RELATIONSHIP OF COMPOSITIONS, PHASE CONSTITUENTS AND SOLIDIFICATION PATHS OF CASTING Mg-Al-Zn ALLOYS

Acta Metall Sin

2009, Vol. 45

Issue (11): 1396-1401 DOI:

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RELATIONSHIP OF COMPOSITIONS, PHASE CONSTITUENTS AND SOLIDIFICATION PATHS OF CASTING Mg-Al-Zn ALLOYS

XIE Yu¹⁾; ZHANG Yan²⁾; CHEN Rongshi¹⁾; HAN Enhou¹⁾

1) State Key Laboratory for Corrosion and Protection; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016
2) No.59 Institute of China Ordnance Industry; Chongqing 400039

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XIE Yu ZHANG Yan CHEN Rongshi HAN Enhou. RELATIONSHIP OF COMPOSITIONS, PHASE CONSTITUENTS AND SOLIDIFICATION PATHS OF CASTING Mg-Al-Zn ALLOYS. Acta Metall Sin, 2009, 45(11): 1396-1401.

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Abstract

Casting Mg-Al-Zn alloys are promising for the automotive components loaded under both high strength and high ductility, as well as under high temperatures. The relationship of compositions, phase constituents and solidification paths of casting Mg-Al-Zn alloys were investigated by SEM/EDS, XRD and thermodynamic calculations. It is shown that the phase constituents of Mg-Al-Zn alloys are related to Zn/Al ratio; with the Zn/Al ratio increasing, the secondary phase γ-Mg₁₇Al₁₂ is gradually replaced by Φ-Mg₂₁(Zn, Al)₁₇ and eventually disappears completely. The phase consituents and solidification paths of the alloys under various conditions, including equilibrium, Scheil and permanent mould casting, were examined by thermodynamic calculation software Pandat with the availability of thermodynamic description of Mg-Al-Zn ternary system. The practical casting process deviates from the equilibrium; however, the practical phase constituents of the experimental alloys except ZA65 can be predicted by the Scheil model. Because of no considering the peritectic reaction in which solid participates as reactant, the Scheil model can not correctly predict the phase constituents of ZA65 alloy under permanent mould casting condition.

Key words: Mg-Al-Zn alloy phase equilibrium thermodynamics microstructure solidification path

Received: 19 May 2009

ZTFLH:

TG146.2

Fund:

Supported by National Natural Science Foundation of China (No.50574086) and National Key Basic Research and Development Program of China (No.2007CB613704)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I11/1396

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