过热处理时间对Zr-Cu基大块非晶合金力学性能的影响

Effect of Overheating Treatment Time on Mechanical Properties of Zr-Cu-Based Bulk Metallic Glasses

摘要:

在一定初始温度下经过不同时间的熔体过热处理，利用铜模吸铸法，制备纯非晶合金Zr48Cu36Ag8Al8棒状试样，通过X射线衍射仪（XRD）、差示扫描热分析仪（DSC）、万能力学试验机和场发射扫描电子显微镜（SEM）研究过热处理对其力学性能的影响。结果表明，在一定的处理时间范围内，随着处理时间的增长，Zr48Cu36Ag8Al8非晶合金原子排列的混乱度增加，非晶合金的平均自由体积增加，Zr48Cu36Ag8Al8非晶合金的变形局域化程度降低，变形能力随之增强，非晶合金的断裂强度和塑性得到了提高

Abstract:

Zr48Cu36Ag8Al8 bulk metallic glasses with 3 mm diameter were prepared with suction-casting into a water-cooling-copper mold for different casting treatment time from the same overheating temperature. The effect of treatment time in metallic liquid on the mechanical properties of Zr-Cu-based bulk metallic glasses were studied by X-ray diffractometer (XRD), differential scanning calorimeter (DSC), compression tests and scanning electron microscope (SEM). The results show that in a certain range of treatment time, longer treatment time of overheating treatment time would increase the density of the free volume and the deformation ability, thus decreasing the local deformation degree and increasing the fracture strength as well as the plasticity of the Zr48Cu36Ag8Al8 bulk metallic glasses