Extrusion device and method for connecting magnesium alloy with aluminum alloy

Abstract

The invention discloses an extrusion device and method for connecting a magnesium alloy with an aluminum alloy. The device comprises a male die and a female die with an extrusion cavity. The magnesium alloy, an amorphous alloy and the aluminum alloy are arranged in the extrusion cavity. The male die extrudes the magnesium alloy, the amorphous alloy and the aluminum alloy in the extrusion cavity under the effect of external force, the magnesium alloy, the amorphous alloy and the aluminum alloy are arranged in the female die and enter a forming cavity under the extrusion effect of the male die after being heated so as to be formed, common thermal deformation is conducted in the state of a high temperature and three-way pressure stress, and stable connection is achieved. According to the extrusion device and method, the amorphous alloy is used as an intermediate transition layer, direct contact between the aluminum alloy and the magnesium alloy is avoided, direct element diffusion between the aluminum alloy and the magnesium alloy is avoided, it is avoided that Al-Mg intermetallic brittle compounds and welding gaps are formed, the connection quality is improved, the magnesium alloy, the amorphous alloy and the aluminum alloy are all in the low-stress super-plasticity state by means of the combination of the optimal extrusion temperature and the optimal extrusion speed, and formation of a connector is promoted.

Description

technical field [0001] The invention relates to the connection of magnesium alloy and aluminum alloy, in particular to an extrusion device and method for connecting magnesium alloy and aluminum alloy. Background technique [0002] One of the most urgent problems in modern machine manufacturing is to reduce metal consumption while improving the technical performance and reliability of structures and equipment. Aluminum alloy has developed rapidly due to its low density, high strength, corrosion resistance, high thermal conductivity and electrical conductivity, and good processing performance. It has been widely used in various fields of national economy and national defense construction, and its consumption is second only to steel materials. Become the second largest metal material. Magnesium alloys have many advantages such as low density, high specific strength and specific stiffness, good dimensional stability, superior thermal conductivity, good cutting performance, easy...

AI Technical Summary

Problems solved by technology

Because the traditional welding method is difficult to control the temperature stably, it is easy to cause the grains in the heat-affected zone of aluminum and magnesium alloy welding to be coarse.

The emerging welding method has gradually replaced the traditional welding method with the characteristics of fast speed, narrow welding heat-affected zone and no pollution. However, due to the poor compatibility of magnesium and aluminum, it is easy to form Al-Mg intermetallic brittleness near the interface. At the same time, due to the large difference in element diffusion speed between aluminum alloy and magnesium alloy at the weld, voids are easily generated, which reduces the bonding performance at the interface

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