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HIGH STRAIN RATE BEHAVIOUR OF AN AZ31 + 0.5 Ca MAGNESIUM ALLOY

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Author(s): Zuzanka Trojanová | Pavel Lukáč | Tomáš Podrábský | Josef Pešička

Journal: Materials Engineering
ISSN 1335-0803

Volume: 19;
Issue: 1;
Start page: 12;
Date: 2012;
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Keywords: Mechanical Properties | Magnesium Alloy | High Strain Rates | Dislocations | Mechanical Twins

ABSTRACT
The paper reports behaviour of magnesium alloy AZ31 (nominal composition 3 % Al - 1 % Zn – balance Mg) with an addition of 0.5 wt. % Ca at high strain rates. Samples were prepared by the squeeze cast technology. Dynamic compression Hopkinson tests were performed at room temperature with impact velocities ranging from 11.2 to 21.9 m.s-1. A rapid increase of the flow stress and the strain rate sensitivity was observed at high strain rates. Transmission electron microscopy showed extremely high dislocation density and mechanical twins of two types. Adiabatic shear banding is discussed as the reason for the observed behaviour at high strain rates.

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