Correlation Between Dynamic Compressive Strength and Fracture Behaviors of Bulk Metallic Glasses
来源期刊：Acta Metallurgica Sinica2020年第10期
论文作者：Wenqing Li Zhengwang Zhu Guojie Li Long Zhang Zhengkun Li Huameng Fu Hongwei Zhang Hong Li Aimin Wang Haifeng Zhang
文章页码：1407 - 1415
摘 要：The mechanical behaviors of Zr43.5 Cu43.5 Ni4 Al8 Nb 1,Zr55.4 Cu31.6Ni4 Al8 Nb1,Ti32.8 Zr30.2 Ni5.3 Cu9 Be22.7 （at.%） metallic glass at different strain rates were studied.For all the present alloys,the dispersion over 700 MPa was observed on the strength in the repeated dynamic compressions,which was much stronger than that of the quasi-static compressive strength.Such the dispersion of the dynamic compressive strength was well correlated with the corresponding fracture behaviors.The area of fracture surface was calculated and also showed a strong dispersion for all the fractured specimens tested at the strain rate of 500 s-1 and 1000 s-1.All the specimens showed a linear relationship between the square of dynamic compressive strength and the area of fracture surface in the dynamic compression tests.This phenomenon was mainly thought to be related to the difference of mean initial free volume concentration of different samples,stress concentration caused by the split Hopkinson pressure bar experimental setup and high sensitivity of defects under dynamic deformation.These findings were beneficial to deeply understand the effect of strain rate on the mechanical properties of the metallic glass.
Wenqing Li1,2，Zhengwang Zhu1，Guojie Li3，Long Zhang1，Zhengkun Li1，Huameng Fu1，Hongwei Zhang1，Hong Li1，Aimin Wang1，Haifeng Zhang1
1. Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences2. School of Materials Science and Engineering,University of Science and Technology of China3. Beijing Institute of Space Long March Vehicle
摘 要：The mechanical behaviors of Zr43.5 Cu43.5 Ni4 Al8 Nb 1,Zr55.4 Cu31.6Ni4 Al8 Nb1,Ti32.8 Zr30.2 Ni5.3 Cu9 Be22.7 （at.%） metallic glass at different strain rates were studied.For all the present alloys,the dispersion over 700 MPa was observed on the strength in the repeated dynamic compressions,which was much stronger than that of the quasi-static compressive strength.Such the dispersion of the dynamic compressive strength was well correlated with the corresponding fracture behaviors.The area of fracture surface was calculated and also showed a strong dispersion for all the fractured specimens tested at the strain rate of 500 s-1 and 1000 s-1.All the specimens showed a linear relationship between the square of dynamic compressive strength and the area of fracture surface in the dynamic compression tests.This phenomenon was mainly thought to be related to the difference of mean initial free volume concentration of different samples,stress concentration caused by the split Hopkinson pressure bar experimental setup and high sensitivity of defects under dynamic deformation.These findings were beneficial to deeply understand the effect of strain rate on the mechanical properties of the metallic glass.
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