Fe-(Cr, Mo)-(C, B)-Tm bulk metallic glasses with high strength and high glass-forming ability

The glass-forming ability and mechanical properties of (Fe, Co)-(Cr, Mo)-(C, B)-Tm glassy alloys have been investigated. The (Fe, CO)₄₈Cr₁₅Mo₁₄C₁₅ B₆Tm₂ glassy alloys were prepared in a cylindrical form with a diameter of 18 mm. The largest supercooled liquid region before crystallization in (Fe_1-xCo_x)₄₈ Cr₁₃5Mo₁₄C₁₅B₆TM₂ alloys is 90 K for Co₄₈Cr₁₅ Mo₁₄ C₁₅B₆Tm₂. These glassy alloys have high fracture strength of over 4100 MPa for the entire composition range and the strength level is almost independent of Co content. The combination of high strength and high glass-forming ability indicates high possibility of applying the (Fe, Co)-(Cr, Mo)-(C, B)-Tm glassy alloys to various industrial materials.