The Evolution of Solid Powders in Liquid Aluminum at Low Temperature and the Effects of Ultrasound on It
This research investigated the evolution of solid Ti powders in liquid Al at low melting temperature of 730 °C. In situ Al3Ti particles were synthesized due to the reactive diffusion between solid Ti powders and liquid Al. These Al3Ti particles were blocky in morphology and smaller than 5 µm in size. It was found that the formation of Al3Ti particles underwent the processes of nucleation, growth and rupture. Accordingly, a reaction-peeling model was suggested to illustrate the formation mechanism of small blocky Al3Ti particles. In addition, the effects of high-intensity ultrasound on the diffusion reaction between solid Ti powders and liquid Al were studied. Ultrasonic fields in the Al melt could generate instantaneous high pressure and interparticle collisions, both of which could accelerate the formation rate of Al3Ti particles significantly. An ultrasound assisted in situ method was proposed for producing in situ Al3Ti/Al composites in this research.
KeywordsAl3Ti particles Ultrasound Aluminum composites
Unable to display preview. Download preview PDF.
- T.J. Chen, J. Li, H. Yuan, “Casting Fabrication of In Situ Al3Ti-Al Composites and Their Wear Behaviors,” China Foundry, 6 (2009), 319–327.Google Scholar
- W.Q. Jie, E.G. Kandalova, R.J. Zhang, V.I. Nikitin, “Al3Ti/Al Composites Prepared by SHS,” Rare Metal Materials and Engineering, 29 (2000), 145–148.Google Scholar
- K.S. Suslick, Ultrasound: Its Chemical, Physical, and Biological Effects (New York, NY: Wiley-VCH, 1998).Google Scholar