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.