Microstructure and texture development in a polycrystal and different aluminium single crystals subjected to hydrostatic extrusion
Dorota Moszczyńska , Bogusława Adamczyk-Cieślak , Bartosz Osiak , Radosław Lipiec , Mariusz Kulczyk , Jarosław Mizera
AbstractA hydrostatic extrusion (HE) process was applied to commercial pure polycrystalline aluminium (99.9%) and two aluminium single crystals <111> and <110>. On comparison, the results obtained from single crystals and polycrystalline aggregates are unique. Microstructure and crystallographic texture investigations were performed by transmission electron microscopy, electron backscatter diffraction and X-ray diffraction (XRD). Significant differences in grain refinement and texture formation were noticed depending on the starting orientation. The deformed single crystal with <110> starting orientation features an average grain size value of 150% higher than the second investigated single crystal (0.5 μm for the <111> single crystal and 1.3 μm for the second crystal). In turn, the average grain size obtained for polycrystalline aluminium is 0.9 μm. The deformation process causes a difference in the grain sizes, while a fraction of the high angle grain boundaries have a comparable volume percentage in all the deformed microstructures—reached about 35%. The qualitative and quantitative XRD texture results proved that the HE process leads to the formation of a characteristic fibrous texture.
|Journal series||Bulletin of Materials Science, ISSN 0250-4707, (A 20 pkt)|
|Publication size in sheets||0.5|
|Keywords in Polish||Tekstura odkształcenia, orientacja krystaliczna, monokryształ, dyfrakcja elektronów wstecznie rozproszonych, aluminium|
|Keywords in English||deformation texture, crystallographic orientation, single crystal, electron backscattering diffraction, aluminium|
|Score||= 20.0, 26-07-2019, ArticleFromJournal|
|Publication indicators||= 0; : 2017 = 0.524; : 2017 = 0.925 (2) - 2017=1.066 (5)|
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