• Moszczyńska, Dorota
• Osiak, Bartosz
• Lipiec, Radosław
• Kulczyk, Mariusz
• Mizera, Jarosław
• Adamczyk-Cieślak, Bogusława

Abstract

A 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.

Topics

• impedance spectroscopy
• single crystal
• grain
• grain size
• x-ray diffraction
• aluminium
• transmission electron microscopy
• texture
• electron backscatter diffraction
• hydrostatic extrusion