Superplastic forward and reverse bidirectional variable-temperature extrusion forming method and application

Abstract

The invention provides a superplastic forward and reverse bidirectional variable-temperature extrusion forming method and application. Magnesium-lithium alloy material forming numerical simulation analysis is carried out based on tested magnesium-lithium alloy material forming performance parameters and technological parameters, and macroscopic deformation and microstructure evolution in the part forming process are predicted by establishing a thermal-mechanical coupling finite element simulation model, an actual simulation sample test result is compared, the accuracy of numerical analysis is verified, the feasibility of die design of the magnesium-lithium alloy is judged, and forming process optimization is conducted according to a finite element simulation result. According to the method, superplastic forward and reverse bidirectional variable-temperature extrusion forming is adopted, large deformation is achieved, and meanwhile the double effects of refining grains and improving the mechanical property can be achieved. In the manufacturing process, material grains are refined, the mechanical property is greatly improved, and high performance is achieved while residual stress is eliminated.

Description

technical field [0001] The invention relates to the technical field of manufacturing magnesium-lithium alloys, in particular to a superplastic front and back bidirectional temperature-variable extrusion forming method and its application. Background technique [0002] For the key structural parts of the new generation of national defense cutting-edge weapons and equipment in the fields of aerospace and weapons, high specific strength, high specific stiffness and excellent conventional mechanical properties are required. higher and higher requirements. Saving fuel consumption, enhancing the carrying capacity of rockets, and increasing the flight speed and payload of aircraft have always been the goals we are constantly exploring and pursuing. In addition, the lightweight requirements of core components such as civil vehicles, computers, and mobile phones also place demands on new materials and their precision manufacturing. To achieve these goals, there is an increasing dem...

AI Technical Summary

Problems solved by technology

However, magnesium-lithium alloy components manufactured by traditional casting methods are difficult to achieve both low density and strength, and there are various casting defects such as holes, segregation, and uneven composition, resulting in poor high temperature resistance and easy corrosion.

Through plastic deformation methods, such as rolling, extrusion, forging and other forming processes, casting defects can be significantly reduced, the grains of the alloy can be refined, and the comprehensive mechanical properties of the alloy can be improved. However, how to achieve high strength while ensuring large deformation, also face challenges

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