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采用电阻炉对用电磁搅拌方法制备的半固态ＡｌＳｉ１７Ｍｇ合金二次加热，结合金相分析研究了半固态组织的转变机制．实验发现，共晶相中的Ｓｉ相通过向 相中扩散溶解，其形状从片层状断裂成点链状颗粒，并随着温度升高颗粒细化球化，片层越薄。这一过程发生的温度越低，速度越快。Ｓｉ溶解到一定程度后共晶部分熔化，初生 相形状、尺寸开始变化，树枝状 相和蔷薇花状 相球化，但前者变大，后者变小为原始尺寸的１／２－１／４．近球形初生 相有长大趋势
The semi-solid AlSi17Mg alloy prepared by electromagnetic stirring method was reheated by resistance furnace, and the transformation mechanism of semi-solid microstructure was studied by metallographic analysis. It was found that the Si phase in the eutectic phase was diffused and dissolved into the phase, and the shape of the Si phase in the eutectic phase was broken from the lamellar to the chain-like particles, and the particles became thin and spheroidized as the temperature increased. The lower the temperature that occurs in this process, the faster it will be. After the Si dissolves to a certain extent, the eutectic part melts, and the shape and size of the nascent phase begin to change. The dendritic phase and the rose-like phase are spheroidized, but the former becomes larger and the latter becomes smaller to 1 / 2-1 / 4 of the original size . Nearly spherical nascent growth trend