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Heat-resistant and corrosion-resistant 2219 aluminum alloy and preparation method thereof

A corrosion-resistant and aluminum alloy technology, applied in the field of heat-resistant and corrosion-resistant 2219 aluminum alloy and its preparation, can solve problems such as restricting development

Active Publication Date: 2021-06-22
江苏国鑫铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, so far, there is no 2219 aluminum alloy with independent intellectual property rights that takes into account strength, heat resistance and corrosion resistance, which restricts the development of my country's aerospace, weaponry and other industries to a certain extent.

Method used

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  • Heat-resistant and corrosion-resistant 2219 aluminum alloy and preparation method thereof
  • Heat-resistant and corrosion-resistant 2219 aluminum alloy and preparation method thereof
  • Heat-resistant and corrosion-resistant 2219 aluminum alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A heat-resistant and corrosion-resistant 2219 aluminum alloy, its preparation method:

[0030] First, put pure Al, Al-Cu, Al-Sr, Al-Zr, Al-Ti-B and Al-Mn intermediate alloys in a resistance wire melting furnace, set the temperature at 900±10°C, keep it warm for 1h after melting, and then cool down Add pure Zn to 750±10°C. Next, keep warm for 1.5~2h. After all the intermediate alloys and metals are melted, adjust the temperature to 760±10°C, add hexachloroethane once to degas until no gas escapes, let it stand for 15 minutes, and then add hexachloroethane The alkane is degassed twice until no gas escapes. After standing for 15 minutes, the slag is removed and poured into a metal mold preheated to 400±10°C to cast into an ingot. Finally, homogeneous annealing at 525±10°C×24h, preheating and heat preservation at 380±10°C for 2h, hot extrusion at an extrusion ratio of 6-8 (the best is 7), solid solution at 535±10°C×3h, Warm water quenching at 60±5°C, aging treatment at 19...

Embodiment 2

[0034] The preparation method of this example is the same as that of Example 1, except that the components are different. The actual composition of the new heat-resistant and corrosion-resistant 2219 aluminum alloy of this example is as measured by EDS: 6.50%Cu, 0.35%Mn, 0.09 %Zn, 0.09%Sr, 0.18%Zr, 0.48%Ti, the balance is aluminum and impurity elements.

[0035] The new heat-resistant and corrosion-resistant 2219 aluminum alloy of this embodiment has a tensile strength of 360.42 MPa, a stress peak value of 250.76 MPa in a thermal compression test at 250° C., and a maximum intergranular corrosion depth of 180.56 mm.

Embodiment 3

[0037] The preparation method of this example is the same as that of Example 1, except that the components are different. The actual composition of the new heat-resistant and corrosion-resistant 2219 aluminum alloy of this example is as measured by EDS: 6.90%Cu, 0.45%Mn, 0.12 %Zn, 0.11%Sr, 0.22%Zr, 0.50%Ti, the balance is aluminum and impurity elements.

[0038] The new heat-resistant and corrosion-resistant 2219 aluminum alloy of this embodiment has a tensile strength of 368.42 MPa, a stress peak value of 254.76 MPa in a thermal compression test at 250° C., and a maximum intergranular corrosion depth of 182.56 mm.

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Abstract

A new type of heat-resistant and corrosion-resistant 2219 aluminum alloy and its preparation method are characterized in that: it is mainly composed of aluminum, copper, manganese, zinc, strontium, zirconium and titanium. The preparation method includes: first, placing pure Al, Al-Cu, Al-Sr, Al-Zr, Al-Ti-B and Al-Mn master alloys in a resistance wire melting furnace for smelting, keeping the temperature for 1 hour and then cooling down to Add pure Zn at 750°C; secondly, keep the temperature for 1.5~2h, after all the master alloys and metals are melted, adjust the temperature to 760±10°C, add hexachloroethane for degassing once, and then add hexachloroethane after standing for heat preservation Secondary degassing, standing for heat preservation, then removing slag and pouring into a metal mold preheated to 400±10℃ to cast into an ingot; finally, performing homogenization annealing-hot extrusion-solid solution-quenching-aging treatment. The aluminum alloy of the invention has good corrosion resistance and heat resistance, and can greatly meet the manufacturing requirements of aluminum alloy structural parts in high temperature service.

Description

technical field [0001] The invention relates to an aluminum alloy modification technology, in particular to a modification technology for a 2219 aluminum alloy material, in particular to a heat-resistant and corrosion-resistant 2219 aluminum alloy and a preparation method thereof. Background technique [0002] At the beginning of the 20th century, German Wilm discovered that the Al-Cu-Mg alloy would harden during aging. After that, this type of alloy was widely used in various aviation industries in the world. After the 21st century, 2424, 2524 and 2618 aluminum alloys with excellent performance in all aspects were invented, which were widely used in heat-resistant structural parts of key parts such as aerospace, firearms and artillery, such as cylinder heads and pistons of aero-engines , aircraft surface skin. [0003] With the continuous development of my country's large aircraft and manned spaceflight, 2xxx aluminum alloys have attracted the attention of various domestic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/18C22C1/03C22C1/06C22F1/057
CPCC22C1/026C22C1/03C22C1/06C22C21/18C22F1/002C22F1/057
Inventor 许晓静庄园张进松张斌刘正张日凯金啸鹏张鹏韦宏博
Owner 江苏国鑫铝业有限公司