Abstract
In a nickel-iron-chromium alloy of the Elinvar type containing 2.5% titanium, it is possible to retain the titanium in solid solution by a quench from 1000°C. Aging at 600°C produces a nonmagnetic precipitate of an intermetallic compound (Ni3Ti) dispersed throughout the ferromagnetic matrix. The precipitate can be detected by changes in mechanical and magnetic properties. The internal friction, Curie point, and coercive force were measured during the course of precipitation. The effect of aging time and temperature, plastic deformation, and composition on Q was studied. Both continuous and discontinuous precipitation were observed. The decrease in strain-induced magnetostriction as a result of aging in this alloy raised the elastic modulus and changed the shape of the modulus versus temperature curve below the Curie point.
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