Method for preparing dual special structure combined reinforced Mg-Zn-Y alloy

Abstract

The invention relates to a method for preparing an icosahedral quasicrystalline phase and long-period stacking ordered structure combined reinforced Mg-Zn-Y alloy. The alloy prepared by the method contains the chemical elements in percentage by mass: 10wt% of Zn and Y and the balance of Mg, wherein Zn is added in the form of pure Zn, Y is added in the form of Mg-25wt%Y intermediate alloy, and Mg is industrial pure magnesium. According to the method, alloy structures, obtained after magnesium alloy is subjected to smelting, metal type molding and solid solution and grading aging treatment, are an alpha-Mg solid solution, an icosahedral quasicrystalline phase and a long-period stacking ordered structure phase; a quasi-crystal, which is formed through dispersion precipitation, depends on strong pinning on dislocation and forms a firm interface with a matrix, so that the magnesium alloy can be remarkably reinforced; a long-period structure and a matrix interface are in coherency, so that the thermal stability is very high, the coarsening is not easy, the dislocation motion and the extension of deformation twin crystals can be remarkably hindered, the mechanical properties of the alloy are improved obviously, the tensile strength can reach 352MPa to the maximum, and the elongation percentage can reach 7.5%. The method is beneficial to the promotion of the extensive application of high-strength magnesium alloy in many fields, such as automobiles, aviation and electronic communication.

Description

technical field [0001] The invention relates to a high-strength magnesium alloy material and a preparation technology, in particular to a preparation method of a double-special structural phase composite reinforced magnesium alloy, which belongs to the technical field of high-strength magnesium alloy processing. [0002] Background technique [0003] Magnesium alloy is currently the lightest metal structural material in engineering applications, and is known as the most potential green environmental protection material in the 21st century. In recent years, with the rapid development of spaceships, aircraft, missiles, automobiles, computers, communication products, and consumer electronics, higher requirements have been put forward for lightweight magnesium alloys, which in turn forces people to look for new solutions in alloy design and advanced processing. technological breakthrough. In the Mg-Zn-Y system, there are two special structural phases, quasicrystal and long-per...

AI Technical Summary

Problems solved by technology

In the Mg-Zn-Y system, there are two special structural phases, quasicrystal and long-period stacking ordered structure. Among them, the quasicrystal phase has a significant strengthening effect on the alloy by virtue of its own hardness and pinning effect on dislocations. The long-period structure is coherent with the matrix interface, which has high thermal stability and is not easy to coarsen. It can significantly hinder the dislocation movement and the expansion of deformation twins, and significantly improve the mechanical properties of the alloy. However, it is limited by two Due to the strict requirements of the special structure relative to the alloy composition and the problem of large size in the as-cast state, it is difficult to give full play to the strengthening advantages of the quasi-crystal and long-period structure by ordinary casting methods