· Aleaciones ligeras ·
Min Ryou*, Sang-Ho Choi** and Myung-Ho Kim *
* Inha University, South Korea ** Dongyang Junior Technical College
67th World Foundry Congress
The effect of process parameters, such as reaction temperature and
holding time, on the microstructure of Al-Ti-B master alloy had been
studied by using SEM/EDS and EPMA. The flux reactions between K2TiF6,
KBF4 and molten aluminum were carried out at various temperatures and
holding times. The results indicated that the morphology of TiAl3 particles
in master alloy was strongly influenced by reaction temperature and
holding time. The TiAl3 particles with blocky type which was known as an
effective refiner were observed at lower reaction temperature and in
shorter holding time, whereas finer TiB2 particles were found to be
distributed uniformly independent of the reaction temperatures. The size
of TiAl3 particles in the master alloy was significantly increased with
increasing of the reaction temperature, and the increased temperature
resulted in the change of the morphology of TiAl3 particles from blocky to
plate-like type. The TiAl3 particles with morphology of blocky type shows
longer fading time compare to the plate-like type.
