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首页> 外文期刊>Materials Letters >Morphologies of Si phase and La-rich phase in as-cast hypereutectic Al―Si―xLa alloys
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Morphologies of Si phase and La-rich phase in as-cast hypereutectic Al―Si―xLa alloys

机译：铸态过共晶Al-Si-xLa合金中Si相和富La相的形貌

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摘要

In the present study, the diversified morphologies of Si phase and La-rich phase in as-casted hypereutectic Al―Si―xLa alloys are presented and investigated. The morphological features were examined using conventional optical microscopy and SEM for observations conducted on the optical samples and deep-etched samples, respectively. The results show that primary Si crystals show several morphologies, such as feathery, star-shaped, faceted polygonal, platelet and so on. There are three types of fivefolded Si crystals existing in the present study, fivefold symmetry as radial growth alone: thin-branched, coarse-branched and well-defined star-shaped growing from the preferred growth from the tips of branches. The eutectic Si in unmodified Al―Si alloys appears only in fibrous morphology, while discrete and interconnected coral and rodlike eutectic Si particles were observed in alloys with the addition of La. The La-rich phase also grows into a variety of morphologies, such as needlelike, broken rodlike in pores, spherical, and flat platelet. In optical microscopy, La-rich phase is observed to envelope some small polygonal Si crystals.
机译：本文研究并研究了铸态过共晶Al-Si-xLa合金中Si相和富La相的多种形貌。使用常规光学显微镜和SEM检查形态特征，以分别在光学样品和深蚀刻样品上进行观察。结果表明，原始硅晶体表现出几种形态，如羽毛状，星形，多面多边形，片状等。本研究中存在三种类型的五重硅晶体，仅径向生长就具有五重对称性：细枝状，粗枝状和轮廓分明的星形生长，这是从分支尖端的首选生长开始的。未改性的Al-Si合金中的共晶Si仅以纤维形态出现，而在添加La的合金中观察到离散且相互连接的珊瑚和棒状共晶Si颗粒。富La相也生长为多种形态，例如针状，在细孔中破碎的杆状，球形和扁平血小板。在光学显微镜下，观察到富La相包裹了一些小的多边形Si晶体。

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