Technique and apparatus for preparing particle reinforced aluminum-based composite material by reciprocating type extrusion

Abstract

The invention relates to a process and a device for preparing a particle-reinforced aluminum-matrix composite by means of utilizing reciprocating extrusion. The device comprises an extrusion barrel, an extrusion barrel heating member, a semi-ring-shaped cavity die, a temperature control thermocouple, a die connection guiding rod, a die connection turning beam, a die turning mechanism support, an extrusion cushion, a male die, a die turning connecting beam, a die turning mechanism elastic supporting member, a die connection guiding rod nut and a U-shaped extrusion rod. When the device is used, a die connecting device and a die turning mechanism are used for realizing the equivalent volumes of an extruded material and a mould cavity and for performing repeated extrusion and upsetting by alternately applying pressures in different directions to the two ends of the extruded material so as to cause the material to be kneaded. The extruded material can generate strong plastic deformation and simultaneously undergo dynamic recrystallization so that the interface of the extruded powder material is fully welded together. Due to the dynamic recrystallization, newly-generated crystals are remarkably thinned, and the isotropic fine-grain aluminum-matrix composite is obtained.

Description

technical field

[0001] The invention relates to a process and a device for preparing particle-reinforced aluminum-based composite materials by means of reciprocating extrusion. technical background

[0002] In view of the shortcomings of traditional materials, it is more and more important to study the transformation of traditional materials and the development and application of new materials from the relationship between internal organization, structure and material properties of materials. Improving the performance of materials mostly focuses on the refinement of grains, and the physical and mechanical properties of alloy materials are often significantly improved after obtaining ultra-fine structures. When the grains are refined to the submicron or nanoscale, the material exhibits some extraordinary properties. There are many methods to refine the structure of materials, such as metallurgical methods (such as refining grains through alloying), rapid solidification, heat...

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