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 |