采用控制熔体结晶法制得颗粒状组织半固态ZL101合金,研究了结晶初期熔体流动对粒状初晶形成的作用.结果表明:粒状晶的形成除受浇铸温度影响外,还与熔体充型方式有关.常用的上铸充型可使初生α相粒化,而充型平稳的底铸所得组织仍以树枝晶为主.680℃浇铸后自然凝固组织为树枝状;相同条件下,在液相线温度附近对熔体施以极短时的搅动,便得到粒状α组织.数值模拟揭示了熔体充型及结晶初期温度和流速的变化,液相线温度附近的熔体流动是粒状晶形成的关键
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