Quaternary magnetic FeNiPC bulk metallic glasses with large plasticity

Magnetic Fe80−xNixP13C7 (x = 0, 5, 10, 15, 20, 25, 30 at.%) bulk metallic glasses (BMGs) with the diameters up to 2.5 mm were prepared by the combination method of fluxing treatment and J-quenching technique. The effect of Ni substitution for Fe on the glass formation ability (GFA), thermal stability, mechanical properties and magnetic properties has been systematically investigated. It was found that the partial substitution of Ni for Fe can enhance the GFA of Fe80P13C7 alloy, while excessive substitution will lead to the degradation of the GFA. The saturation magnetization of Fe80−xNixP13C7 (x = 0, 5, 10, 15, 20, 25, 30 at.%) BMGs gradually decrease from 1.47 T to 1.15 T with increasing Ni content from x = 0 to x = 30, and the Curie temperature firstly increases with the Ni content and then deceases when x > 20. More importantly, the quaternary monolithic Fe60Ni20P13C7 glassy alloy shows a significant plastic strain of more than 10%, which is the largest one reported to date for Fe-based BMGs. The potential beneficial effects of Ni in enhancing the GFA and the compressive plasticity of the FePC alloy system are discussed.