X-ray Topographic Studies on the Lüders Band Propagation and the Dislocation Motion in Copper Whisker Crystals

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Abstract
Dislocations in plastically deformed blade-like [110] copper whisker crystals with thickness of 20 to 70 µ are studied by means of X-ray transmission topograpay. Topographs are taken under the application of tensile stress. Dislocations with a semi-circular shape are always observed to spread over a long distance more than 100 µ in front of the Lüders band, and they are shown to become cross-slipped and double cross-slipped dislocations. The Lüders band can propagate according to the double cross slip mechanism. This may be true for the cases of [001] and [111] copper whisker crystals. Concaves on the crystal edge are the effective sites for dislocation sources. The dislocation motion is not steady and the dislocation pinning due to impurities may be responsible for the irregular dislocation motion. Results obtained indicate that the coarse copper whisker crystals are useful for the studies on the plastic deformation.

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