A medium-strength stress-corrosion-resistant aluminum-based material and its preparation method

An aluminum-based material and stress-resistant technology, applied in the field of metal materials, can solve the problems of neglecting stress corrosion resistance, low strength and rigidity, and difficult to meet the needs of high-strength and high-rigidity lightweight materials, and achieve good stress corrosion resistance. Effects of properties, high strength and elastic modulus

Active Publication Date: 2022-03-15
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Application Information

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Problems solved by technology

[0007] At this stage, corrosion-resistant aluminum alloys are still the main lightweight materials with good stress corrosion resistance, but their strength and stiffness are low, and it is difficult to meet the demand for high-strength and high-rigidity lightweight materials in complex corrosion environments
However, most of the reinforced aluminum-based materials focus on high strength, ignoring the stress corrosion resistance performance, resulting in the inability to meet the needs of corrosive environments.

Method used

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  • A medium-strength stress-corrosion-resistant aluminum-based material and its preparation method
  • A medium-strength stress-corrosion-resistant aluminum-based material and its preparation method
  • A medium-strength stress-corrosion-resistant aluminum-based material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0032] AlZn 3.9 Mg 1.9 mn 0.3 Zr 0.1 Cr 0.1 The alloy is used as the matrix, and silicon carbide with an average particle size of 5 μm is used as the reinforcing particles to prepare aluminum-based materials. The preparation process is as follows:

[0033] ① After weighing aluminum ingots, magnesium ingots, zinc ingots, and aluminum-based intermediate alloy ingots in proportion, alloy powders were prepared using a supersonic gas atomization furnace, and alloy fine powders of -200 mesh (≤71 μm) were obtained after sieving. The chemical composition of the alloy powder was tested, and the results are shown in Table 1.

[0034] ②Place silicon carbide particles with an average particle size of 5 μm at a temperature of 160°C for 7 hours, and then mix with AlZn 3.9 Mg 1.9 mn 0.3 Zr 0.1 Cr 0.1 Alloy fine powder is added in proportion to the mechanical mixer, the volume percentage of silicon carbide is 14% of the matrix, the rotation speed is 60r / min, and lasts for 120min. Pu...

Embodiment 2

[0049] AlZn 4.7 Mg 1.5 mn 0.4 Zr 0.1 Cu 0.2 The alloy is used as the matrix, and silicon carbide with an average particle size of 5 μm is used as the reinforcing particles to prepare aluminum-based materials. The preparation process is as follows:

[0050] ① After weighing aluminum ingots, magnesium ingots, zinc ingots, and aluminum-based intermediate alloy ingots in proportion, alloy powders were prepared using a supersonic gas atomization furnace, and alloy fine powders of -200 mesh (≤71 μm) were obtained after sieving. The chemical composition of the alloy powder was tested, and the results are shown in Table 4.

[0051] ② Put silicon carbide particles with an average particle size of 5 μm at a temperature of 170 ° C for 5 h, and then mix with AlZn 4.7 Mg 1.5 mn 0.4 Zr 0.1 Cu 0.2 Alloy fine powder is added in proportion to the mechanical mixer, the volume percentage of silicon carbide is 13.5% of the matrix, the rotation speed is 30r / min, and lasts for 180min. Put...

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Abstract

The invention relates to a medium-strength stress-corrosion-resistant aluminum-based material and a preparation method thereof. The material is made of AlaZnbMgcMndZreXf alloy as matrix, micron silicon carbide particles as reinforcement, and is prepared by rapid solidification / powder metallurgy and appropriate heat treatment process. The material has a tensile strength of over 410MPa, a specified plastic elongation strength of over 340MPa, a tensile elastic modulus of over 80GPa, and a stress corrosion resistance life of over 1100min. Compared with traditional corrosion-resistant aluminum alloys, the strength and modulus of the material of the present invention are higher, and the stress corrosion resistance life can meet the requirements of lightweight and high-mobility improvement and upgrade of corresponding structural components of shipboard and airborne equipment in specific marine corrosion environments It belongs to a new type of medium-strength stress-corrosion-resistant lightweight material.

Description

technical field [0001] The invention relates to a medium-strength stress-corrosion-resistant aluminum-based material and a preparation method thereof, belonging to the field of metal materials. Background technique [0002] Composite materials usually have good designability, and can optimize the required performance by adjusting the composition and preparation process, so as to obtain materials with different mechanical properties and physical properties, and can realize different structural materials, functional materials or structure-function integration Preparation of materials. Composite materials prepared with metal as the matrix can improve the strength, hardness, modulus, thermal expansion and wear resistance of the matrix material by adding reinforcements such as second phase particles / fibers with excellent performance while maintaining the good plasticity and toughness of the metal , thermal conductivity, electrical conductivity and other aspects of performance. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C21/10C22C32/00C22F1/053
CPCC22C1/05C22C21/10C22C32/0063C22F1/053
Inventor 唐鹏钧李沛勇王兴元杨光耀杨斌王少华
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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