Fabrication of in situ Al3Ti/Al composites by using ultrasound assisted direct reaction between solid Ti powders and liquid Al

A developed approach for fabricating in situ Al3Ti/Al composites via ultrasound assisted direct reaction between solid Ti powers and liquid Al at 780 °C was proposed in this research. In situ formed Al3Ti particles were blocky in morphology, and the size of most Al3Ti particles was in the range of 2–7 μm. The effects of ultrasonic vibration on the microstructure and fabricating process of in situ Al3Ti/Al composites were also discussed by comparing the ultrasonic treated sample and the contrast sample without ultrasonic treatment. In addition, a reaction-peeling model was suggested to explain the formation mechanism of small blocky Al3Ti particles.