Influence of the Thermal and Mechanical History on the Squareness Characteristics of 4–79 Molybdenum Permalloy

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Abstract
A correlation was obtained between crystallographic texture and the squareness characteristics of 4–79 molybdenum Permalloy wire and tape. When cold drawn (99% RA) 2.18-mil-diam Permalloy wire was annealed at 800°C for 0–7.8 sec, 60 cps Br/Bs values (measured along the wire axis) dropped from 0.95 to 0.70. Further drawing of the annealed wires to 1.3 mil resulted in an increase of Br/Br, relative to the 2.18-mil wire, for the short-anneal (0.31 and 0.65 sec) samples and a decrease for the long-anneal (1.3 and 7.8 sec) samples. The trend was reversed when the 1.3-mil wires were roll flattened to tapes such that the direction of flow was perpendicular to the wire axis. X-ray studies indicated a strong 〈111〉 fiber texture in the cold-drawn wire and a 〈100〉+〈111〉 double texture after annealing, the ratio of 〈100〉 to 〈111〉 intensity increasing with annealing time. The tapes contained (100)[001] and (11̄0)[111]6° texture components, the intensities of which were related, respectively, to those of 〈100〉 and 〈111〉 components in the original wire. Thus it appears that drawing of a 〈111〉 wire led to increased squareness, in contrast to the 〈100〉 case; the reverse behavior, however, was exhibited in tapes roll flattened from wires of these two textures. These results were discussed in terms of the ``slip-induced directional order'' theory of Chikazumi et al.

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