Preparation method of quasicrystal reinforced fast hardening high strength deformation magnesium alloy

Abstract

A quasi-crystal reinforced high-strength deformable Mg-alloy is a thin Mg-Zn-RE-Zr band quickly solidified by 2D sheet flows. Its preparing process features that the percentage of quasi-crystal phase is controlled by controlling the thickness of thin band and the dispersity of molten body in two fast solidifying stages, and the size of quasi-crystal phase can be controlled by controlling the parameters in squeezer procedure. Its advantages are high strength (500MPa) and extensibility (10%) and low density.

Description

1. Technical field [0001] The invention relates to a preparation of a material, a preparation of a high-performance magnesium alloy, in particular to a preparation method of a quasi-crystal enhanced rapid solidification high-strength deformed magnesium alloy. 2. Background technology [0002] In recent years, rapid solidification has made remarkable achievements in the application of magnesium alloys. The tensile strength of ultra-high-strength magnesium alloys prepared by rapid solidification has reached 935 MPa, which indicates that its specific tensile strength has reached 480 MPa / (g cm -3 ), much higher than the ultra-high strength Ti-6Al-4V T6 alloy (tensile strength 1167MPa, specific strength 260MPa / (g·cm -3 )); It was found that the addition of Y and heavy rare earth alloy elements to Mg alloys can obtain a metastable phase that exists stably below 300 °C. This type of alloy has excellent room temperature, high temperature performance and corrosion resistance after b...

AI Technical Summary

Problems solved by technology

But in general, the research work on the key basic issues that restrict the preparation and application of ultra-high-strength magnesium alloys, such as the microstructure design, preparation process and strengthening mechanism of rapidly solidified magnesium alloys, is still incomplete, especially the mesophase in the form of quasicrystals. The basic research and material preparation of the strengthening phase of rapidly solidified high-strength wrought magnesium alloys have not been reported yet

Although stable quasicrystals have been found in alloy systems such as Mg-Zn-Y, whether stable quasicrystals will further fundamentally change the physical, chemical, and mechanical properties of high-strength wrought Mg alloys remains unreported.

Interaction of alloying elements in rapidly solidified high-strength wrought magnesium alloys, micro-segregation mechanism, formation of quasicrystals, volume fraction of quasicrystals as reinforcing phase, shape, habit surface and habit direction, whether dislocations can cut through particles or not Basic research work such as the effect of aging on the formation of quasicrystals and the effect on material properties have not been reported.

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