含Nb的Cu-Zr-Al基大块金属玻璃的玻璃形成能力和力学性能

摘要

研究了由真空吸铸法制备的直径为2.5 mm的(Cu50Zr43Al7)100−xNbx (x=0,1,3,6,9)大块金属玻璃棒的力学性能。在温室条件下进行的单轴压缩试验结果表明，当x=3时样品具有最佳的力学性能(塑性应变和断裂强度分别为2.8%和1.98 GPa)。采用扫描电镜(SEM)和X射线衍射(XRD)方法观察样品的微观结构、断裂面和剪切带。%Mechanical properties of (Cu50Zr43Al7)100−xNbx (x=0,1,3,6,9) bulk metallic glasses rods with a diameter of 2.5 mm prepared by suction casting method were studied. The results of uniaxial compression tests at room temperture show that the best mechanical properties of 2.8% and 1.98 GPa for plastic strain and fracture strength, respectively, in the sample with x=3. Microstructure, fracture surface and shear bands of the samples were observed by SEM and XRD methods.