In Situ Neutron Diffraction Studies of the Pseudoelastic-Like Behaviour of Hydrostatically Extruded Mg-Al-Zn Alloy

Ondrej Muránsky; David G. Carr; Petr Sittner; E.C. Oliver; P. Dobroň

doi:10.4028/www.scientific.net/MSF.571-572.107

Paper Titles

Instrumented Indentation Testing on Uniaxially Prestressed Steel Samples
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In Situ Analysis of Deformation Mechanisms of Cu-Based fcc Materials under Uniaxial Loading
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Evaluation of the Residual Stresses and Determination of the Proportion of Residual Austenite in an Austempered Ductile Iron Having Undergone Thermo Mechanical Treatments
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Temperature Dependence of Residual Stress Gradients in Shot-Peened Steel Coated with CrN
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In Situ Neutron Diffraction Studies of the Pseudoelastic-Like Behaviour of Hydrostatically Extruded Mg-Al-Zn Alloy
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A Study of Residual Elastic Strain Distribution in an AZ91 Mg Alloy Bar Loaded in Four Point Bending
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Investigation of the Stress Fields Around a Fatigue Crack in Aluminium Alloy 5091
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Study of Elasto-Plastic Anisotropic Response of Stainless Steel Weld Metal Using Neutron Diffraction
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Neutron Diffraction Analysis of Stresses in an In-Plane Biaxially-Fatigued Stainless Steel Sample of Cruciform Geometry
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In Situ Neutron Diffraction Studies of the Pseudoelastic-Like Behaviour of Hydrostatically Extruded Mg-Al-Zn Alloy

Abstract:

In-situ neutron diffraction has been used to study the pseudoelastic-like behaviour of hydrostatically extruded AZ31 magnesium alloy during stress-strain cycles in compression and tension along the extrusion direction. It has been confirmed that the activation of reversal twinning processes during unloading is responsible for the macroscopically observed hysteresis effect. Moreover, neutron diffraction data reveals the existence of high tensile stresses in grains which have just experienced significant twinning activity prior to the start of the unload cycle. It is thus proposed that this tensile stresses provides the necessary driving force for the activation of untwinning in already twinned grains.