High-strength and high-corrosion-resistant ternary magnesium alloy and preparation method thereof

A preparation method of a high-strength and high-corrosion-resistant ternary magnesium alloy, the method comprising the following steps:

• (1) under a protective atmosphere, preparing a magnesium alloy melt from an Mg—Y master alloy, an aluminum ingot and a magnesium ingot;
• (2) under the protective atmosphere, stirring the magnesium alloy melt, holding at 720-740° C. for 20-60 min, then performing refined degassing and deslagging at 730-750° C., holding again at 720-740° C., and performing heat preservation at 720-740° C. for 20-60 min to obtain a magnesium alloy liquid;
• and
• (3) under the protective atmosphere, casting the magnesium alloy liquid into a mold to form an ingot, and finally obtaining the corrosion-resistant ternary magnesium alloy,
• wherein the corrosion-resistant ternary magnesium alloy includes the following elements in percentage by weight:
• 8-12 wt % of Y, 0.6-3 wt % of Al, and the balance of Mg, and
• wherein the corrosion-resistant ternary magnesium alloy includes a lath-shaped LPSO phase and Al2Y particles,
• wherein the ingot is solution-treated to obtain the corrosion-resistant ternary magnesium alloy,
• wherein a temperature of the solution treatment is 500-580° C., a time of the solution treatment is 8-24 h.