Title :
New gold permanent magnet alloys
Author :
Homma, Motofumi ; Tsutsumi, Sei-ichi ; Okada, Masuo ; Minowa, Takehisa
Author_Institution :
Tohoku University, Sendai, Japan
fDate :
1/1/1982 12:00:00 AM
Abstract :
A gold permanent magnet for an ornamental material is developed in a Au-Fe-Co system. The magnetic properties of the various Au-based alloys are studied. It is found that the magnetic properties of the Au-7.2wt %Fe-4.8wt %Co alloy aged at 600°C for 10 min and subsequently controlled-cooled to 400°C at a cooling rate of 50°C/h, are Br = 0.27 T (2700 G), iHc = 41.2 kA/m (515 Oe), and (B-H) max = 3.4 kJ/m3(0.43 MGOe). The cold-swaging improved the magnetic properties of the alloy as Br = 0.34 T (3400 G), iHc = 81.2 kA/m (1015 Oe), and (B-H) max = 8.2 kJ/m3(1.03 MGOe). Microstructural observations indicate that the magnetic hardening is due to the fine iron-cobalt particles precipitated in the Au matrix.
Keywords :
Consumer products; Gold materials/devices; Permanent magnet materials; Aging; Aluminum alloys; Cobalt alloys; Gold alloys; Iron alloys; Magnetic materials; Magnetic properties; Magnetization; Nickel alloys; Permanent magnets;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1982.1061766