Abstract
The textured 10%volTi2AlC reinforced AZ91D magnesium composite's cross section in parallel (//ED) and perpendicular (⊥ ED) to extruded axis was investigated, compared with the textured AZ91D and as-cast 10%volTi2AlC -AZ91D composite. With the introduction of Ti2AlC particles, the micro-sized Mg17Al12 precipitates previously found in extruded AZ91D became nano-sized and dispersed in composite. This change stimulated the Orowan strengthening effect in yield strength. As Ti2AlC particles were reoriented after hot extrusion, tensile and compressive tests provide evidence of stronger anisotropy in textured composite than the textured AZ91D alloy. At the same time, the different fracture mechanisms were proposed. Furthermore, the changes in slope of the resistivity with temperature (dρ/dT) and electrical resistivity ratio R293K/R77K (RRR) between //ED and ⊥ ED specimens confirm Ti2AlC do contribute in the AZ91 alloy to the scattering of the conductive free electrons.
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