Zr基大块非晶合金的动态力学性能

Dynamic Mechanical Analysis of Zr-Base Bulk Metallic Glass

采用熔体喷铸的方法制备了板状非晶合金Zr55Al10Ni5Cu30,研究了Zr55Al10Ni5Cu30的动态力学性能.实验结果表明:在玻璃转变温度以下,大量原子仍处于"冻结"状态,原子运动微弱,内耗较小;在过冷液相区合金由非晶态向粘流态转变,原子解冻为自由原子的过程中,需要克服较大的摩擦力,模量变化急剧,内耗较大,并在玻璃转变温度下这种损耗将达到极大值;由于非晶合金Zr55Al10Ni5Cu30本身的粘弹性成分较大,由储能模量、损耗因子确定的玻璃转变温度相差将近50℃.

Plates of Zr-base bulk metallic glass were prepared by melt spurt casting method, and the dynamic mechanical property of the Zr55Al10Ni5Cu30 was investigated. Below the glass transition temperature, a large quantity of atoms are at the stage of ＂frozen＂, and their internal friction is weak. In the supercooled liquid state, as the atom becomes free, the alloy changes into viscous flow. During the transition process, internal friction increases and the storage modulus drops sharply. At the glass transition temperature, the modulus reaches the peak. As the viscous component tendency of the Zr55Al10Ni5Cu30 itself is relatively larger, the glass transition temperature determined by storage modulus and loss factor are apparently not identical with about 50℃ difference.