The Effect of Twinning on Strain Rate Sensitivity during the Compression of Extruded Magnesium Alloy AZ31

Chris H.J. Davies

doi:10.4028/www.scientific.net/MSF.539-543.1723

Paper Titles

Development of a High Strength Mg-Zn-Y-Zr Wrought Alloy
p.1701

Influence of Misch Metal Addition and Deformation Processes on Microstructure and Mechanical Properties in AZ61 Alloy
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Texture Evolution during Uniaxial Compression of Hot-Rolled AZ31 Mg Alloy
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Investigation and Application of Excellent Performance Mg Rare Earth Alloys as a Structural Material
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The Effect of Twinning on Strain Rate Sensitivity during the Compression of Extruded Magnesium Alloy AZ31
p.1723

Effect of Solidification Grain Refinement on the Development of Wrought Mg Alloys
p.1729

Evolution of Microstructures during Laser Surface Cladding of Magnesium Alloy Castings Using Welding Wire
p.1735

Linking Meso- and Macroscale Simulations: Crystal Plasticity of hcp Metals and Plastic Potentials
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Microstructure and Mechanical Properties of Mg Alloy Sheets Produced by Twin Roll Caster
p.1747

HomeMaterials Science ForumMaterials Science Forum Vols. 539-543The Effect of Twinning on Strain Rate Sensitivity...

The Effect of Twinning on Strain Rate Sensitivity during the Compression of Extruded Magnesium Alloy AZ31

Abstract:

Samples of extruded magnesium alloy AZ31 (nominally 3 wt% Al, 1 wt% Zn, 0.3 wt% Mn, with the balance magnesium) were tested in uniaxial compression at temperatures from room temperature to 200°C. Monotonic and strain rate jump tests were conducted, and strain rate sensitivity, and activation volume were determined. At the lower temperatures tested, strain rate sensitivity was found to increase with strain to a limiting value, whereas at 200°C strain rate sensitivity initially followed a similar trend, but did not reach a limit within the bounds of the test. The effect of temperature on strain rate sensitivity was minor up to 150°C. Activation volume decreased with stress by roughly an order of magnitude over the course of the tests. An analytical model was modified to incorporate strain rate sensitivity, and it is shown that the evolution of material by twinning into an orientation favourable for slip is principally responsible for the trend in strain rate sensitivity with increasing strain.