On the Properties of Semihard Magnetic Alloys “Recalloy” in the Fe-Nb-Co and Fe-Ta-Co Systems

DOI Web Site Web Site

Bibliographic Information

Other Title
  • Fe-Nb-Co系およびFe-Ta-Co系半硬質磁性合金「Recalloy」の特性について
  • Fe Nb Coケイ オヨビ Fe Ta Coケイ ハン コウシツ ジセイ ゴ
  • On the Properties of Semihard Magnetic Alloys “Recalloy” in the Fe-Nb-Co and Fe-Ta-Co Systems

Search this article

Abstract

Magnetic properties, thermal expansion coefficient, electrical resistivity and hardness have been studied for Fe-Nb-Co alloys containing less than about 4%Nb and less than 25%Co or Fe-Ta-Co alloy scontaining less than about 8%Ta and less than 30%Co. All alloys used in this study were water quenched from 1050°C, cold drawn by 97.2% reduction in area and subsequently reheated at 400∼1000°C for less than 5 h. The magnetic properties for Fe-Nb-Co and Fe-Ta-Co alloys depend remarkably on the cobalt concentration, reheating temperature and reheating time. With increasing Co content of these alloys in both systems, the thermal expansion coefficient decreases monotonously, the hardness increases monotonously, and the electrical resistivity shows a maximum at the composition of 15%Co content. The magnetic properties of Recalloys, which were water quenched, cold drawn and subsequently reheated at 700°C for 30 min, exhibit very superior values as follows. For Fe-about 3%Nb-20%Co alloy: B8(at 8 kA·m−1)=1.95 T, Br=1.80 T, Br⁄B8=0.923, Hc=1.10 kA·m−1 and \sqrt(BH)max⁄BrHc=0.935; for Fe-about 3%Ta-20%Co alloy: B8=2.10 T, Br=1.95 T, Br⁄B8=0.924, Hc=1.29 kA·m−1 and \sqrt(BH)max⁄BrHc=0.907. α at 0∼40°C, ρ and Hv in the above alloys are 110×10−7, 0.206 μΩ·m and 345 or 115×10−7, 0.169 μΩ·m and 381, respectively.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top