Thermally Activated Dislocation Motion in an AS21 Alloy and Alloy Reinforced with Short Ceramic Fibres Studied at Elevated Temperatures

Zuzana Zdražilová; Zuzanka Trojanová; Kristián Máthis; Pavel Lukáč

doi:10.4028/www.scientific.net/KEM.592-593.71

Paper Titles

Structural Transformation in Nanowires CuAu I with Superstructure of L10 of Tetragonal Symmetry at Uni-Axial Tension Deformation
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Structural Response of Metal Crystallite with BCC Lattice on Atomic Level under Nanoindentation
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Comparison between Pile-Up Singularities and Stress Fields Induced by Thin Slip Bands. Application to the Prediction of Grain Boundary Microcrack Nucleation
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Planar Defects and Dislocations in C40 and FCC Lattices
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Thermally Activated Dislocation Motion in an AS21 Alloy and Alloy Reinforced with Short Ceramic Fibres Studied at Elevated Temperatures
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Deformation and Fracture of a Magnesium Alloy at Elevated Temperatures
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Thermodynamics of Dislocation Pattern Formation at the Mesoscale
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Modeling and Experimental Study of Long Term Creep Damage in Austenitic Stainless Steels
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3D Discrete Dislocation Dynamics Applied to a Motion of Low-Angle Tilt Boundaries
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Thermally Activated Dislocation Motion in an AS21 Alloy and Alloy Reinforced with Short Ceramic Fibres Studied at Elevated Temperatures

Abstract:

AS21 magnesium alloy (2.1Al-1Si-balance Mg in wt.%) and the alloy reinforced with short δ-Al₂O₃ fibres (Saffil^®) were deformed in compression at temperatures between 23 and 300 °C. Stress relaxation tests were performed in order to reveal features of the thermally activated dislocation motion. Internal and effective components of the applied stress have been estimated. The activation volume decreases with increasing effective stress. The values of the activation volume and the activation enthalpy indicate that the main thermally activated process in the alloy as well as in the composite is the dislocation motion in non-compact planes.