Abstract
Cold rolling (CR) with thickness reduction of 10%, 30%, and 50% was applied to Zr50Cu44Al6 and Zr49.5Cu44Al6Nb0.5 metallic glassy ribbon samples. The XRD patterns showed the amorphousness of all samples after casting and CR processes. The SEM images indicated the formation of multiple shear bands (SBs) owing to plastic deformation during CR. However, the addition of 0.5 at% Nb to the alloy changed the SBs’ density and spacing characteristics. The characterization of free volume changes caused by CR was carried out by measuring the density of Archimedes. The micro-hardness of samples was studied by investigating SBs and free volume during plastic deformation. Alloy softening occurred due to the formation of free volume during CR. X-ray photoelectron spectroscopy (XPS) confirmed the presence of oxides ZrO2, CuOx, and AlOx on the surface of the ribbons. The anodic polarization curves of the cast and R50 samples in solutions of NaCl and Na2SO4 (0.5 M) were obtained using potentiodynamic polarization measurements. Compared to CR ribbons, melt-spun ribbons after casting showed better corrosion resistance with lower anodic current densities in Na2SO4 solution.
Highlights
Metallic glass can be produced in the form of fast solidifying ribbons and bulk metallic glass (BMG) [1]
It is clear that when the plastic strain increased to 50%, more free volume (FV) was introduced in sample A1, which was about 2.5 times that of A2
Band It evoluinteresting to notice that the shear band densities measured during this study agreed well tion during different plastic strains was studied by scanning electron microscope (SEM) observations (Figure 2)
Summary
Metallic glass can be produced in the form of fast solidifying ribbons (usually about30-μm thick) and bulk metallic glass (BMG) (thickness > 1 mm) [1]. Metallic glass can be produced in the form of fast solidifying ribbons To understand the deformation mechanism and to analyze the relationship between the shear band of metallic glass and mechanical properties, it is necessary to understand some parameters of SBs, including the density of SBs, mean distance between SBs, and the intersection between SBs during severe plastic deformation [8]. It has been experimentally confirmed that a decrease in FV (due to structural relaxation) causes the material to become brittle. This increases hardness and modulus, reduces shear band formation capacity, and reduces fracture toughness [2]
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