Content area
Abstract
In-situ blocky Al^sub 3^Ti particles can be synthesized by direct reaction between solid Ti powders and liquid Al in terms of reaction-peeling model. In this research, the effect of high-intensity ultrasonic vibration on the reaction was investigated by means of immersing the ultrasonic radiator in the Al melt at 1003 K (730 °C) during the fabricating process. The results show that the thickness of Al^sub 3^Ti reaction layers can be decreased to range from 2 to 3 [mu]m, and the sizes of most of Al^sub 3^Ti particles can be reduced in the ultrasonic fields as well, with the average size ranging from 2 to 3 [mu]m. The two changes are both attributed to the effects of external forces produced in the ultrasonic fields. Thereby, small blocky Al^sub 3^Ti particles can be peeled off from the reaction layer more quickly, making reaction layers to become thinner and the particles smaller.[PUBLICATION ABSTRACT]