CPC C22C 1/02 (2013.01) [B21J 1/06 (2013.01); B21K 1/40 (2013.01); C22C 23/02 (2013.01)] | 7 Claims |
1. A method for preparing a magnesium alloy for wheels, wherein the method comprises the following steps:
(1) batching, in mass percentage: Al: 2-3.0 wt. %; Zn: 0.5-1.0 wt. %; Mn: 0.3-0.5 wt. %; Ce: 0.15-0.3 wt. %; La: 0.05-0.1 wt. %, the balance is Mg for batching;
(2) smelting, putting a pure Mg ingot into a crucible of a smelting furnace, setting the furnace temperature at 700-730° C. and keeping the furnace temperature at 700-730° C., adding pure Al block and pure Zn block preheated to 50-80° C. into a magnesium solution after melting, then raising the smelting temperature to 760° C., and adding an Al—Mn master alloy, an Mg—Ce—La master alloy and an Mg—Ce master alloy preheated to 50-80° C. into the magnesium solution respectively; then raising the smelting temperature to 780° C., keeping the temperature for 5-15 minutes, then stirring for 3-10 minutes, introducing high-purity Ar gas for refining and degassing, adjusting and controlling temperature at 710° C.-730° C., and keeping the temperature for 2-10 minutes;
(3) pouring the solution obtained by the melting process into a first die to obtain the magnesium alloy, the pouring temperature is controlled above 680° C.;
(4) performing stress relief treatment on the magnesium alloy, keeping the temperature at 280-320° C. for 8-12 h, and then air cooling;
(5) extruding and deforming, heating the magnesium alloy with stress relieved to 250-380° C. within 30 minutes, then putting the magnesium alloy into a second die for deformation processing; the extrusion speed being 1 m/min-8 m/min, and air cooling after deformation processing.
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