EFFECT OF MISCHMETAL ON SOLIDIFICATION MICROSTRUCTURE OF AZ91D MAGNESIUM ALLOY

Acta Metall Sin

2006, Vol. 42

Issue (8): 835-842 DOI:

Research Articles

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EFFECT OF MISCHMETAL ON SOLIDIFICATION MICROSTRUCTURE OF AZ91D MAGNESIUM ALLOY

Weichao Zheng;shuangshou li;;

清华大学金属工艺学教研室

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Weichao Zheng; shuangshou li. EFFECT OF MISCHMETAL ON SOLIDIFICATION MICROSTRUCTURE OF AZ91D MAGNESIUM ALLOY. Acta Metall Sin, 2006, 42(8): 835-842 .

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Abstract The effects of cerium-rich mischmetal ranging from 0.02% to 1.2% on the grain size, dendrite size, eutectic microstructure and characteristic parameters of the cooling curve of AZ91D magnesium alloy were investigated. The results showed that when adding mischmetal into AZ91D magnesium alloy, mischmetal reacted with Al8(Fe,Mn)5 or ε-AlMn phases which served as the heterogeneous nuclei in the melt, and formed Al-RE-Mn phases, thus it reduced the amount of the heterogeneous nuclei and resulted in the grain and dendrite coarsening. In addition, mischmetal reacted with aluminum to form Al11RE3 phases, consumed a part of aluminum atoms, and reduced the amount of the eutectic microstructure. Under the solidification condition of the sand mold, the lowest temperature of the primary phase nucleation rised with increasing the amount of mischmetal addition, while the minimum temperature and growth temperature of the eutectic reaction both increased firstly and then decreased. Consequently, the temperature difference of the eutectic recalescence fluctuated.

Key words: AZ91D magnesium alloy mischmetal grain size dendrite size thermal analysis

Received: 07 December 2005

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