Interface Dislocations and Glide Dislocations on θ' Precipitates in an Al-4% Cu Alloy

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概要

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• Thin foils of Al-4 per cent Cu alloy containing platelets of θ' precipitate were prepared by electrolytic thinning technique and appearances of θ' precipitates parallel to the surface of foils were examined under different diffraction conditions with a transmission electron microscope. Examining the contrast of interface of θ' precipitates in undeformed specimens, it was confirmed that some interface dislocations with a Burgers vector of [001]_<θ'> direction were present at the periphery of the coherent interface of θ' precipitates. Also, a grid of interface dislocations was observed in the whole interface in some lens-shaped precipitates. In deformed specimens, numerous dislocations were observed to adhere to θ' precipitates perpendicular to the foil surface and striations appeared on precipitates parallel to the foil surface. These striations were attributed either to dislocation images or to moire pattern. In either case it was concluded that they were related to the distribution of dislocations on the interface of θ' precipitates, and that the characteristic of most of the dislocations was not of pure screw but of mixed type, as expected from the slip model of θ' precipitates proposed by the present authors. A relation between dislocation array and moire pattern was discussed and it was suggested that the striations might appear only as moire pattern if the spacing between neigh-bouring dislocations was smaller than the width of dislocation images.

• 東北大学の論文

著者

• Koda Shigeyasu

  The Research Institute For Iron Steel And Other Metals

• Matsuura Keisuke

  The Research Institute For Iron Steel And Other Metals

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