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

An al-cu-mg-ag, ultra-fine grain technology, applied in the field of metallurgy, to achieve the effect of improving overall strength and high temperature heat resistance, simple process and convenient operation

Inactive Publication Date: 2010-11-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present inventor proposes to carry out micro-alloying treatment by doping rare earth elements to refine the crystal grains of the cast Al-Cu-Mg-Ag alloy, and then perform hot extrusion and solid solution aging treatment to improve the aging precipitation of the alloy process to further improve its heat resistance [Chinese patents: CN200710034858.X, CN200710192544.2, CN2007100360721.1], but the grains of the alloy are still coarse after hot extrusion deformation, and the average diameter of the grains is above 30um. limited improvement

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0020] The chemical composition of the alloy is: Al-5.3Cu-0.8Mg-0.6Ag-0.1Zr-0.3Mn (mass fraction) alloy ingredients (raw materials are: A00 pure aluminum, Al-50Cu master alloy, No. 2 industrial pure magnesium, 99.9% Silver, Al-10Mn master alloy, Al-4Zr master alloy) were smelted in a medium-frequency induction resistance furnace, and used C 2 Cl 6 Carry out scouring treatment, after standing still, remove slag, and cast into a round billet through an iron mold, 450? After homogenization treatment for 24 hours, at 390? Hot extrusion was carried out with an extrusion ratio of 12. The hot-extruded alloy is deformed by equal-diameter angular hot-extrusion. The die of equal-diameter angular extrusion adopts a right-angle equal-channel extrusion die. The extrusion temperature is 390 ° C and the extrusion passes are 6 times. After each equal diameter angular extrusion, put it into a furnace to heat to the extrusion temperature and keep it warm for 30 minutes, and then perform the ...

Embodiment 2

[0022]Adopt the billet of embodiment 1, 470? After homogenization treatment for 48 hours, at 430? Hot extrusion was carried out with an extrusion ratio of 8. The alloy in the extruded state is deformed by equal-diameter angular hot extrusion. The die of equal-diameter angular extrusion adopts a right-angle equal-channel extrusion die, the extrusion temperature is 430 ° C, and the extrusion passes are 4 times. After each equal diameter angular extrusion, put it into a furnace to heat to the extrusion temperature and keep it warm for 60 minutes, and then perform the next equal diameter angular extrusion. Turn 90° after each equal radial angle extrusion for the next equal diameter angle extrusion. After equal diameter hot extrusion, it was solution treated at 535°C for 6h, quenched in water at room temperature, and then aged at 150°C for 40h. The room temperature hardness and high temperature heat resistance properties of the alloy are shown in Table 1.

Embodiment 3

[0024] Adopt the billet of embodiment 1, 420? After homogenization treatment for 35h, at 350? Hot extrusion was carried out with an extrusion ratio of 15. The alloy in the extruded state is deformed by equal-diameter angular hot extrusion. The die of equal-diameter angular extrusion adopts a right-angle equal-channel extrusion die. The extrusion temperature is 350 ° C and the extrusion passes are 8 times. After each equal diameter angular extrusion, put it into a furnace to heat to the extrusion temperature and keep it warm for 10 minutes, and then perform the next equal diameter angular extrusion. Turn 90° after each equal radial angle extrusion for the next equal diameter angle extrusion. After equal diameter hot extrusion at 520? After 24 hours of solid solution, quenched into water at room temperature, at 210? Carry out artificial aging treatment for 5h. The room temperature hardness and high temperature heat resistance properties of the alloy are shown in Table 1.

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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...

Claims

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Application Information

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IPC IPC(8): C22F1/04
Inventor 肖代红杨太华
Owner CENT SOUTH UNIV
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