Effect of V and V + Ti additions on the structure and properties of Fe-Cr-Co ductile magnet alloys

Abstract

The vertical sections of the Fe-Cr-Co system at 15wt%Co + 3wt%V, at 15wt%Co + 5wt%V, and at 15wt%Co + 3wt%V + 2wt%Ti are constructed. The extension of the α phase region of the system at 15%Co and 5%V, and at 15%Co and 3%V + 2%Ti is enough to allow for the solution treatment of the alloys with 21∼23%Cr at any temperature above the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\alpha_{1}+\alpha_{2}</tex> miscibility gap. After step-tempering, their magnetic properties are given as Br=13.5 KG (1.35T), Hc=550 Oe (44kA/m) and (BH)max=5.5 MGOe (44kJ/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> ). The addition of V or V + Ti to the Fe-Cr-Co system can facilitate the practical manufacture of permanent magnets.