Lecture image placeholder

Premium content

Access to this content requires a subscription. You must be a premium user to view this content.

Monthly subscription - $9.99Pay per view - $4.99Access through your institutionLogin with Underline account
Need help?
Contact us
Lecture placeholder background


MMM 2022

November 07, 2022

Minneapolis, United States

Effect of Si/Al addition on magnetic properties of Fe Co alloy

Motor-driven systems are estimated to use over 40% of all global electricity consumption, giving rise to over 6 Gt of CO2 emissions 1. To reduce the impact, motors should have higher efficiency. Electrical steels, Fe-Si which have low iron losses are commonly used as soft magnetic materials for motors but higher Bs materials have been desired for higher power density motors. It is well known that Fe-Co alloys have the highest Bs among bulk, stable materials. In fact, Permendur, 49Fe-49Co-2V (mass %) is already used in some high-performance motors, since it has a good soft magnetic properties. However, the drawbacks of Permendur are poor workability owing to the existence of a the brittle B2 phase (ordered phase) . In this study, we first conducted neutron diffraction measurements on the Fe-Co alloys with different Co contents to check the existence of the B2 phase in these alloys. And then, the effect of Si/Al addition on magnetic properties of 82Fe-18Co alloy was investigated in order to improve the soft magnetic properties.

Experimental Procedures
Four samples with different Co contents (49Fe-49Co-2V, 73Fe-27Co, 82Fe-18Co, and 95Fe-5Co) were prepared through melting, casting, forging and annealing processes. The neutron diffraction study was conducted with iMATERIA spectrometer at the Materials and Life Sciences Facility at the J-PARC (Japan Proton Accelerator Research Complex). For the study of Si/Al addition, 0.2 mm-thick sheets with the addition of Si/Al in the range of 0~1.75 mass% were prepared by melting, casting process, followed by forging, annealing, hot and cold rolling processes. Magnetic properties were measured with a BH-tracer.

The result showed that 49Fe-49Co-2V and 73Fe-27Co alloys contained the B2 phase. On the other hand, 82Fe-18Co and the 95Fe-5Co did not contain B2, which suggests that these two alloys will likely to have good workability. Therefore, we chose 82Fe-18Co alloy for the investigation of Si/Al addition. Fig. 1 shows the soft magnetic properties of 82Fe-18Co with and without Si/Al addition. It was found that the small addition of Si/Al reduced the iron loss while maintaining high Bs.
1 Paul Waide & Conrad U. Brunner et al., IEA Energy Efficiency Series, Working Paper, 2011.

Fig. 1 Effect of Si and Al addition on the soft magnetic properties of Fe-18Co alloy

Next from MMM 2022

Study on the Loss Characteristics of Silicon Steel with Different Si Content Considering the Effect of Temperature

Study on the Loss Characteristics of Silicon Steel with Different Si Content Considering the Effect of Temperature

MMM 2022

Deji Ma and 2 other authors

07 November 2022

Stay up to date with the latest Underline news!

Select topic of interest (you can select more than one)


  • All Lectures
  • For Librarians
  • Resource Center
  • Free Trial
Underline Science, Inc.
1216 Broadway, 2nd Floor, New York, NY 10001, USA

© 2023 Underline - All rights reserved