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| UNUSUAL DISLOCATION SUBSTRUCTURES IN Zr BY HYDROSTATIC EXTRUSION |
| LIN Yijian; LIU Ansheng; SANG jimei (General Research Institute of Non-ferrous Metals; Beijing); KE Jun (Beijing University of Iron and Steel Technology) |
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Cite this article:
LIN Yijian; LIU Ansheng; SANG jimei (General Research Institute of Non-ferrous Metals; Beijing); KE Jun (Beijing University of Iron and Steel Technology). UNUSUAL DISLOCATION SUBSTRUCTURES IN Zr BY HYDROSTATIC EXTRUSION. Acta Metall Sin, 1986, 22(2): 21-145.
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Abstract A TEM study was made of the dislocation substructures in Zr extruded under a high hydrostatic pressure. It was found in 10% extruded Zr that the dislocations densely assembled in certain regions on the primary active slip planes with a configuration of complicate tangling in two dimensions. Only after 30% extrusion, the cell-subgrains in a laminar structure with distinct interfaces appeared as a result of the development of special mentioned dislocation configuration. After heavily extruded under 12000 atm, the subgrains of less than 0.5μm width and apparent misorientation became extensive, which could be crystallographically divided into two types. The first is the developed subgrains parallel to (1010), occurring previously in earlier stage of deformation, the other, being more in quantity and thinner than the former, has the interfaces lying on the basal plane with typical twisting misorientation. The mentioned substructures have not been seen in conventionally drawn Zr used for comparison. Its formation can be interpreted from the point of view of the effect of high hydrostatic pressure on the thermal activation movement of dislocations.
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Received: 18 February 1986
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