Superplastic Behaviour of an Extruded AZ91 Alloy
Z. Trojanováa, T. Ryspaevb, P. Palčekc and M. Chalupovác
aDepartment of Physics of Materials, Faculty of Mathematics and Physics, Charles University, Prague, Ke Karlovu 5, CZ-121 16 Praha 2, Czech Republic
bInstitute of Welding Engineering and Cutting Manufacturing Processes (ISAF), Clausthal University of Technology, Agricola Str. 2, D-38678 Clausthal-Zellerfeld, Germany
cDepartment of Materials Engineering, Faculty of Mechanical Engineering, University of Žilina, Univerzitná 1, SK-010 26 Žilina, Slovak Republic
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Plastic deformation of extruded AZ91 magnesium alloy was investigated at various strain rates and in a temperature range of 360-420°C. Samples exhibiting superplastic behaviour were prepared with different thermo-mechanical treatments. Microstructure of samples was observed by light and scanning electron microscopy. The strain rate sensitivity parameter m has been estimated by the abrupt strain rate change method. Possible physical mechanisms of the superplastic flow are discussed.
DOI: 10.12693/APhysPolA.122.597
PACS numbers: 81.05.Bx, 62.20.fq