微重力偏晶合金凝固特征

MICROSTRUCTURAL FEATURE IN Al-In MONOTECTIC ALLOY PROCESSED UNDER MICROGRAVITY

对在微重力条件下获取的Al-In(95wt-%)偏晶合金的显微组织特征进行了分析,结果表明,在空间制取的试样的Al枝晶中,还存在着大量的In质点;并且这些质点的分布具有某种规律性,由此形成了与地基样品显微组织上的明显差异,反映出一种与重力效应相关的材料凝固特性。

The microstructural feature of Al-In monotectic alloy processed under microgravity has been investigated in comparison between space and ground-based samples. It was found that in the space sample, there are a lot of In particles in Al dendrite, but no more in the ground-based one. Moreover, the In particles dis- tribute with regularity and the Al dendrite has an obvious boundary layer marked by a string of particles. Thus, the distinction between them may reflect the chara- cteristics of the solid/liquid interface during solidification under different gravity conditions.