【摘要】 分别采用加载速率控制、载荷控制和循环加载3种不同的纳米压痕模式研究了2种铜基大块金属玻璃Cu_<sub>59Zr₃₆Ti₅和Cu₆₁Zr₃₄Ti₅的硬度和弹性模量。当加载速率不超过5 mN/s时,试样的杨氏模量随加载速率而变化。Cu_<sub>59Zr₃₆Ti₅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Cu_<sub>59Zr₃₆Ti₅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Cu_<sub>59Zr₃₆Ti₅。更多还原

【Abstract】 The hardness and Young’modulus for two Cu-based bulk metallic glasses, Cu_<sub>59Zr₃₆Ti₅ and Cu₆₁Zr₃₄Ti₅, has been studied by nanoindentation in three different ways, including load rate control mode, load control mode, and cycles load control mode. Young’s modulus of the specimen shows the dependence on loading rate when the loading rate is no more than 5 mN/s. The Young’s modulus of both Cu_<sub>59Zr₃₆Ti₅ and Cu₆₁Zr₃₄Ti₅ decreases with the increasing of holding load and loading rate. But neither loading rate nor holding load has significant influence on hardness. Cyclic loading leads to slight hardening for Cu_<sub>59Zr₃₆Ti₅, while Cu₆₁Zr₃₄Ti₅ doesn’t show such results. What’s more, Cu₆₁Zr₃₄Ti₅ exhibits obviously higher hardness and modulus than Cu_<sub>59Zr₃₆Ti₅.更多还原