Effects of Ca Addition on Microstructure and Mechanical Properties of Mg-RE-Zn Casting Alloy

Abstract:

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Influences of Ca addition on microstructures and mechanical properties at room and elevated temperatures up to 300oC have been investigated for EZ43 (Mg-4%RE-3%Zn)-(0~1.2)%Ca permanent mould casting alloys, based on experimental results from optical micrography, X-ray diffractometry, scanning electron microscopy combined with energy dispersive X-ray spectroscopy and mechanical tests. With an increase in Ca content, yield strength is increased gradually at all temperatures, whereas elongation shows a decreasing tendency. High level of tensile strength around 150MPa is maintained until 250oC in the EZ43-0.8Ca and EZ43-1.2Ca alloys, meaning that Ca is very effective for improving elevated temperature strength of the Mg-RE-Zn alloy. The microstructural examinations reveal that Ca refines the a grains markedly, increases discontinuity of Mg12RE network intermetallic compound and dissolves into the Mg12RE phase. The refined a grains and Ca-containing Mg12RE with higher thermal stability are considered to be responsible for the improved mechanical properties at room and elevated temperatures for the EZ43-Ca alloys.

Info:

Periodical:

Materials Science Forum (Volumes 488-489)

Edited by:

W.Ke, E.H.Han, Y.F.Han, K.Kainer and A.A.Luo

Pages:

107-110

DOI:

10.4028/www.scientific.net/MSF.488-489.107

Citation:

J. H. Jun et al., "Effects of Ca Addition on Microstructure and Mechanical Properties of Mg-RE-Zn Casting Alloy", Materials Science Forum, Vols. 488-489, pp. 107-110, 2005

Online since:

July 2005

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Price:

$35.00

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