increasing the annealing time. The specific behaviour of viscosity has been explained by the formation of particles during annealing for relaxation.