Mesoscopic Finite Element Simulation For Deformation Behavior Of Bulk Metallic Glass Matrix Composites

Bulk metallic glass matrix composites not only keep the excellent mechanical properties of bulk metallic glass,such as high strength,high hardness,wear resistance and corrosion resistance,but also effectively improve their plastic deformation ability;thus they have an extensive application prospects.However,there are still many shortages in the investigating the monotonic tensile deformation mechanism of bulk metallic glass matrix composites.moreover,the study on the cyclic deformation behavior is still in its infancy.Thus,a further investigation on the deformation mechanism should be conducted.In this paper,the monotonic tensile and uniaxial cyclic deformation behavior of bulk metallic glass matrix composites are discussed by experiment and finite element method.And the main contents of this work are listed as follows:1.At room temperature,the uniaxial tensile and compression tests of Ti-based metallic glass and its composites with dendritic were conducted;moreover,the fracture surfaces of the sample ware observed by scanning electron microscope(SEM).Then based on the experiment results,the mechanical properties and deformation mechanism of the matrix and composite subjected to uniaxial tensile and compressive loadings were investigated.The tensile-unload cycle test and the tensile-compression cyclic test for the composites containing dendrite were conducted,respectively.Then,the cyclic evolution characteristics of the bulk metallic glass composites were discussed.2.The three-dimensional finite element models of bulk metallic glass matrix composites were constructed based on the random adsorption algorithm,and the finite element simulation on the deformation behaviors of bulk metallic glass matrix composites under uniaxial tension was performed by using ABAQUS.With the help of the user material subroutines,the free volume constitutive model was implemented for describing the deformation of metallic glass.The evolution of free volume concentration was adopted to characterize the nucleation and propagation of shear bands in the BMG matrix in this paper.The effect of microstructure on uniaxial tensile behavior of composites has been investigated in this work.3.The finite element simulation on the deformation behaviors of bulk metal glass under cyclic loading was performed,and the effect of loading amplitude and loading history on the cyclic deformation behavior of the material was discussed.The finite element simulation on the deformation behaviors of the particle reinforced block metal glass matrix composites under cyclic loading was performed.The volume fraction and the characteristics of cyclic evolution of the particles,which influence on the cyclic deformation behaviors of the composite material were discussed.