The Influence of Gadolinium Concentration on the Dynamics of Deformation Mechanisms in Magnesium Alloys
Abstrakt
The dynamics of deformation mechanisms activated in binary Mg-Gd alloys with respect to amount of Gd was investigated with in-situ experimental methods. Compression test were done at room temperature with simultaneous record of acoustic emission response. The acoustic emission signal was subsequently analysed using advanced clustering method providing information about the dominant deformation mechanisms.
High speed camera was used to study the dynamics of twinning, including estimation of the velocity of twin propagation with respect to Gd concentration. Concurrent molecular dynamic simulations revealed that the presence of Gd enhances the formation of stacking faults, which hinder twin propagation as effectively as twin boundary pinning by Gd solutes.
Deformation tests were repeated in a chamber of scanning electron microscope with concurrent following the microstructure development using secondary electrons and electron back-scattered diffraction in different stages of the deformation. Main goal of this measurements was to identify active slip systems during deformation.