Multi-element microalloyed high-efficiency extruded magnesium alloy and preparation method thereof

Abstract

The invention relates to the field of metal materials, and provides a multi-element microalloying efficient extrusion magnesium alloy and a preparation method thereof. The alloy is prepared from the following components in percentage by mass: 0.4 to 1.1 percent of aluminum, 0.4 to 0.6 percent of manganese, 0.01 to 0.05 percent of calcium, 0 to 1.6 percent of additive elements, less than or equal to 0.05 percent of inevitable impurities and the balance of magnesium, the additive element is one or any combination of zinc or rare earth, the content of zinc is 0-1.0%, the content of rare earth is one or combination of cerium or neodymium, the content of cerium is 0-0.3%, the content of neodymium is 0-0.3%, and the total content of alloying elements is less than or equal to 3.4%. The preparation method comprises the steps of smelting, gravity casting and efficient extrusion forming. The yield strength of the obtained alloy ranges from 212 MPa to 222 MPa, the tensile strength ranges from 275 MPa to 285 MPa, the ductility ranges from 12% to 17%, and the ratio of the yield strength to the total content of elements ranges from 86 MPa / wt.% to 206 MPa / wt.% and is 3-15 times of the ratio of the yield strength to the total content of the elements of existing commercial magnesium alloy.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a multi-element microalloying high-efficiency extruded magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium and magnesium alloys have a series of advantages such as low density, high specific strength and specific stiffness, good damping and shock absorption, electromagnetic shielding and biocompatibility. Significant contributions to energy saving, etc., are regarded as ideal structural materials for aerospace, automotive industry, 3C industry, biomedicine and other products. Especially in the automotive field, the use of magnesium alloy materials can reduce energy consumption while reducing weight. However, the application of magnesium alloys is still not as good as that of aluminum alloys, mainly because the unit cell of magnesium is a close-packed hexagonal structure, with low symmetry and few slip systems at room temperature, resulting in ...

AI Technical Summary

Problems solved by technology

Yet the application of magnesium alloy is still not as good as aluminum alloy, and this is mainly because the unit cell of magnesium is close-packed hexagonal structure, and symmetry is low, and slip system is few under room temperature, causes existing magnesium alloy to still have some significant defects: (i ) Low yield strength and tensile strength; (ii) low elongation, poor plasticity; (iii) poor creep resistance, etc.

Although the alloy achieves fast extrusion, its yield strength is only 96MPa, tensile strength is only 122MPa, and elongation is less than 2%, which cannot meet the actual production requirements for strength and plasticity.

In addition, the total weight percentage of the alloy elements is relatively high (11.8%) and long-term homogenization heat treatment (445°C / 24h) is required before deformation, which also increases the production and processing costs