A heat treatment method for controlling the residual stress of aluminum matrix composites/aluminum alloys

Abstract

The invention relates to a heat treatment method for controlling the residual stress of an aluminum-based composite material / aluminum alloy, which comprises the following steps: uniformly heating the aluminum-based composite material / aluminum alloy to the solid solution temperature, and performing water quenching after the solute elements are completely dissolved into the aluminum matrix Processing; after the material is quenched in water, cool it to water temperature, take it out and dry it and place it in an ultra-low temperature environment, and continue to keep it warm for a short time after it is completely cooled to the ultra-low temperature environment; take out the material and quickly put it into a circulating high-temperature liquid medium, and then put it Take out the material and carry out water cooling treatment at room temperature, take it out and dry after cooling to the water temperature; put the material in a cryogenic box and slowly cool it to the temperature of an ultra-low temperature medium (<-190°C, such as liquid nitrogen, liquid helium), and wait until the material is completely cooled to the target temperature After saving for a short period of time, take it out and immediately carry out the step 3 treatment again to complete the regulation of the residual stress relief of the aluminum matrix composite material / aluminum alloy material. The invention preserves the quenching structure of the material to the greatest extent, basically does not precipitate secondary phases, and can effectively control the quenching residual stress of the material.

Description

A heat treatment method for regulating the residual stress of aluminum-based composite material / aluminum alloy technical field The present invention relates to regulating and controlling aluminum-based composite material / aluminum alloy residual stress treatment technical field, particularly relate to a kind of regulation and control Heat treatment method for residual stress of aluminum matrix composites / aluminum alloys. Background technique As a typical light metal material, aluminum-based composite material has low density, high specific strength, good thermal conductivity, easy mechanical Due to the advantages of processing and high specific elastic modulus, it has gradually replaced some aluminum alloys and titanium alloys and developed into aerospace applications. Important material for key load-bearing complex components. With the development of the automotive industry and aerospace technology, related manufacturing fields The development trend of integral form...

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Problems solved by technology

[0008] In fact, since the ultra-low temperature aluminum alloy / aluminum matrix composite material enters the high temperature liquid environment, it will absorb a large amount of heat energy instantaneously, reduce the temperature of the liquid around the material, increase its dynamic viscosity (reduce fluidity), etc., the surface heat transfer of the low temperature material depends on the near The temperature and flow rate of the medium on the surface of the material do not depend on the temperature of the remote medium, so the above method does not realize the deep cooling and rapid heat treatment of the material in the true sense

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