Preparation method of Al-Cu-Mg-Ag ultrafine crystal heat-resistant aluminum alloy

Abstract

The invention provides a preparation method of an Al-Cu-Mg-Ag ultrafine crystal heat-resistant aluminum alloy, comprising the following steps: hot extrusion, solid solution hardening, equal channel angular pressing and ageing treatment, thus finally improving the heat resistance of Al-Cu-Mg-Ag alloy. The specific steps are as follows: homogenizing annealing of the as-cast aluminum alloy, hot extrusion with the extrusion ratio of 8-15, multi-pass equal channel angular heat extruding deformation at the temperature of 350-430 DEG C, solution treatment, hardening in water at a room temperature, and then ageing treatment at the temperature of 150-210 DEG C; or solution treatment of the alloy in a hot extrusion state, hardening in water at the room temperature, multi-pass equal channel angular heat extruding deformation at the room temperature and then ageing treatment. The process method of the invention can improve the heat resistance of the Al-Cu-Mg-Ag alloy and enlarge the application range of the aluminum alloy on the basis of the existing alloy. The preparation method of the invention has simple process and convenient operation, and can effectively refine crystal particles of the Al-Cu-Mg-Ag alloy, improve the density of a precipitated and strengthened phase, enhance the overall strength and the high-temperature heat resistance of the Al-Cu-Mg-Ag alloy, and achieve industrialized production and application.

Description

technical field

[0001] The invention discloses a method for preparing an Al-Cu-Mg-Ag series ultrafine-grain heat-resistant aluminum alloy, which belongs to the preparation technology of aluminum alloy in the field of metallurgy technology. Background technique

[0002] Aluminum-copper-magnesium heat-resistant aluminum alloys are typical age-hardening aluminum alloys, and their main alloying elements are Al, Cu, Mg, Mn, Zr, etc., and are used as Aerospace structural materials. At present, the heat-resistant aluminum alloys widely used in industry are 2618 aluminum and 2219 aluminum alloys containing Cu and Mg. The typical composition of 2618 aluminum alloy is: 2.3wt% Cu ~ 1.6wt% Mg ~ 1.1wt% Fe ~ 1.0wt% Ni ~ 0.18wt% Si ~ 0.05wt% Ti, the rest is Al, and its room temperature tensile strength σ b 441MPa, σ at 200°C b It is 321MPa. Another typical heat-resistant aluminum alloy is 2219 aluminum alloy, its typical composition is 6.3wt% Cu ~ 0.3wt% Mn ~ 0.18wt% Zr ~ 0.10wt% V ~ 0...

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