The researchers studied how a special type of aluminum alloy and a composite material made from this alloy with added particles behaved under repeated stress. They found that the composite material was stiffer but weaker and less flexible than the alloy alone. The presence of large particles in the composite led to fractures, and the bond between the particles and the alloy was not strong. The alloy's fatigue life was affected by the level of stress, while the composite had shorter fatigue life at lower and medium stresses compared to the alloy. The results show that the composite material did not have the expected strength for this type of material.