Preparation method for deforming Al-Mg alloy with ultrahigh Mg content

Abstract

The invention relates to a preparation method for a deforming Al-Mg alloy with ultrahigh Mg content. The preparation method comprises the following steps of firstly, carrying out component homogenization treatment, densification treatment, and solid solution treatment for forming a single-phase solid solution on an Al-Mg alloy ingot at the temperature of 0-80 DEG C lower than the alloy solidus temperature; then carrying out plastic deformation at the temperature of 20-300 DEG C; and carrying out annealing at the temperature of 50-300 DEG C according to requirements so as to obtain the final deforming Al-Mg alloy with ultrahigh Mg content. Compared with an existing industrialized deforming and casting Al-Mg alloy manufacturing technology, the preparation method has the advantages that solidsolution strengthening, dislocation strengthening and grain boundary strengthening of Mg can be enhanced, and the strength of the Al-Mg alloy can be improved; and compared with a deforming Al-Mg alloy with ultrahigh Mg content prepared through severe plastic deformation and nanocrystalline powder consolidation, the method has the advantages that a large amount of deforming Al-Mg alloys with ultrahigh Mg content can be prepared efficiently at low cost, and a wide industrialization prospect can be achieved.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a preparation method of a deformed Al-Mg alloy with ultra-high Mg content. Background technique [0002] As a kind of non-age-hardening wrought Al alloy, the 5XXX series Al-Mg alloy with Mg as the main alloying element is widely used in aerospace (such as: space devices, aircraft, etc.), ground transportation (such as: automobiles, high-speed rail trains, subway trains, etc.) etc.), ships, petrochemicals, electronic devices (such as mobile phones, computers, etc.) and other fields have been widely used. In this type of alloy, the solid solution strengthening of Mg has an important contribution to the strength of the alloy, and the contribution of solid solution strengthening to the strength increases with the increase of the Mg content. However, the existing industrialized 5XXX series of deformed Al-Mg alloys The Mg content in the medium is all below 5% (mass percentage). In ...

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Problems solved by technology

In the existing literature, deformed Al-Mg alloys with Mg content greater than 5% (mass percent) are nanocrystalline powders mechanically alloyed through severe plastic deformation pathways (equal channel angular extrusion, high-pressure torsion, etc.) The amount of material prepared by severe plastic deformation is very limited and it is difficult to industrialize. The cost of consolidating nanocrystalline powder by mechanical alloying is relatively high, and the impurities introduced in the process of mechanical alloying damage the properties of Al-Mg alloy.

In addition, the Mg content in the industrialized cast Al-Mg alloy can reach up to 12% by mass, although the Mg can be completely dissolved by solution treatment (the limit solid solubility of Mg in Al is 17% by mass). However, due to the lack of plastic deformation, not only the dislocation strengthening caused by plastic deformation is lacking, but also the pores (porosity) in the as-cast structure cannot be eliminated, and the coarse grains cannot be refined. Severely reduces the strength and ductility of Al-Mg alloys

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