Session A: Light MetalsNo Access

ANALYSIS ON THE MICROSTRUCTURE OF THE AS-CAST AND EXTRUDED Mg-(6-10)Li-3Al-Ce-Ca ALLOYS

Key Laboratory of Automobile Materials of Ministry of Education, Department of Education, Department of Materials Science & Engineering, Jilin University, No. 142 Renmin Street, Changchun 130025, PR China

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ZHANYI CAO

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RUIZHI WU

Key Laboratory of Superlight Materials & Surface Technology (Harbin Engineering University), Ministry of Education, Harbin 150001, China

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MILIN ZHANG

Key Laboratory of Superlight Materials & Surface Technology (Harbin Engineering University), Ministry of Education, Harbin 150001, China

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https://doi.org/10.1142/S0217979209060245Cited by:2 (Source: Crossref)

Abstract

Microstructural characterization of as-cast and extruded experimental alloys as (A) Mg-6.86Li-3.02Al-1.12Ce-0.7Ca (B) Mg-8.15Li-3.07Al-1.12Ce-0.72Ca (C) Mg-10.54Li-3.54Al-1.23Ce-0.94Ca are researched in this paper. The results show that the as-cast specimens of (A) and (B) are composed of α (Mg) phase, β (Li) phase, rod-like and bulk Al₂Ce compound. On the other hand, β phase (Li), bulk and rod-like Al₂Ce compound, Al²Ca compound at boundaries are observed in the as-cast (C) alloy. The addition of Ce and Ca also shows in the microstructure the presence of Al-Ce-Ca phase, a solid solution of Ca in Al2Ce compound. In the extruding alloys, the microstructure is refined and the β phase has the effect of coordination during deformation. The long rod-like and the bulk compounds become short rods and fine clumps distributing evenly in the extruding direction after extruding process. The microstructure of extruded Mg-10.54Li-3.54Al-1.23Ce-0.94Ca alloy testified the existence of eutectic structure.

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