Incubation and Fading of Sr Modification in Hypoeutectic Al-Si Alloys
By investigating systematically the change of modification effects during holding and remelting of A356 Alloy, incubation and fading of Sr modification are analyzed, as well as the effect of modified ingot on modification process. It is showed that fading of modification is due to Sr content less than some a critical value for melting loss, and effective period of modification is dependent on primary Sr content, melting process and refining process, etc; incubation period of Sr modification is related to the time of the dissolution of Al-10Sr master alloy, releasing of Sr atom, and absorption of Sr on Si crystal nucleus in melt; with modified ingot, incubation period is eliminated, and modification effect is stabilized.
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维普
