Metal treatment – Compositions – Heat treating
Patent
1981-05-11
1983-08-16
Sheehan, John P.
Metal treatment
Compositions
Heat treating
75123K, 179117, 179120, C04B 3500
Patent
active
043989721
ABSTRACT:
Disclosed are magnetically soft ferritic multiphase Fe-Ni alloys having a Ni content in the range of about 4 to about 16 weight percent, devices containing a body fabricated from such alloys, and method for heat treating such body. Appropriate heat treatment comprises a low-temperature anneal in the two-phase (.alpha.+.gamma.) region of the Fe-Ni phase diagram, and typically results in improved magnetic properties. In particular, alloys according to the invention having x weight percent of Ni have a maximum permeability .mu..sub.m at least as large as 1.5[25(16-x).sup.2 ]G/Oe. The alloys typically also have a coercive field H.sub.c at most as large as 0.7[0.65(1+0.6x)]Oe, a saturation induction B.sub.s of at least about 20 kG, a maximum incremental permeability .DELTA..mu., measured with an applied a.c. field of about 0.005 Oe, of at least about 150 G/Oe, and a yield strength to 0.2 percent offset of at least about 40 10.sup.3 psi, with all the material properties measured at room temperature. Alloys according to the invention can advantageously be used in devices comprising a magnetically soft body, for instance in electro-acoustic transducers, e.g., in telephone receivers.
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Bordelon Chester M.
Chin Gilbert Y.
Jin Sung-ho
Sherwood Richard C.
Wernick Jack H.
Bell Telephone Laboratories Incorporated
Laumann Richard D.
Pacher Eugen E.
Sheehan John P.
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