论文标题
是什么使散装金属玻璃延展/脆性？ - 中等顺序的新见解
What renders bulk metallic glass ductile/brittle? -- new insight from the medium-range order
论文作者
论文摘要
了解整体块金属眼镜（BMG）的延展性或脆性需要详细了解无定形结构。延性Pd $ _ {40} $ ni $ _ {40} $ p $ _ {20} $的中等范围订单（MRO）和脆性Zr $ _ {52.5} $ _ {52.5} $ cu $ _ {17.9.9} $ ni $ _ $ _ $ _ {14.6} $ _ {14.6} $ al $ _ $ _ $ _ $ _ $ _ $ _5 $ _5使用可变分辨率抗性电子显微镜进行3点弯曲测试。在这里，我们显示了在脆性材料中不存在的延性材料中二次较大的MRO相关长度。与文献的比较表明，较大的相关长度解释了较大的剪切转化区（STZ），从而增加了异质性。这可以使剪切带形成更容易，从而解释了变形性的差异。
Understanding ductility or brittleness of monolithic bulk metallic glasses (BMGs) requires detailed knowledge of the amorphous structure. The medium range order (MRO) of ductile Pd$_{40}$Ni$_{40}$P$_{20}$ and brittle Zr$_{52.5}$Cu$_{17.9}$Ni$_{14.6}$Al$_{10}$Ti$_5$ (Vit105) was characterized prior to and after notched 3-point bending tests using variable-resolution fuctuation electron microscopy. Here we show the presence of a second larger MRO correlation length in the ductile material which is not present in the brittle material. A comparison with literature suggests that the larger correlation length accounts for larger shear transformation zones (STZs) which increase the heterogeneity. This enables an easier shear band formation and thus explains the difference in deformability.
