Correlation among the amorphous forming ability, viscosity, free-energy difference and interfacial tension in Fe–Si–B–P soft magnetic alloys

• Published in: Journal of alloys and compounds 2020-08, Vol.831, p.154784, Article 154784
• Main Authors: Zhang, Chengzhong, Chi, Qiang, Zhang, Jianhua, Dong, Yaqiang, He, Aina, Zhang, Xiaoxiong, Geng, Pulong, Li, Jiawei, Xiao, Huiyun, Song, Jiancheng, Shen, Baolong
• Format: Article
• Language: English
• Subjects: Alloy systems; Alloys; Amorphous alloys; Amorphous forming ability; Coercivity; Cooling; Gibbs free-energy difference; Interfacial tension; Magnetic alloys; Magnetic permeability; Magnetic properties; Magnetism; Metallic glasses; Permeability; Surface tension; Viscosity
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.154784

To clarify the underlying mechanism of effects of P on amorphous forming ability (AFA) for Fe–Si–B–P alloy system, the AFA and melting viscosity of (Fe76Si9B10)(100-x)/95Px (x = 0–3) amorphous alloys measured in the temperature range of 1200–1450 °C by oscillating cup method were investigated. A viscosity hysteresis occurs at about 1350 °C between the heating and cooling processes for all alloys, and the values of viscosity almost increase as P content increases at each measured temperature under cooling process. However, only considering viscosity cannot provide a satisfactory explanation for the trend of AFA for this alloy system. Afterwards, the mechanism was well revealed by calculating the Gibbs free-energy difference and speculating the interfacial tension. In addition, a positive correlation between magnetic properties (coercivity and effective permeability) and the AFA of this alloy system was also founded, which can provide an auxiliary in understanding the mechanism of AFA to some extent. Meanwhile, when x = 3, the alloy shows excellent soft magnetic properties including low coercivity of 0.9 A/m and high effective permeability of 17,000, which is promising for future electromagnetic device application. •The viscosity of FeSiBP alloys presents a increase trend with P content rising.•The free-energy difference of FeSiBP alloys decreases as increasing P content.•Correlation among the AFA, viscosity and free-energy difference was established.•A minimum Hc of 0.9 A/m and a maximum μe of 17,000 was obtained.