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研究了不同冷却速率对Zn-27Al合金微观组织结构的影响,用铜模喷铸法制备φ5mm、φ2mm、φ1mm圆柱试样,通过熔体急冷法制备条带样品,利用扫描电子显微镜和X光衍射仪分别观察其组织形貌、分析其试样的相组成并计算晶格常数。结果表明,不同冷却速率下组织形态会发生显著变化,随着冷却速率的提高,其形貌按河流状、树枝晶、规则网格状、无规则形貌逐步过渡并使组织变得细小致密均匀;快速凝固条件下,更多的Zn原子固溶在Al晶格中,改变了富Al相的晶面间距。
The effects of different cooling rates on the microstructure of Zn-27Al alloy were studied. Cylindrical samples of φ5mm, φ2mm and φ1mm were prepared by copper die casting. The samples were prepared by melt quenching. The microstructure of Zn-27Al alloy was characterized by scanning electron microscopy and X-ray diffraction The morphology of the samples was observed, the phase composition of the samples was analyzed, and the lattice constants were calculated. The results showed that the morphologies of the tissues changed significantly under different cooling rates. With the increase of the cooling rate, the morphologies of the tissues changed gradually according to the river shape, the dendrites, the regular grids and irregular shapes, and the tissues became fine and even In the rapid solidification condition, more Zn atoms are dissolved in the Al lattice, changing the interplanar spacing of the Al-rich phase.