Crystallization Kinetics of 50% W Particles/Zr41.2Ti13.8Cu12.5Ni10Be22.5 Metallic Glass Matrix Composite

Metals

Xiaodong Kong¹  Xiaohong Su¹  Huie Hu¹  Zhou Lu¹ 

[1] Department of Basic Course, Naval University of Engineering, Wuhan 430033, China;

关键词: crystallization kinetics;    W particles;    metallic glass matrix composite;    thermal stability;   

DOI  :  10.3390/met8121011

来源: DOAJ

【 摘 要 】

The crystallization kinetics of the 50% W particles/Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5 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 T_g and T_x 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.

【 授权许可】

Unknown