Abstract
The detail investigation of the flow stop data is necessary to reveal the flow stop mechanism. In this study, the fluidity of ADC12 alloy was investigated by using the vertical suction type test apparatus. Molten metal was sucked into test section (rectangular channel dies) under carefully controlled conditions. The influence of mold temperature on fluidity length was examined. Test results showed that the fluidity length decreased with increase of the mold temperature. The difference between was also decreased with increase of the mold temperature. The contact area of the molten metal and the mold was increased with increase of the mold temperature. When the mold temperature was low, the dendrite micro structure around the surface of shrinkage part was coarsened. The time taken for flow stoppage saturated at elevated mold temperature. According to mold temperature increases, the average velocity of molten metal was decreased due to decrement of fluidity length and increment of the time taken for flow stoppage.
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