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The effect of the liquid-liquid structure transition(L-LST) on the solidification behaviors and morphologies of Sn-Bi alloys was studied further. The results show that the undercooling of the primary and eutectic phase increases and the microstructure becomes finer after solidifying from the melt experiencing the L-LST. In the meantime, in hypoeutectic alloy, when solidifying from the melt experiencing the L-LST, the morphology of primary phase changes from the fir-tree crystal into the equiaxed crystal, and less primary phase and more eutectic structure are observed. Moreover, in eutectic alloy, the spacing of eutectic phase decreases markedly. These investigations would be beneficial to further exploration of the correlation between the melt structure and the micro mechanism of solidification. 相似文献
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结合强制冷却方法研究了 Sn-30Sb合金在温度诱导液相结构转变前后熔体的凝固行为及其组织的变化.结果表明,在液相结构转变后保温处理的熔体,相对于在液相结构转变前保温时,其凝固时所需过冷度增大,SnSb化合物明显细化,分布弥散化.分析认为,由于在升温至876~1 135 ℃范围时熔体液相结构发生转变,导致熔体中类固型原子团簇被大量打破,熔体结构趋于均匀和无序,抑制了初生相的形核、生长,进而有利于包晶转变的进行,使得凝固组织变化明显. 相似文献
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