|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Magnesium Technology 2017
||I-27: Damage and Fracture in Magnesium AZ31, Experiments and Modeling
||Babak Kondori, Ahmed Amine Benzerga
|On-Site Speaker (Planned)
The microscopic damage mechanisms operating in a hot-rolled AZ31B are investigated under uniaxial and controlled triaxial loadings. The fracture locus exhibits a maximum at moderate triaxiality and the strain-to-failure is found to be greater in notched specimens than in initially smooth ones. A micromechanics-based continuum damage model with a Gurson-like void growth yield criterion for porous materials and a fully analytical shape-dependent void/crack coalescence part is used to rationalize the main findings. Based on image analysis data from broken specimens, only the second phase particles are considered as void nucleation sites in notched bars. Using only one fitting parameter, the predicted fracture strains qualitatively capture the experimental trends. The analysis suggests that the ductile fracture of magnesium alloy AZ31 involves limited void opening/blunting and is controlled by void coalescence. The results provide the groundwork for understanding the effects of microstructural and loading variables on damage and fracture in Mg alloys.