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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Berkovich nanoindentation of Zr55Cu30Al10Ni5 bulk metallic glass at a constant loading rate
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Berkovich nanoindentation of Zr55Cu30Al10Ni5 bulk metallic glass at a constant loading rate

机译：Berkovich Zr55Cu30Al10ni5散装金属玻璃以恒定的装载速率的纳米凸缘

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摘要

Berkovich nanoindentation experiments were conducted on Zr55Cu30Al10Ni5 bulk metallic glass under a constant loading rate. Indentation hardness decreased linearly with contact depth, which defied the direct application of conventional indentation size effect model for crystalline material. Elastic modulus remained invariant under small loads, but decreased linearly under large loads. The scaling relationships between indentation variables such as contact depth, permanent depth, the maximum indentation displacement, plastic energy, the total work of indentation and their ratios were investigated. The area of shear band circle, the projected contact area at the maximum load, and the residual projected area were all found to be proportional to one another. A new methodology to determine fracture toughness was proposed based on the total work of indentation, provided that the critical indentation displacement at the onset of fracture corresponds to zero value of elastic modulus extrapolated from curve fitting.
机译：在恒定加载速率下，对Zr55Cu30Al10Ni5大块金属玻璃进行了Berkovich纳米压痕实验。压痕硬度随接触深度呈线性下降，这与晶体材料常规压痕尺寸效应模型的直接应用不同。弹性模量在小载荷下保持不变，但在大载荷下呈线性下降。研究了接触深度、永久深度、最大压痕位移、塑性能、压痕总功及其比值等压痕变量之间的标度关系。剪切带圆的面积、最大载荷下的投影接触面积和剩余投影面积都是成比例的。提出了一种基于压痕总功确定断裂韧性的新方法，前提是断裂开始时的临界压痕位移对应于通过曲线拟合外推的弹性模量的零值。

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