Development of texture and microstructure in extruded ionic polycrystalline aggregates |
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| Authors: | W Skrotzki P Welch |
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| Institution: | 1. Institut für Metallphysik, Universität Göttingen, GöttingenF.R. of Germany;2. Institut für Metallkunde, Technische Universität Clausthal, Clausthal-ZellerfeldF.R. of Germany |
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| Abstract: | The crystallographic preferred orientation (here referred to as texture) developed in extruded ionic polycrystalline aggregates with the NaCl-structure is studied as a function of extrusion temperature and ionicity of the material. In pure alkali halides and silver chloride a 100111 double fibre texture is found for all extrusion temperatures investigated. In extruded natural rock salt the 100 fibre is replaced by 115 at or below room temperature. The temperature dependence of the intensity of preferred orientation together with microstructural investigations suggest the 100 and 115 components to be primarily due to dynamic recrystallization. The 111 deformation texture agrees with model calculations based on simultaneous slip on both the {110}110 and {100}110 slip systems, generally observed as primary and secondary slip systems in NaCl-type ionic crystals, respectively. Possible applications to the study of the diapirism of salt domes are discussed. |
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