过热时间对Cu36Zr48Al8Ag8组织和力学性能的影响

摘要

The mother alloy is produced by using of electromagnetic levitation melting process of water-cooled copper crucible and three samples of amorphous with over heat time of 2 , 4 and 6min are prepared by copper mold suction casting method in vacuum under the conditions of voltage 6. 5kV , respectively. The microslructure and mechanical properties of Cu36 Zr48 Al8 Ag8 glass are investigated by DSC, XRD, SEM , universal testing machine and Vickers microhardneas meter. The results show that with the holding time prolonging, the alloy exhibits a crystallization lend and the thermal stability is dereased. The atomic arrangements are transformed from dense to sparse , as well as the atomic free volume among the atoms is increased, that is the density and the microhardecess of the amorphous alloy are dreased.%用电磁悬浮熔炼工艺在水冷铜坩埚中制备母合金,用铜模吸铸法在6.5kV电压真空条件下,分别保温2,4,6min制备出3个非晶试样,用差热分析仪( DSC)、X射线衍射仪(XRD)、扫描电镜(SEM)、万能试验机、显微硬度计,研究过热时间对Cu36 Zr48 Al8Ag8块体金属玻璃组织和力学性能的影响.结果表明,在非晶组元和形成非晶时的冷却速率相同的条件下,随着保温时间的延长,液态合金有结晶的趋向,合金的热稳定性降低,原子的排列也由致密向稀疏转变,原子之间的自由体积增大,其紧密化程度低,硬度降低.