Non-isothermal Crystallization Kinetics of Zirconium-based Amorphous Alloys and Composites
Author of the article:ZHANG Zhen , WANG Jinhe , LI Zhengkun , FU Huameng , YANG Hongwang , LI Hong
Author's Workplace: School of Materials Science and Engineering, Shi- changxu Innovation Center for Advanced Materials, School of Metallurgy, Northeastern University
Key Words:zirconium-based amorphous alloy; amorphous composites; non-isothermal crystallization; glass transition; Avrami index
Abstract:
Amorphous alloys and their composites are prone to crystallization transformation when heated, which significantly affects their mechanical properties. Therefore, it is necessary to study the crystallization kinetic behavior of amorphous alloys and their composites, clarify the application environment of materials and quantitatively analyse the microstructure state in the application process of materials, which is of great significance for material engineering applications. In this paper, the non-isothermal crystallization kinetics of the (Zr 40.08 Ti 13.30 Cu 11.84 Ni 10.07 Be 24.71 ) 99 Nb 1 amorphous alloy and W/(Zr 40.08 Ti 13.30 Cu 11.84 Ni 10.07 Be 24.71 ) 99 Nb 1 amorphous composites were studied by differential scanning calorimetry (DSC). The results show that with increasing heating rate, the T g 、 T x1 、 T p1 、 T x2 and T p2 of Zr-based amorphous alloys and composites move to high temperatures, and the supercooled liquid region ΔT is continuously widened. The crystallization
and glass transition of both have obvious kinetic effects. Kissinger and Ozawa equations were used to calculate the activation energy of Zr-based amorphous alloys and composites, respectively. The variation in the activation energy values calculated by the two methods is consistent, but the activation energy value calculated by the Ozawa equation is slightly larger. By comparing the activation energy values of Zr-based amorphous alloys and composites, it can be concluded that the amorphous composites have stronger crystallization resistance and thermal stability. The amorphous alloy and its composites are carried out by a three-dimensional diffusion growth mode according to the Avrami exponent n(x).