High-strength and heat-resistant magnesium alloy containing two rare earths and preparation method thereof

Abstract

The invention discloses a high-strength and heat-resistant magnesium alloy containing two rare earths. The high-strength and heat-resistant magnesium alloy containing the two rare earths comprises the components as follows: 14.0-17.0wt% of Y rare earth, namely Gd, Y and Er, 0.5-2.5wt% of Ce rare earth, namely one or several of La, Ce, Pr, Nd and Sm, 0.3-1.0wt% of Zr, impurities and the balance of Mg, wherein Gd is 11.0-15.0wt%, Y is 0.5-4.0wt% and Er is 0.5-2.0wt%; the content of Nd and Sm elements is 0.2wt% or less of the total amount of the magnesium alloy, or 0; the impurities including Fe, Si, Mn and a small amount of chloride; Fe is less than or equal to 0.002wt %, Si is less than or equal to 0.04wt%, Mn is less than or equal to 0.02wt%, and chloride is less than or equal to 0.002wt%; the impurity content is more than 0; Er in the Y rare earth can be replaced by one or several of Tb, Dy, Ho, Yb and Tm. The magnesium alloy has relatively high mechanical properties at room temperature and relatively stable high temperature creep resistance, and has relatively high yield rate of rare earth elements in the smelting process.

Description

technical field [0001] The invention relates to a high-strength heat-resistant magnesium alloy containing two-series rare earths and a preparation and processing method thereof. The so-called two-series rare earths refer to Y-series rare earths (metals with atomic numbers from 64(Gd)-71(Lu) and Y) and Ce-series Rare earths (metals with atomic numbers ranging from 57(La) to 63(Eu)) belong to the category of industrial magnesium alloys. Background technique [0002] The density of magnesium is about 2 / 3 of that of aluminum and 1 / 4 of that of steel. Compared with other metal structural materials, magnesium and magnesium alloys have high specific strength, specific stiffness, shock absorption, thermal conductivity, machinability and recyclability, as well as electromagnetic shielding and high radiation resistance, so in Automobiles, electronics, electrical appliances, aviation, aerospace and national defense military fields have extremely important application value and broad a...

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Problems solved by technology

Due to the relatively few slip systems of magnesium alloys and good casting performance, the development of cast magnesium alloys is better than that of wrought magnesium alloys. However, the material of magnesium alloy castings is not dense enough, and its comprehensive strength and performance cannot meet certain requirements. The higher requirements of some load-bearing components limit the application of magnesium alloys to a certain extent.