0.3%TiN nanoparticles reinforced Al-Cu-Mn composites were prepared by ultrasonic assisted mechanical stirring

and microstructure and mechanical properties of the composites were investigated. The results reveal that the grain size of the metal matrix is significantly refined from 182.74 μm to 69.61 μm

and the microstructure become equiaxed structure. Meanwhile

the average size of nanoparticles agglomeration is decreased from 197.08 nm to 173.92 nm. The yield strength

tensile strength

elongation and hardness of prepared Al-Cu-Mn composites are increased by 16.73%

14.99%

58.81% and 11.68%

respectively

indicating that the comprehensive mechanical properties of Al-Cu-Mn composites are improved. The tensile fracture of TiN nanoparticles reinforced Al-Cu-Mn is characterized by quasi-cleavage

where river patterns are increased obviously

and large amounts of dimples formed by the exfoliation of TiN nanoparticles are evenly distributed.