Effects of aspect ratio and loading rate on room-temperature mechanical properties of Cu-based bulk metallic glasses
(1. College of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang 414000, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
3. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
4. School of Physics and Electronics, Central South University, Changsha 410083, China)
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
3. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
4. School of Physics and Electronics, Central South University, Changsha 410083, China)
Abstract: Room-temperature mechanical properties of Cu50Zr40Ti10-xNix (0≤x≤4, mole fraction, %) bulk metallic glasses (BMG) with aspect ratios in the range of 1:1-2.5:1 and loading rates in the range of 1×10-5-1×10-2 s-1 were systematically investigated by room-temperature uniaxial compression test. In the condition of an aspect ratio of 1:1, the superplasticity can be clearly observed for Cu50Zr40Ti10 BMG when the loading rate is 1×10-4 s-1, while for Cu50Zr40Ti10-xNix (x=1-3, mole fraction, %) BMGs when the loading rate is 1×10-2 s-1. The plastic strain (εp), yielding strength (σy) and fracture strength (σf) of the studied Cu-based BMGs significantly depend on the aspect ratio and the loading rate. In addition, the σy of the studied Cu-based BMGs with an aspect ratio of 1:1 is close to the σf of those with the other aspect ratios when the loading rate is 1×10-2 s-1. The mechanism for the mechanical response to the loading rate and the aspect ratio was also discussed.
Key words: Cu-based bulk metallic glasses; aspect ratio; loading rate; plasticity; strength