Mg-AZ91E/TiCp composite was fabricated using a spontaneous infiltration technique at 950 degrees C under an argon atmosphere. The composites produced have 37 vol.% of metal matrix and 63 vol.% of TiC-like reinforcement. The obtained composites were subsequently solution heat-treated at 413 degrees C during 24h, cold water quenched, and subsequently artificially aged at 168 and 216 degrees C during 16h in an argon atmosphere. Effect of heat treatment on the microstructure and mechanical properties was evaluated. Microstructural characterization was analyzed using different techniques such as X-ray diffraction (XRD) and scanning electron microscopy (SEM). Interface between matrix and reinforcement was examined using transmission electron microscopy (TEM), and mechanical properties were evaluated by measuring the elastic modulus and hardness. Mg, TiC, Al, and Mg17Al12 phases through XRD were detected. Meanwhile, using TEM analysis in heat-treated composites MgAl2O4, MgO, and Al2O3 were identified. The as-fabricated composite have elastic modulus and hardness of 162GPa and 316Hv, respectively. After solution heat treatment and aging at 168 degrees C during 12h, the composites reaches values of 178GPa and 362Hv for the elastic modulus and hardness, respectively. Time of aging was correlated with measures of elastic modulus and hardness.