Study Of Mechanical Property Of Bulk Metallic Glass Matrix Composites

Metallic glass has excellent physical, chemical and mechanical properties due to its special atomic structure configuration. This led to the foundation for the wide application in the various fields of the metallic glass. But the metallic glass presents brittleness at room temperature, So it can not give full play to its advantages in structures. Therefore, in order to increasing the plasticity of metallic glass, people produce the metallic glass composites by adding a second phase in it. This paper chooses endogenous phase and adscititious particles metallic glass composites as the research object. Based on the tensile, compression and nanoindentation experiments, using the finite element simulation, the effect of the second phase on the plasticity of metallic glass, the tensile and compressive deformation behavior of the metallic glass composite were studied. The main work of this paper is as follows:(1) Based on the existing experiments, combined with experimental data in the literature, tne Drucker-Prager yield criterion was used to describe the tension and compression asymmetry behavior of metallic glass. Using the constitutive model in ABAQUS, the tensile and compression behaviors of endogenous phase bulk metallic glass matrix composites are simulated by using single particle and multi particle representative volume element. The results show that the Drucker-Prager model can well simulate the stress-strain curve of tension and compression for the endogenous phase toughening metallic glass matrix composites.(2) Tension compression and the nanoindentation experiment in different loading rates and maximum loads are performed on Zr55Cu30Ni5Al10 metallic glass and (Zr70Ni10Cu30)84Ta6Al10 metallic glass composites. The tension and compression experiment results show that the second phase makes the plasticity of metal glass greatly improving. The Nanoindentation experiments show that the deformation behavior of metallic glass under compression shows obvious rate dependency and creep effect.(3) The nanoindentation process of different curvature radius of pressure head pressing into Zr55Cu30Ni5Al10 metallic glass is simulated by using the finite element software ABAQUS. Then combining with theoretical analysis, we study the relationship between hardness and curvature radius of pressure head and indentation depth. Then we choose the appropriate constitutive model to simulate the rate effect and creep effect of matallic glass in compreesion deformation.