摘要
Microstructural evolution and mechanical properties of in situ TiB2/A1 composites fabricated with exothermic reaction process under high-intensity ultra- sound produced by the magnetostrictive transducer were investigated. In this method, the microstructure and grain refining performance of the TiB2/A1 composites were characterized by optical morphology （OM）, scanning electron microscopy （SEM）, energy-dispersive spec- trometer （EDS）, and X-ray diffraction （XRD） analysis. Microstructural observations show a decreasing trend in the grain size of the composites due to the ultrasound and the content of TiB2 particles in the composites. Compared with the process without ultrasound, the morphology and ag- glomeration of TiB2 particles are improved by high-in- tensity ultrasound. Meanwhile, it is proposed that the formation of TiBz particles occurs via the transformation from TiA13, and at the optimal amount of the reactants, the conversion efficiency of TiA13 into TiB2 almost reaches up to 100 %. Finally, the effects of high-intensity ultrasound and TiB2 particles on the mechanical properties of the TiB2/A1 composites were also discussed.
Microstructural evolution and mechanical properties of in situ TiB2/A1 composites fabricated with exothermic reaction process under high-intensity ultra- sound produced by the magnetostrictive transducer were investigated. In this method, the microstructure and grain refining performance of the TiB2/A1 composites were characterized by optical morphology （OM）, scanning electron microscopy （SEM）, energy-dispersive spec- trometer （EDS）, and X-ray diffraction （XRD） analysis. Microstructural observations show a decreasing trend in the grain size of the composites due to the ultrasound and the content of TiB2 particles in the composites. Compared with the process without ultrasound, the morphology and ag- glomeration of TiB2 particles are improved by high-in- tensity ultrasound. Meanwhile, it is proposed that the formation of TiBz particles occurs via the transformation from TiA13, and at the optimal amount of the reactants, the conversion efficiency of TiA13 into TiB2 almost reaches up to 100 %. Finally, the effects of high-intensity ultrasound and TiB2 particles on the mechanical properties of the TiB2/A1 composites were also discussed.
基金
financially supported by the National High Technology Research and Development Program of China(No.2013AA031104)
