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

A new Fe-based bulk metallic glass Fe-C-Si-B-P-Cr-Mo-Al 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 △T_x (△T_x = T_x - T_g), reduced glass transition temperature T_rg (T_rg = T_g/T₁) and glass-forming ability parameter γ (γ = T_x/(T_g + T₁)) 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 α-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 (ε_e) of 2.1% and plastic strain (ε_p) of 0.29%.