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MAGNESIUM-BASED CASTING ALLOYS HAVING IMPROVED ELEVATED TEMPERATURE PERFORMANCE, OXIDATION-RESISTANT MAGNESIUM ALLOY MELTS, MAGNESIUM-BASED ALLOY CASTINGS PREPARED THEREFROM AND METHODS FOR PREPARING SAME
MAGNESIUM-BASED CASTING ALLOYS HAVING IMPROVED ELEVATED TEMPERATURE PERFORMANCE, OXIDATION-RESISTANT MAGNESIUM ALLOY MELTS, MAGNESIUM-BASED ALLOY CASTINGS PREPARED THEREFROM AND METHODS FOR PREPARING SAME
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机译:具有改善的高温性能的基于镁的铸造合金,耐氧化的镁合金熔体,制备的基于镁的合金铸件及其制备方法
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摘要
A magnesium-based casting alloy having good salt-spray corrosion resistance and improved creep resistance, tensile yield strength and bolt-load retention, particularly at elevated temperatures of at least 150° C., is provided. The inventive alloy comprises, in weight percent, 2 to 9% aluminum and 0.5 to 7% strontium, with the balance being magnesium except for impurities commonly found in magnesium alloys.;A method of making an oxidation-resistant alloy melt, and the alloy melt prepared by such a method, are also provided. The alloy melt comprises magnesium as a primary alloying metal, and aluminum and strontium as secondary alloying metals, while the inventive method comprises: melting the alloying metals under an atmosphere of an inert gas selected from a mixture of carbon dioxide and sulfur fluoride gas, a mixture of nitrogen and sulfur dioxide gas, and combinations thereof.;Further provided is a method of making a magnesium-based alloy casting from the above-identified alloy melt, and the alloy casting prepared by such a method.
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