The present invention relates to a high-strength Mg-Gd-Y-Zn-
Mn alloy. The
alloy comprises the following alloying elements distributed in the
alloy, by weight, 8.2-10.2% of Gd, 5.0-6.0% of Y, 0.5-4.0% of Zn, 0.5-0.8% of Mn, and the balance of Mg and inevitable impurities. The
alloy is prepared by adopting the following process: material preparing, vacuum melting and
ingot casting, uniformization annealing,
extrusion and heat treatment. According to the present invention, Mg, Zn, Gd and Y form a large amount of long period phases in the Mg-Gd-Y-Zn-
Mn alloy so as to provide a significant dispersion strengthening effect, and the
time effect treatment is adopted to introduce the strengthening effect of the metastable phase; the process is a preparation method for the high-strength deformation Mg alloy, wherein the method integrates
solid solution strengthening,
precipitation strengthening and deformation strengthening; the method has characteristics of simple process, strong portability, easy operation and low cost; with the method, tensile strength and yield strength of the allay at the
room temperature are significantly improved, and difficulty of allay application limitation due to low
mechanical property is solved so as to expand the application range of the Mg alloy.