Quantitative investigation on the deformation modes and cracking
behavior during cyclic torsional loading of extruded pure Mg and Mg-3Y
alloy
Abstract
This study explores the effect of adding 3wt.% Y to pure magnesium (Mg)
on its mechanical behavior under cyclic torsional loadings at room
temperature. The research examines deformation and cracking modes in
both pure Mg and Mg-3Y samples. Deformation modes are monitored using
quasi-in-situ EBSD observations coupled with slip trace analysis. The
findings reveal that basal slip dominates the cyclic deformation
throughout the fatigue life of the pure Mg sample, while both basal and
pyramidal slip dominate the cyclic deformation in the Mg-3Y sample.
Intergranular cracking is the primary cracking mode for both samples
under cyclic torsional loadings. Basal and pyramidal slip PSB cracking
serves as a primary transgranular cracking mode in the pure Mg and Mg-3Y
samples, respectively. The study also investigates the underlying
mechanism governing the activity of various deformation modes, cracking
modes, and mechanical behavior.