Magnetic Properties of Severely Cold-drawn Fe-Cu Alloys

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Iron-Copper alloys, severely cold drawn, have good magnetic properties as semi-hard magnetic materials. The specimens containing 30〜70wt%Fe and Cu balanced, were reduced 55.6〜98.6% by cold drawing and then subjected to tempering treatment at temperatures ranging from 100 to 1000℃. We have got following results. The cross-section of iron phase in copper matrix is about O. lxlμ, when the alloys are severely cold drawn up to the reduction of 98.6%. The more severely cold drawing is carried out, the larger become residual induction (Br.) squareness (Br/B_<400>)-and especially coercive force. Of course, the values of saturation induction increase in proportion to iron contents. But the coercive forces inversely decrease as drawing is much more carried out, and eventually come to obey the equation of _jH_c = _jH_c (O).(I-P). When specimens are tempered at 380〜400℃ after the reduction of high percentage, their coercive forces suddenly increase, taking peak value of about 240 Oe for the specimen cold-reduced 98.6%.
明治大学の論文