用纳米压痕仪测量Cu50Zr43Ti7非晶合金的硬度和弹性模量

Measurements of Hardness and Elastic Modulus by Nanoindenter for Cu50Zr43Ti7 Amorphous Alloy

摘要:

用Berkovich和Cube-Corner压头分别测量了Cu50Zr43Ti7非晶合金的硬度(H)和弹性模量(E)。结果发现，该合金的H和E与压头形状及测量所用载荷无关，H=(6.5±0.2) GPa，E=(114.4±2.1) GPa；相对于Berkovich压头，用Cube-Corner压头得到的压痕周围观察到较多的剪切带。该合金没有硬度的尺寸效应，变形也没有明显的加工硬化。用有限元(FE)计算得到该合金的屈服强度(s)约为1.8 GPa，与压缩试验结果相符。

Abstract:

Nanoindentation tests have been performed for Cu50Zr43Ti7 bulk metallic glass with a Berkovich indenter and a cube-corner indenter, respectively. It is found that the measured hardness (H) of (6.5±0.2) GPa and the elastic modulus (E) of (114.4±2.1) GPa are independent of the indenter tip shape and the applied indentation loads used in the tests. Many shear bands were observed around the impressions by the cube-corner indenter if compared to with the Berkovich indenter for the alloy without the indentation-size effect (ISE) and strain hardening during the indentation tests. The yield strength (s) of the alloy is about 1.8 GPa by finite element (FE) calculation, good agreement with the experimental results.