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| EFFECTS OF COOLING RATE AND MODIFIER CONCENTRATION ON MODIFICATION OF Al-Si EUTECTIC ALLOYS |
| Zheng Chaogui; Yao Lianke; Zhang Qiyun (Department of Chemistry; Beijing University) |
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Cite this article:
Zheng Chaogui; Yao Lianke; Zhang Qiyun (Department of Chemistry; Beijing University). EFFECTS OF COOLING RATE AND MODIFIER CONCENTRATION ON MODIFICATION OF Al-Si EUTECTIC ALLOYS. Acta Metall Sin, 1982, 18(6): 661-670.
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Abstract The effect of 12 elements such as Li, Na, K, Mg, Ca, Sr, Ba, La, Sm, Y, Sb and Bi on the modification of the Al-Si eutectic alloys was systematically investigated by means of their microstructure observations. The range of modifying concentration for each modifier under various cooling rates was detected and their effects on microstructures of Al-Si eutectic alloys with same modifier concentration but varied cooling rates were also studied. A critical cooling rate, v_c, of modification is always presented for each own modifier. The modification does not occur at a lower cooling rate than v_c with whatever the concentration of the modifier. The lower the v_c of a modifier, the stronger will be its modifying ability. Among these modifiers studied, the modifying abilities of Na, K, Sr and La with their v_c values lower than 40℃/min are the strongest. It seems to be suggested that v_c is available for a quantitative scale of the modifying ability assessment of a modifier.
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Received: 18 June 1982
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