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

摘要

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 urn. 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.