三种ZrAlNiCu大块金属玻璃的力学性能

Mechanical Properties of Three Types of ZrAlNiCu Metallic Glasses

摘要:

采用真空氩弧熔炼加铜模吸铸的方法成功制备了3种ZrAlNiCu全非晶材料。通过Instron-3369力学性能试验机测试了3种金属玻璃的压缩力学性能，并采用FEI Nano230型场发射扫描电镜（SEM）研究了压缩断口特征。研究表明，增加Ni含量和降低Cu含量将降低ZrAlNiCu金属玻璃的断裂强度和弹性模量，并使得ZrAlNiCu金属玻璃的断口由扩展良好的“脉络状”花纹转变为完全脆性特征。Ni含量的增加以及Cu含量的降低减少了ZrAlNiCu金属玻璃中自由体积的密度，降低了合金的变形能力，增加了合金的变形局域化程度，从而降低了ZrAlNiCu金属玻璃的断裂强度、塑性和弹性模量。

Abstract:

Three types of ZrAlNiCu metallic glasses were successfully fabricated through vacuum arc melting under an argon atmosphere with suction-casting into a water-cooling-copper mold. The compressive mechanical properties of the three metallic glasses were tested using an Instron-3369 mechanical testing machine, and the compressive fracture surface was investigated by FEI Nano230 scanning electron microscope (SEM). Results show that increasing the Ni content and decreasing the Cu content will decrease the fracture strength and elastic modulus of the metallic glasses, and change the “vein-type” fracture surface to a completely brittle characteristic. The increase in the Ni content and decrease in the Cu content decrease the density of the free volume, degrade the deformation ability, increase the local deformation degree, and thus, decrease the fracture strength, plasticity and elastic modulus of the ZrAlNiCu metallic glass.