Microstructures and creep properties of Mg-6Al based magnesium alloys with strontium and calcium addition

Acta Metall Sin

2006, Vol. 42

Issue (12): 1267-1273 DOI:

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Microstructures and creep properties of Mg-6Al based magnesium alloys with strontium and calcium addition

东南大学材料科学与工程系

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. Microstructures and creep properties of Mg-6Al based magnesium alloys with strontium and calcium addition. Acta Metall Sin, 2006, 42(12): 1267-1273 .

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Abstract The microstructure, tensile and creep properties of Mg-6Al-2Sr and two Mg-6Al-(1-2)Sr-1Ca based alloys have been investigated. The results indicate that the as cast microstructure of Mg-6Al-2Sr alloy consists of the dendritic -Mg and lamellar Al4Sr intermetallics at grain boundaries. Calcium addition to Mg-6Al-2Sr alloy results in the formation of Mg2Ca compound and a Mg-Al-Sr ternary intermediate phase, and the significant improvement of creep properties. The SEM microstructure observations performed on the samples after creep tests reveal that the intermediate phases in the Mg-6Al based alloy alloys with Sr and Ca additions have high thermodynamic stability. Discontinuous precipitation of β-Mg17Al12 occurs in Mg-6Al-2Sr alloy during creep deformation, however, no obvious changes have been observed in the microstructure of the alloys with combined addition of Sr and Ca after creep tests. The die cast sample shows finer microstructure and higher room temperature and high temperature tensile properties while relatively lower creep resistance in comparison with the samples which were cast by water cooled mould.

Key words: heat-resistant magnesium strontium calcium die cast water cooler mould creep resistance

Received: 14 March 2006

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TG146.22

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I12/1267

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