Abstract
The crystallization kinetics of the 50% W particles/Zr41.2Ti13.8Cu12.5Ni10Be22.5 metallic glass matrix composite were studied by differential scanning calorimetry (DSC), X-ray diffraction (XRD), and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS). The results showed that the crystallization and the glass transition of the composite both have a kinetic effect. The characteristic temperatures Tg and Tx of the composite are linearly related to the natural logarithm of the heating rate (lnφ), and the presence of W particles increases the dependence of the glass transition on the heating rate. With the addition of W particles, the viscosity of the amorphous matrix in the supercooled liquid region increases, which hinders the spread and migration of the alloy elements and causes the thermal stability of the supercooled liquid to improve. In the isothermal crystallization, the mode of nucleation and the growth process of the crystal changes with the annealing temperature. The Avrami exponent with the crystallized fraction at 698 K was about 2.5 in the middle stage of the crystallization, implying three-dimensional growth with a constant nucleation rate.
Highlights
The important application value of Zr-based bulk metallic glass (BMG) can be attributed to its unique properties, such as high strength, high hardness, self-sharpening, and good corrosion resistance [1,2,3,4,5,6,7], but its brittleness at room temperature limits its further application
W particles/Zr41.2 Ti13.8 Cu12.5 Ni10 Be22.5 metallic glass matrix composite was prepared, and the crystallization kinetics of the material were studied by X-ray diffraction (XRD), scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), and differential scanning calorimetry (DSC)
The typical scattering diffusion peak is found from the curve of the Zr41.2 Ti13.8 Cu12.5 Ni10 Be22.5 BMG, which indicates an amorphous structure of the material
Summary
The important application value of Zr-based bulk metallic glass (BMG) can be attributed to its unique properties, such as high strength, high hardness, self-sharpening, and good corrosion resistance [1,2,3,4,5,6,7], but its brittleness at room temperature limits its further application. The main solution to the brittleness is improving the room temperature plasticity of BMG via the in situ or ex situ introduction of appropriate second phases to the amorphous matrix to obtain bulk metallic glass matrix composite (BMGMC), which has been widely researched [8,9,10,11,12,13,14,15]. Zr-based BMGMC by infiltrating the Zr38 Ti17 Cu10.5 Co12 Be22.5 melt into porous tungsten and studied the dynamic mechanism of fracture and deformation behavior of this composite [21]. Qiu and his team prepared 60 vol.% W particles-reinforced Zr41.2 Ti13.8 Cu12.5 Ni10 Be22.5 BMGMC and reported that the plasticity and dynamic compression strength for the composite both increased when W particles were. W particles/Zr41.2 Ti13.8 Cu12.5 Ni10 Be22.5 metallic glass matrix composite was prepared, and the crystallization kinetics of the material were studied by X-ray diffraction (XRD), scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), and differential scanning calorimetry (DSC)
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