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| THE MODIFICATION OF Si PHASE IN Al-Si EUTECTIC ALLOYS——Effect of Element Addition on Microstructures of Al-Si and Al-Si-Ge Eutectic Alloys |
| Zhang Qiyun; Liu Shuqi; Fan Xiaohong (Department of Chemistry; Beijing University) |
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Cite this article:
Zhang Qiyun; Liu Shuqi; Fan Xiaohong (Department of Chemistry; Beijing University). THE MODIFICATION OF Si PHASE IN Al-Si EUTECTIC ALLOYS——Effect of Element Addition on Microstructures of Al-Si and Al-Si-Ge Eutectic Alloys. Acta Metall Sin, 1982, 18(5): 581-653.
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Abstract The effect of micro-amount element additions on the microstructures of Al-Ge and Al-Si-Ge eutectic alloys has been studied by means of metallographic method. For Al-Ge eutectics, no evidence was found of occurring any modification something like that exists in the Al-Si system. Some elements which belong to the ⅣB, ⅤB and ⅥB groups in the periodic table of elements seriously influence their microstructures and change the feather-like Al-Ge euteetic into block Ge crystals. In the other case, it appears to move the eutectic point to the Al-rich side when some alkaline, alkaline earth and rare earth elements were added in this eutectic. The modifiers Na, Sr, La effective in the Al-Si system were scanned about their effects on the Al-Si-Ge system. In this ease, eutectic Si exists in modified clusters form and gradually dwindle their size with increasing the Ge content, finally they disappeared at the Al-Ge side. According to comparison of the modification between the Al-Ge and Al-Si systems, it was considered that the modification of Al-Si eutectic was mainly decided by the effects of modifier atoms on the epitaxial orientation relationship or decreasing the disregistry between {110}_(Si) and {100}_(Al).
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Received: 18 May 1982
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