Abstract
In-situ dendrite/metallic glass matrix composites (MGMCs) with a composition of Ti46Zr20V12Cu5Be17 exhibit ultimate tensile strength of 1510 MPa and fracture strain of about 7.6%. A tensile deformation model is established, based on the five-stage classification: (1) elastic-elastic, (2) elastic-plastic, (3) plastic-plastic (yield platform), (4) plastic-plastic (work hardening), and (5) plastic-plastic (softening) stages, analogous to the tensile behavior of common carbon steels. The constitutive relations strongly elucidate the tensile deformation mechanism. In parallel, the simulation results by a finite-element method (FEM) are in good agreement with the experimental findings and theoretical calculations. The present study gives a mathematical model to clarify the work-hardening behavior of dendrites and softening of the amorphous matrix. Furthermore, the model can be employed to simulate the tensile behavior of in-situ dendrite/MGMCs.
Highlights
In-situ dendrite/metallic glass matrix composites (MGMCs) with a composition of Ti46Zr20V12Cu5Be17 exhibit ultimate tensile strength of 1510 MPa and fracture strain of about 7.6%
Lack of pronounced macroscopic plasticity of bulk metallic glasses (BMGs) are correlated with highly localized shear banding, and a great amount of plastic strain is accumulated in narrow shear bands, exhibiting strain softening by adiabatic shearing[4]
It should be noted that most of the developed in-situ MGMCs exhibit softening upon tension rather than work hardening upon compression[6], giving an implication that the tensile mechanism may be very different from the corresponding compressive one
Summary
In-situ dendrite/metallic glass matrix composites (MGMCs) with a composition of Ti46Zr20V12Cu5Be17 exhibit ultimate tensile strength of 1510 MPa and fracture strain of about 7.6%. The model can be employed to simulate the tensile behavior of in-situ dendrite/MGMCs. D ue to their unique properties, including exceptionally high strength, elastic limit, and hardness, excellent corrosion resistance, reduced sliding friction, improved wear resistance etc.[1,2,3], bulk metallic glasses (BMGs) are regarded as potential candidate materials in engineering fields. Thereinto, ductile dendrite/metallic glass matrix composites, with a homogeneous distribution, high glass-forming ability of matrices, and improved toughness, have been widely developed to solve the conflict between strength and toughness[6,17,18] In these in-situ MGMCs, the amorphous matrix provides extreme strength, while the dendrites can apparently suppress catastrophic failure due to shear localization, and lead to legitimate plastic flows. We explored the tensile mechanisms, based on the theoretical calculations and finite-element method (FEM) analysis
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