7055 aluminum alloy

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Product information

Model: 7055
Availability: Customizable 
7055 aluminum alloy is a type of ultra-high strength aluminum alloy, featuring excellent mechanical properties, corrosion resistance, and heat treatment strengthening characteristics. It is widely used in aerospace, automotive manufacturing, and military equipment fields. The following is a detailed analysis of its main properties: Mechanical properties
High-strength: Yield strength up to 500 MPa, tensile strength can reach 570-640 MPa, approaching the level of high-strength steel.
Ductility: Extension rate 12-15%, maintaining high strength while having good plasticity.
Anti-fatigue property: Can maintain strength and elasticity after multiple cycles of load, with excellent durability.
Hardness: Can reach 150-160 HB, with good wear resistance.
Compression performance: Outstanding compressive performance, capable of withstanding large pressure. Corrosion resistance
Temperature resistance at normal temperature: Resistant to water, alkali and weak organic acids, performs well against weak corrosive media such as hydrochloric acid and sulfuric acid.
High-temperature resistance: Anti-oxidation, thermal corrosion and sulfur-containing gas erosion, suitable for high-temperature environments.
Electrochemical corrosion resistance: Has good resistance to electrochemical corrosion media such as seawater.
Heat treatment properties
T6 treatment: Significantly enhances strength and hardness through solution treatment and aging, improving tensile and fatigue resistance.
T7 treatment: Further artificial aging on the basis of T6 treatment, increasing strength and corrosion resistance.
T76 treatment: Complex process can achieve high strength, high toughness and good impact performance.
Non-isothermal aging: Optimized process can shorten aging time and improve mechanical properties.
Strengthening mechanisms
Dislocation strengthening: Introduce dislocations through plastic deformation (such as rolling, multi-directional forging) to enhance strength.
Fine grain strengthening: After deformation, the grain becomes finer, such as in multi-directional forging where the grain size is reduced to 5.3 μm.
Solid solution aging strengthening: The precipitation of MgZn₂ phase and Al₂CuMg phase after heat treatment contributes to strengthening.
Typical applications
Aerospace: Aircraft fuselage structure, landing gear struts, large-capacity fuel tanks
Automobile manufacturing: Body frame, lightweight components
Military equipment: High-strength corrosion-resistant structural components
In summary, 7055 aluminum alloy, with its comprehensive performance advantages, has become one of the key materials in the high-end industrial field.

Product parameter

Chemical composition

7055 aluminum alloy is a high-strength wrought aluminum alloy. Its chemical composition mainly consists of aluminum (in excess), zinc (7.5-8.5%), magnesium (1.8-2.8%), copper (1.8-2.5%), and contains trace amounts of iron, silicon, manganese, chromium, titanium, zirconium, etc. 

Detailed chemical composition of 7055 aluminum alloy
According to the national standard GB/T 3190-2020 and industry data, the chemical composition (mass fraction %) of 7055 aluminum alloy is as follows:
Main components
Aluminum (Al): in excess
Zinc (Zn): 7.5-8.5%
Magnesium (Mg): 1.8-2.8%
Copper (Cu): 1.8-2.5%
Limitations for trace impurities
Iron (Fe): ≤0.15%
Silicon (Si): ≤0.1%
Manganese (Mn): ≤0.05%
Chromium (Cr): ≤0.04%
Titanium (Ti): 0.01-0.05%
Zirconium (Zr): 0.08-0.2%
Other individual impurities: ≤0.1%
Total other impurities: ≤0.15%
Element functions and standard basis
Zinc, magnesium, and copper: As main alloying elements, they significantly enhance strength and optimize mechanical properties through aging hardening.
Zirconium and titanium: Fine-grain structure, improving corrosion resistance and thermal stability.
Reference standard: GB/T 3190-2020 clearly defines the chemical composition range of this alloy, applicable to high-strength applications such as aerospace. 
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