Abstract
The high strain rate deformation behaviour and dislocation substructure of AZ80 magnesium alloy are investigated at strain rates of 8x102 s-1, 1.5x103 s-1 and 2.2x103 s-1 and temperatures of-100 ºC, 25 ºC and 300 ºC using a compressive split-Hopkinson pressure bar system. The flow stress, work hardening coefficient, strain rate sensitivity and temperature sensitivity all increase with increasing strain rate or decreasing temperature. Moreover, the dynamic deformation behaviour is well described by the Zerilli-Armstrong hcp constitutive equation. Transmission electron microscopy observations show that the dislocation density increases with a higher strain rate or a lower temperature. Finally, the flow stress varies linearly with the square root of the dislocation density in accordance with the Bailey-Hirsch model.
Highlights
Magnesium alloys have many favourable properties, including a low density, a high strength-to-weight ratio, excellent machinability, and good recyclability
The present study investigates the high strain rate deformation behaviour of AZ80 magnesium alloy at strain rates of 8x102 s-1, 1.5 x103 s-1 and 2.2x103 s-1 and temperatures of -100 oC, 25 oC and 300 oC using a compressive split-Hopkinson pressure bar (SHPB) system
The impact deformation behaviour of AZ80 magnesium alloy have been investigated at strain rates ranging from 8x102 s-1 to 2.2x103 s-1 and temperatures of -100 oC, 25 oC and 300 oC using a compressive split-Hopkinson pressure bar (SHPB) system
Summary
Magnesium alloys have many favourable properties, including a low density, a high strength-to-weight ratio, excellent machinability, and good recyclability. As a result, they have received extensive attention in recent years as structural components for transportation and aerospace applications, and lightweight enclosures for 3C (computer, communication and consumer electronic) products [1,2]. To ensure the physical integrity of AZ80 structural components, a more rigorous evaluation of the effects of strain rate and temperature on the flow behaviour and dislocation substructure of AZ80 magnesium alloy is required. The present study investigates the high strain rate deformation behaviour of AZ80 magnesium alloy at strain rates of 8x102 s-1, 1.5 x103 s-1 and 2.2x103 s-1 and temperatures of -100 oC, 25 oC and 300 oC using a compressive split-Hopkinson pressure bar (SHPB) system. The correlation between the flow stress and the dislocation density is investigated as a function of the strain rate and temperature
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