ZrCuNiAlEr块体金属玻璃尺度效应的研究

摘要

通过磁悬浮熔炼-铜模吸铸法制备了直径为2,4,6 mm的(Zr63.36/100Cu14.25/100Ni10.12/100Al12/100)100-xErx(x=0.5,1,1.5,2,2.5,3)块体金属玻璃棒状试样,研究了尺寸大小对合金力学性能的影响.结果表明,当x=2,2.5时,直径为2 mm的合金试样出现了大的压缩塑性变形,塑性变形量分别达到24.59%和24.93%.而Φ 4和6 mm合金试样的压缩塑性变形基本上无变化,这就说明该非晶合金的塑性随着尺寸的增大而下降,即非晶合金压缩塑性存在尺寸效应.弹性模量、屈服强度和断裂强度也随着合金尺寸的增加而下降,即随着非晶合金尺寸的增加其力学性能逐渐降低.%Ladder (Zr63.36/100Cu14.25/100Ni10.12/100Al12/100)100-xErx(x=0.5,1,1.5,2,2.5,3) rods with diameters of 2, 4 and 6 mm were prepared by copper mold casting method.The effects of size on mechanical properties of Zr-based BMGs were studied by X-ray diffraction (XRD), universal testing machine and scanning electron microscope (SEM).The results show that when x=2 and 2.5, the specimens of 2 mm in diameter experienced a large compressive plastic deformation, which reached 24.59% and 24.93%, respectively, but the alloy specimen of 4 and 6 mm in diameter remained substantially unchanged in compressive plastic deformation.It can be concluded that the compressive plasticity of this amorphous alloy decreases as its size increases.In other words, the plasticity of amorphous alloy has size effect.Its elastic modulus, yield strength and fracture strength also decreases as its size increases, indicating that with the increase of the size of this amorphous alloy, its mechanical performance gradually decreases.