Abstract
A series of Al-5Ti-1B master alloys were obtained via fluoride salt process by holding them between 780°C and 880°C for
10-90 min. The influence of holding temperature and time during preparation on the microstructure and its refining performance
were investigated by X-ray diffractometer, optical microscopy and scanning electron microscopy equ ipped with energy dispersive
X-ray spectroscopy. The results indicated both the morphology and the distribution of TiB2 and Al3Ti were seriously affected by
holding conditions. Inadequate TiB2 particles were generated when holding time was short. However, Fe-containing impurity particles
that aggregated along the matrix grain boundaries were found after the prolonged holding time. The refining and microhardness
test results revealed that Al -5Ti-1B, the one held at 820°C for 30 min showed the optimum refining efficiency on Al-Cu alloy.
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