日本金属学会誌

J. Japan Inst. Metals, Vol. 14, No. 3 (1950),
pp. 8-12

On the Internal Friction of iron and Nickel (1st Report)

Makoto Osawa and Yasumasa Tani


Abstract:

We measured the internal friction of pure iron and nickel with the newly designed apparatus. Measured values of internal friction for iron and nickel are 2.5 × 10-3 and 1.5 × 10-2 respectively, and these values are very large as compared with those for non-ferromagnetic metals. They have close dependency upon magnetic field and are decreased considrably by a small amount of elongation,this being contrary to observations with non-ferromagnetic metals.It is difficult to explain these effects by the theory based on the plastisity, that is, dislocation and lattice imperfecfion. We consider that the internal friction of ferromagnetic materials is due mainly to the energy loss of magnetoelastic coupling, that is, domain boundary shift of 90°—wall,and to the energy loss of eddy current arisen from the change of local magnetic flux by the magnetselastic coupling,and by these loss we could explain several observed phenomena.


(Received 1949/7/7)

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