Crystallization Behavior of Fe50−xCr15Mo14C15B6Mx (x = 0, 2 and M=Y, Gd) Bulk Metallic Glasses and Ribbons by in situ High Temperature X-Ray Diffraction

The effect of rare earth addition on thermal stability of Fe 50-xCr 15Mo 14C 15B 6M x(x = 0, 2 and M=Y, Gd) is studied. Thermal and structural properties are measured using differential scanning calorimetry and x-ray diffraction, respectively. The microstructure is observed by using a scanning electron microscope, and chemical composition is checked by energy dispersive spectroscopy analysis. The effect of high temperature on the isothermal crystallization of Fe 50-xCr 15Mo 14C 15B 6M x(x = 0, 2 and M=Y, Gd) bulk metallic glass and ribbons is investigated by high-temperature x-ray diffraction. It is found that the crystallization behavior of Fe 50-xCr 15Mo 14C 15B 6M x(x = 0, 2 and M=Y, Gd) bulk metallic glass strongly depends on the annealing temperature. The different crystallization behavior is believed to be due to the different structures that the metallic glass possesses at different temperatures.