|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||X-11: Detailed microstructure investigation of LAE442 magnesium alloy processed by EX-ECAP
||Klaudia Horváth, Jitka Stráská, Peter Minárik, Robert Král, Josef Pešička, Stanislav Daniš
|On-Site Speaker (Planned)
The magnesium alloy LAE442 was processed by extrusion and equal channel angular pressing (EX-ECAP) to achieve ultrafine grained microstructure. Detailed characterization of the microstructure was performed by scanning electron microscope, electron back scatter diffraction (EBSD) and transmission electron microscope. The initial, as-cast, microstructure consisted of large grains of ~1mm. The grain refinement due to the processing by severe plastic deformation led to a decrease of the average grain size to ~1.7 µm after the final step of ECAP. A detailed characterization of secondary phases showed the precipitation of Al11RE3, Al2Ca and Al10RE2Mn7 intermetallic phases. X-ray diffraction measurements proved that Li is dissolved within the magnesium matrix in the as-cast condition. Newly formed Al3Li phase was observed after ECAP. The texture formation due to the EX-ECAP was different from that in the other magnesium alloys due to the activation of non-basal slip systems as a result of the decrease of the c/a ratio.