Investigation of the Dynamics of Deformation Mechanisms in Mg-Gd Alloys Using In-situ Experimental Methods
Abstrakt
The dynamics of deformation mechanisms activated in binary magnesium-gadolinium alloys with respect to amount of Gd was investigated with in-situ experimental methods. Cast alloys were characterized by random texture.
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. The results clearly indicate that the twin propagation rate is of order of 101 m/s and it slows down with increasing Gd concentration Deformation tests were repeated in a chamber of scanning electron microscope (in-situ SEM) with concurrent following the microstructure development using secondary electrons and electron back-scattered diffraction (EBSD) in different stages of the deformation.
Main goal of this measurements was to identify active slip systems and the progress of twin volume fraction during deformation.