Preparation and compression properties of Fe-C-Si-B-P-Cr-Mo-Al bulk metallic glass

A new Fe-based bulk metallic glass Fe69C7.0Si3.5B4.8P9.6Cr2.1Mo2.0Al2.0 with maximum diameter of 5 mm was successfully prepared by copper mold casting technique using industrial raw materials. The thermal stability and crystallization behavior were investigated by differential scanning calorimetry (DSC), differential thermal analysis (DTA) and X-ray diffraction (XRD). The results showed that the glass transition temperature T-g, supercooled liquid region Delta T-x(Delta T-x = T-x - T-g), reduced glass transition temperature T-rg(T-rg = T-g/T-1) and glass-forming ability parameter gamma(gamma = T-x/(T-g + T-1)) were measured to be 784 K, 27 K, 0.601, 0.388, respectively. The double-stage crystallization process of the amorphous alloy is due to the first precipitation of single alpha-Fe phase followed by the precipitation of Fe3C, Fe2P, FeB and Fe2B phases simultaneously. The bulk glassy alloy exhibits very high fracture strength of about 3870 MPa, Young's modulus (E) of 177 GPa, elastic strain (epsilon(e)) of 2.1% and plastic strain (epsilon(p)) of 0.29%.