Investigation On Corrosion Resistance And Thermal Stability Of ZrTiCuNiBe Bulk Metallic Glass

The corrosion resisitance and thermal stability of Zr41Ti14Cu12.5Ni10Be22.5 bulk amorphous alloy have been investigated by electrochemistry workstation, high precision expansion instrument, X-Ray diffraction, DSC and other instruments. Corrosion resistance of Zr41Ti14Cu12.5Ni10Be22.5 bulk amorphous alloy in several kinds of solutions was studied using the method of immersion corrosion. The results show that compared with other materials, Zr41Ti14Cu12.5Ni10Be22.5 bulk amorphous alloy exhibits a better corrosion resistance. Weight loss of the sample is less. The surface is cleaner and does not fade after immerging for a long time. The polarization curves show that the self-corrosion electric potential moves to the positive direction compared with the crystallized sample. Experiments of steam corrosion and high temperature corrosion have been done using a self-made device. The result shows that the Zr41Ti14Cu12.5Ni10Be22.5 amorphous alloy exhibits a better steam corrosion and high temperature corrosion resistance. Using the thermal expansion equipment, the thermal expansion behavior of Zr41Ti14Cu12.5Ni10Be22.5 amorphous alloy was investigated. The result shows that the thermal expansion coefficient descreases with increase of temperature when the tempreture is below 473K, and repeated heating of the sample made the coefficient of expansion recover.The amorphous structure transformation annealed in vacuum was analyzed with X-Ray diffraction and DSC thermodynamic measurements. The result shows that structure relaxation is the key process below Tg. When the teperature is higher than Tx, the amorphous structure will be crystallized. The different crystalline phases appear.