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Superplastic Behaviour of an Extruded AZ91 Alloy

100%
Trojanová Z., Turba K., Száraz Z., Ryspaev T., Palček P., Chalupová M.
Acta Physica Polonica A
|
2012
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vol. 122
|
issue 3
597-600
EN
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.
2
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Superplastic Behaviour of an Mg-Ag-RE Magnesium Alloy

100%
Trojanová Z., Chiappa S., Málek P., Száraz Z., Lukáč P., Ryspaev T.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 4
765-767
EN
Fine-grained magnesium alloy QE22 (Mg-2.5wt.%Ag-2.5wt.%RE-0.6wt.%Zr) was prepared from cast ingot which was submitted to a two stages heat treatment. Subsequently the billet was overaged and extruded at high temperature. Samples were deformed at elevated temperatures from 380°C up to 480°C at various strain rates. Microstructure of deformed samples was studied using light and electron microscopy. Conditions for superplasticity of the investigated alloys have been estimated. Possible deformation mechanisms are discussed.
3
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Overall Model of Plasticity and Failure of Metals

80%
Zuev L.
Acta Physica Polonica A
|
2011
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vol. 120
|
issue 2
340-343
EN
Plastic flow evolution was investigated for various metals and alloys, which differed in chemical bond and crystal lattice type (BCC/FCC/HCP), structural state (single-crystal/polycrystalline) and deformation mechanisms (dislocation glide/twinning). On the base of conclusive evidence it is attempted to explain the phenomenon of plastic flow localization by invoking a fundamental principle of quantum mechanics.
4
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Activation Energy for Grain Growth of the Isochronally Annealed Ultrafine Grained Magnesium Alloy after Hot Extrusion and Equal-Channel Angular Pressing (EX-ECAP)

70%
Stráská J., Stráský J., Janeček M.
Acta Physica Polonica A
|
2015
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vol. 128
|
issue 4
578-581
EN
Magnesium alloy AZ31 prepared by hot extrusion and 4 passes of equal-channel angular pressing (EX-ECAP) has ultra-fine grained microstructure with an average grain size of 900 nm. Grain growth is analysed using a general equation for the grain growth and an Arrhenius equation. The calculated value of the activation energy for grain growth differs with the annealing temperature. The fitted value of activation energy for grain growth in the intermediate temperature range (210-400°C) is in accordance with the results of other authors, but it is shown in this study that such value is abnormally low and physically meaningless. More real values of apparent activation energy in this temperature range were calculated from the model assuming a linear increase of activation energy with increasing annealing temperature. Result of this linear model of evolution of activation energy in the temperature range between 210-400°C is expressed by the interval estimation of apparent activation energy values. It is concluded that the evolution of apparent activation energy can be explained by a change in the mechanism underlying the grain boundary migration. In the low temperature range, the grain boundary diffusion is dominant since the material is ultra-fine grained, whereas at higher temperatures, the lattice self-diffusion is more important.
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