The Effect of the Low-Temperature Annealing upon the Fibrous Structures of Highly Cold-Worked Copper
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概要
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The fibrous structures developed in copper, cold-drawn as highly as 80 per cent or more, were investigated by X-ray analysis, especially by accurate measurement of the fibrous degree J (220)/J (113) on the microphotometric curves which was defined as a unit indicating preferential orientations in copper due to cold-drawing. The most outstanding result was that in the central portion of the wire, the fibrousness has increased a little more than the cold-worked state due to the annealing at 60℃ for 1 hour after cold-working. The author considered that this change means a little increase of fibrousness in [111]-orientation rather than in [100]-orientation and subsequently causes, at a higher temperature, somewhat intense crystal reorientation from [111] to [100]. On the other hand, the author has found a little but clear increase of tensile properties in highly cold-worked copper due to the annealing at 75〜165℃ after cold-working. These changes in copper were concluded to be attributed most probably to the crystal hardening or strengthening resulting from such crystal, reorientation as mentioned above.
- 東北大学の論文
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