Abstract
The present study demonstrates that Ti-based metallic glass matrix composites (MGMCs) with a normal composition of Ti43Zr32Ni6Ta5Be14 containing ductile dendrites dispersed in the glass matrix has been developed, and deformation mechanisms about the tensile property have been investigated by focusing on twinning-induced plasticity (TWIP) effect. The Ti-based MGMC has excellent tensile properties and pronounced tensile work-hardening capacity, with a yield strength of 1100 MPa and homogeneous elongation of 4%. The distinguished strain hardening is ascribed to the formation of deformation twinning within the dendrites. Twinning generated in the dendrites works as an obstacle for the rapid propagation of shear bands, and then, the localized necking is avoided, which ensures the ductility of such kinds of composites. Besides, a finite-element model (FEM) has been established to explain the TWIP effect which brings out a work-hardening behavior in the present MGMC instead of a localized strain concentration. According to the plasticity theory of traditional crystal materials and some new alloys, TWIP effect is mainly controlled by stacking fault energy (SFE), which has been analyzed intensively in the present MGMC.
Highlights
Bulk metallic glasses (BMGs) are recognized as potential structural materials due to their superior performance, such as high strength, large elastic limit, and excellent corrosion and wear resistance, etc.[1]
Crystalline phases were identified by X-ray diffraction (XRD), transmission electron microscopy (TEM), and high resolution TEM (HRTEM) in a JEM-2010 microscope
Different from the ductilization mechanisms induced by phase transformation and/or typical particles such as Ta within MGMCs28, the main plastic deformation mechanisms in the current composites are ascribed to deformation twins
Summary
Bulk metallic glasses (BMGs) are recognized as potential structural materials due to their superior performance, such as high strength, large elastic limit, and excellent corrosion and wear resistance, etc.[1] They generally fail in a brittle manner under uniaxial quasistatic loading at room temperature[2]. To alleviate this challenge, a series of in-situ dendrite-reinforced metallic glass matrix composites (MGMCs) with large tensile ductility have been developed, such as Ti-based and Zr-based MGMCs3–5. A series of in-situ dendrite-reinforced metallic glass matrix composites (MGMCs) with large tensile ductility have been developed, such as Ti-based and Zr-based MGMCs3–5 Most of these composites exhibit softening rather than work hardening after yielding upon tension at room temperature, associated with localized necking. A Nano Indenter II tester (MTS Systems, USA) with a trihedral Berkovich indenter was used to calculate the Young’s modulus of both the glass matrix and dendrites at room temperature
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