Mechanical properties of Fe-based bulk glassy alloys in Fe–B–Si–Nb and Fe–Ga–P–C–B–Si systems

Abstract

Mechanical properties of cast Fe-based bulk glassy alloy rods with compositions of (Fe_0.75B_0.15Si_0.1)₉₆Nb₄ and Fe₇₇Ga₃P_9.5C₄B₄Si_2.5 were examined by compression and Vickers hardness tests. The Young's modulus (E), yield strength (σ_y), fracture strength (σ_f), elastic strain (ε_e), fracture strain (ε_f), and Vickers hardness (H_v) were 175 GPa, 3165 MPa, 3250 MPa, 1.8%, 2.2%, and 1060, respectively, for the former alloy and 182 GPa, 2980 MPa, 3160 MPa, 1.9%, 2.2%, and 870, respectively, for the latter alloy. The ε_f /E and H_v/3E were 0.019–0.017 and 0.020–0.016, respectively, for the alloys, in agreement with the previous data for a number of bulk glassy alloys. The agreement suggests that these Fe-based bulk glassy alloys have an elastic–plastic deformation mode. The syntheses of high-strength Fe-based bulk glassy alloys with distinct compressive plastic strain and elastic–plastic deformation mode are encouraging for future development of Fe-based bulk glassy alloys as structural and soft magnetic materials.