SINGLE crystals up to 20 mm. × 2.5 mm. × 1 mm. have been prepared in pure titanium by a modified strain anneal technique. Pure titanium of hardness of 90 V.P.N., indicating 0.01 wt. per cent of oxygen plus nitrogen1, prepared in this laboratory by the van Arkel process, was first arc-melted2 and then cold-rolled with intermediate annealing at 860° C. to strip in which there was very little preferred texture. By suitably gettering the purified argon used as a protective atmosphere throughout this preparation, the hardness of the titanium was not increased. The grain-size of this strip was fairly coarse and uneven (1–25 grains/mm.2). Tensile strains from 0.05 to 5 per cent did not give large crystals on annealing for 90 hr. at 860° C.; but compressive strains between 0.1 and 1 per cent, followed by similar annealing, produced in one-third of the specimens a crystal occupying the whole cross-section and an appreciable part of the gauge length, as illustrated.
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CHURCHMAN, A. Preparation of Single Crystals of Titanium and their Mode of Deformation. Nature 171, 706 (1953). https://doi.org/10.1038/171706a0
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