2. Metallic materials of the alnico type
2.1 Alni. Alnico
Initially, the alni alloy of the AlNiFe 2 type, discovered in Japan in 1932 by Mishima, had the following composition by weight: 58Fe-30Ni-12Al. Its coercive field of around 3.45 × 10 4 A · m – 1 (430 Oe) was twice as high as that of the best tungsten steels then in use. In 1938, additions of cobalt, carried out to increase M s and T C , as well as additions of copper and titanium, led to the discovery of the beneficial effect of heat treatment under a magnetic field on the anisotropic magnetic properties of this family of materials. Known as...
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Metallic materials of the alnico type
Ceramic or hard ferrite materials
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