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| THE MODIFICATION OF Si PHASE IN Al-Si EUTECTIC ALLOYS (III)——A Comparative Study on Modification of Model System Zn-Ge |
| by LIU Shuqi; ZHANG Qiyun; CHEN Yunlin (Department of Chemistry; Peking University) (Manuscript received 30 December; 1985; revised manuscript 22 September; 1986) |
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Cite this article:
by LIU Shuqi; ZHANG Qiyun; CHEN Yunlin (Department of Chemistry; Peking University) (Manuscript received 30 December; 1985; revised manuscript 22 September; 1986). THE MODIFICATION OF Si PHASE IN Al-Si EUTECTIC ALLOYS (III)——A Comparative Study on Modification of Model System Zn-Ge. Acta Metall Sin, 1987, 23(4): 341-343.
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Abstract A comparative study of Zn-Ge eutectic with Al-Si system has been made by metallography and SEM. It is found that the chain Ge crystals connected each other with top corner of octahedrons formed in this system at lower cooling-rate solidification. This is believed to be effect of high viscosity in molten Zn matrix. Meanwhile, the effects of microamount Li, Na, Mg, Ca, Sr, Ba and La on microstructures of Zn-Ge eutectic were also scanned, Modified structures obtained only with additions of Na, Sr, La and Ba. Among those modifiers, Sr is the strongest, and the weakest is Ba. Modified structure of eutectic Ge were also in the form of chain crystals something like that in the mentioned blank system but smaller in the size. The appearance of modified Ge is quite different from that modified Si in Al-Si system. To these more equilibrium eutectic crystals, it is deduced that modifiers denucleated the melt, and eutectic Ge was solidified under a supercooling condition. Compared to the facts in system Zn-Ge, the modification of Al-Si eutectic was discussed as a multiple effects.
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Received: 18 April 1987
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