한국주조공학회

Titanium-Boron-Aluminium master alloys are used extensively to grain-refine a wide range of aluminium alloys. This experiment was performed by various amounts of AlTi5B1 addition to the technical aluminium alloys, and also by changing cast temperature and hold time of the melts. The macrostructures were shown that with increasing the addition of AlTi5B1 to the melts, the grain became finer. In the case of cast temperature high enough over 900℃, the grain became coarser, but hold time change not affected on the grain refinement. Particles of TiAl_3, and TiB_2 were found in the grains and grainboundaries. The important role of grain refinement in this experiment were mainly TiAl_3, and also TiB_2 those have been confirmed in TEM, SEM, EDS, WDX and X-ray diffraction.