铜基块体非晶合金纳米压痕研究

Nanoindentation study of Cu-based bulk metallic glasses

摘要:

本文利用三种不同的纳米压痕模式研究了两种铜基大块金属玻璃Cu₅₉Zr₃₆Ti₅和Cu₆₁Zr₃₄Ti₅。分别采用了加载速率控制模式、载荷控制模式和循环加载模式。当加载速率不超过5mN/S时,试样的杨氏模量随加载速率而变。Cu₅₉Zr₃₆Ti₅和Cu₆₁Zr₃₄Ti₅的弹性模量均随峰值载荷和加载速率的增加而降低。但峰值载荷和加载速率对硬度影响不大。循环加载使Cu₅₉Zr₃₆Ti₅产生轻微加工硬化,而Cu₆₁Zr₃₄Ti₅则不显示这样的结果。而且,Cu₆₁Zr₃₄Ti₅的硬度和模量都明显高于Cu₅₉Zr₃₆Ti₅。

Abstract:

In this paper, two Cu-based bulk metallic glasses, Cu₅₉Zr₃₆Ti₅ and Cu₆₁Zr₃₄Ti₅, has been studied by nanoindentation in three different ways. Load rate control mode, load control mode, and cycles load control mode nanoindentation were employed. Young’s modulus of the specimen shows loading rate dependence when the loading rate is no more than 5mN/s. The Young’s modulus of both Cu₅₉Zr₃₆Ti₅ and Cu₆₁Zr₃₄Ti₅ decreases with holding load and loading rate. But neither loading rate nor holding load has significant influence on hardness. Cyclic loading leads to slight hardening for Cu₅₉Zr₃₆Ti₅, while Cu₆₁Zr₃₄Ti₅ doesn’t show such results. What’s more, Cu₆₁Zr₃₄Ti₅ exhibits obvious higher hardness and modulus than Cu₅₉Zr₃₆Ti₅ does.