Method for extruding high-performance light alloy sheet materials

Abstract

The invention discloses a method for extruding high-performance light alloy sheet materials. The method comprises the following steps: 1) respectively taking at least one block of magnesium alloy and at least one block of aluminium alloy, and overlapping and fixing the magnesium alloy and the aluminium alloy; 2) putting a magnesium-aluminium composite block which is obtained in the step 1) into an extrusion mould to extrude the magnesium-aluminium composite block, and at the same time extruding the magnesium-aluminium composite block from the extrusion mould to obtain the composite extrusion sheet materials. According to the method for extruding the high-performance light alloy sheet materials, disclosed by the invention, greater shear stress is introduced in the same metal block, and metal mixing does not occur among all the metal sheet materials, so that crystal grains can be refined, and the texture can be weakened; for the method for extruding the high-performance light alloy sheet materials, which disclosed by the invention, only the extruding and compositing manner needs to be changed, and the extrusion mould does not need to be redesigned, so that the method has a greater production and research value.

Description

technical field [0001] The invention belongs to the field of metals and alloys, and relates to a metal forming method, in particular to a method for synchronous extrusion processing to produce magnesium-aluminum composite plates. Background technique [0002] Magnesium alloy has the advantages of high specific strength and specific stiffness, good thermal conductivity and damping performance, excellent electromagnetic shielding performance and machining performance, and has a wide range of application values ​​in various fields such as aerospace, automobiles, electrical appliances, and communications. Since the crystal structure of magnesium alloy is hexagonal close-packed and lacks an independent slip system, processing is difficult. So far, most magnesium alloy products are mainly produced by casting, but casting products have shortcomings such as coarse structure and many defects, which lead to unsatisfactory mechanical properties, which greatly restricts the wide applica...

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Problems solved by technology

Although these two methods both add magnesium and aluminum to the extruder simultaneously for extrusion, their purpose is mainly to form an aluminum alloy protective layer on the surface of the magnesium alloy, thereby improving its corrosion resistance, and in these two methods, the magnesium alloy is completely Covered by aluminum alloy, the lateral flow of the magnesium alloy extruded sheet is limited by the clad aluminum during extrusion, which easily produces uneven lateral distribution, which eventually leads to uneven lateral structure and properties of the entire composite material, and serious anisotropy , can not meet the requirements of use well; in addition, during the extrusion process of this method, the magnesium alloy is not in contact with the extrusion cylinder as a whole, and it is in a state of symmetrical stress along the thickness direction (the deformation process of the magnesium alloy is the same as that of the ordinary magnesium alloy when extruded symmetrically. similar, cannot improve the basal texture of magnesium alloys)

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