Internal-friction and electron microscopy studies of cold-worked single-crystal and polycrystalline titanium

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Abstract
The internal friction of cold-worked titanium has been investigated using polycrystalline and single-crystal specimens. Despite the difference in dislocation substructures, namely, in single crystals all the dislocations are of ⅓ 〈1120〉 type whereas in polycrystals both ⅓ 〈1120〉 and ⅓ 〈1123〉 dislocations are present, the shapes of the internal-friction peaks are similar to each other. The whole spectrum observed in the temperature range from 100 to 200 K (at 1 Hz) should be attributed to ⅓ 〈1120〉 dislocations. The broadness of the peak is interpreted tentatively as arising from a diversity of relaxation parameters dependent on the character of the dislocation.