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利用单轴压缩试验研究了用部分Al替代Zr对Zr35-xTi30Cu7.5Be27.5Alx(x=0,1,1.5,2,2.5,5,at%)块体金属玻璃力学性能的影响。研究表明,当添加Al含量为1.5at%和2at%时,所得到的块体金属玻璃的压缩塑性从0.95%(x=0)分别提高至15.10%(x=1.5)和3.45%(x=2)。利用扫描电子显微镜(SEM)对金属玻璃样品的断裂形貌进行了表面分析。利用透射电子显微镜(TEM)对不同Al含量的块体金属玻璃试样进行了微观结构表征,结果显示,Al含量为1.5at%和2at%的金属玻璃样品的微观结构呈现出了纳米级别的“微观不均匀性”。最后,结合临界剪切应力(CSS)讨论了微观结构与塑性变形行为之间的关联性。
Uniaxial compressive tests were carried out to investigate the effect of partial Al substitution for Zr on the mechanical properties of Zr35-xTi30Cu7.5Be27.5Alx (x = 0,1,1.5,2,2.5,5, at%) bulk metallic glasses. The results show that the compressive plasticity of bulk metallic glass increases from 0.95% (x = 0) to 15.10% (x = 1.5) and 3.45% (x = 2). The fracture morphology of metallic glass samples was analyzed by scanning electron microscopy (SEM). The microstructure of bulk metallic glass samples with different Al contents was characterized by transmission electron microscopy (TEM). The results showed that the microstructure of metallic glass samples with Al content of 1.5at% and 2at% “Microscopic heterogeneity”. Finally, the relationship between microstructure and plastic deformation behavior is discussed in combination with critical shear stress (CSS).