Machining method of enhanced magnesium-aluminum laminar composite tubular product

Abstract

The invention relates to improvements on composite tubular product enhancement and a machining method, in particular to a machining method of an enhanced magnesium-aluminum laminar composite tubular product. In the method, the advantages of light weight of a magnesium alloy and corrosion resistance and high plasticity of an aluminum alloy are effectively utilized, a grain structure is refined through pipe wall equal-diameter repeated extrusion, twice plastic deformation can be realized through one-time propelling, and severe plastic deformation is introduced circularly in a reciprocating way, so that the grain structure is effectively refined, and the intensity is enhanced; magnesium and aluminum layers are combined through a metallurgic reaction, so that the enhanced magnesium-aluminum laminar composite tubular product with excellent comprehensive performance is obtained, and the application range of the magnesium alloy is expanded.

Description

technical field [0001] The invention relates to the improvement of composite pipe strengthening and processing methods, in particular to a processing method of reinforced magnesium-aluminum layered composite pipes, and belongs to the field of preparation and application of non-ferrous metal composite materials. Background technique [0002] Magnesium and magnesium alloys have the advantages of low density, high specific strength, good damping and shock absorption performance, good thermal conductivity, easy cutting and easy recycling, and have great applications in many fields such as aerospace, automobiles, computers, consumer electronics, etc. Potential, known as "21st century green engineering materials". However, the crystal structure of magnesium alloy is a hexagonal close-packed structure (HCP), and there are few independent slip systems at room temperature, and its plastic deformation is limited to the slip of the basal plane {0001}<11-20> and the conical surfac...

AI Technical Summary

Problems solved by technology

However, the crystal structure of magnesium alloy is a hexagonal close-packed structure (HCP), and there are few independent slip systems at room temperature, and its plastic deformation is limited to the slip of the basal plane {0001} and the conical surface {10-12} twins, poor plastic processing ability

Moreover, the strength of magnesium alloy is insufficient, and its heat resistance, creep resistance and high temperature service performance are poor, which restricts its large-scale application in aerospace and automobile fields.

In addition, the chemical properties of magnesium are lively, the electrode potential is very low, and its corrosion resistance is very poor.

These shortcomings of magnesium alloys seriously restrict its application. It is necessary to improve the plastic deformation capacity, strength and corrosion resistance of magnesium alloys in order to expand the scope of use of magnesium alloys.

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