7085 aluminum alloy

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Product information

Material: 7085
Availability: Customizable 
7085 aluminum alloy belongs to the Al-Zn-Mg-Cu series of ultra-high strength wrought aluminum alloys, featuring high strength, low density, good corrosion resistance and fatigue resistance. It is widely used in key load-bearing components of aerospace.
‌Material Characteristics and Application Positioning‌
7085 aluminum alloy is the fourth generation high-strength and high toughness wrought aluminum alloy. It is composed of zinc, magnesium, and copper as the core strengthening elements, combined with micro-alloying components such as zirconium and titanium. While maintaining a low density (≈2.78 g/cm³), it achieves a balance between high strength (tensile strength ≥ 600 MPa) and high toughness. As a key material in the aerospace field, its typical applications include aircraft wing panels, missile structural compartments, and fuselage crossbars, which are high-load-bearing components.
‌Core Physical and Mechanical Properties‌
‌Basic Physical Characteristics‌
Density: 2.78 - 2.82 g/cm³ (about 1/3 of steel)
Heat conductivity: 130 - 140 W/(m·K).
Linear expansion coefficient: 23.6×10⁻⁶/K (20 - 100℃)
‌Mechanical Performance Characteristics (Typical Heat Treatment State)
T6 state (solution treatment + artificial aging): Tensile strength ≥ 600 MPa
Yield strength ≥ 545 MPa
Elongation 6 - 8%
Two-stage aging state (T74): Tensile strength 546 - 563 MPa
Yield strength 426 - 437 MPa
Elongation longitudinal 15.3%, transverse 9.5% (reflecting anisotropy)
‌Chemical Composition Optimization‌
‌Core Element Ratio: Zinc (7.0 - 8.0%): Dominantly forms MgZn₂ aging strengthening phase
Magnesium (1.2 - 1.8%): Collaborates with Zn to enhance precipitation strengthening effect
Copper (1.3 - 2.0%): Improves high-temperature stability and forms Al₂Cu phase
‌Microalloying Elements: Zirconium (0.08 - 0.15%): Generates Al₃Zr nanoparticles to inhibit recrystallization
The zinc-magnesium ratio is strictly controlled at 4.5 - 5.0:1 to optimize strength-toughness matching 
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Chemical composition

The main composition of 7085 aluminum alloy is the Al-Zn-Mg-Cu system. The typical composition range is Zn 7.0-8.0%, Mg 1.2-1.8%, Cu 1.3-2.0%, and it also contains trace elements such as Zr and Ti. The specific composition may vary slightly depending on the standard or process.
‌Core composition range‌
7085 aluminum alloy, as an ultra-hard aluminum alloy of the Al-Zn-Mg-Cu system, has the following core composition design:‌
‌Main alloy elements‌. Zinc (Zn): 7.0-8.0%, mainly forming the MgZn₂ strengthening phase
Magnesium (Mg): 1.2-1.8%, synergistically enhancing the aging strengthening effect
Copper (Cu): 1.3-2.0%, improving high-temperature stability and machining performance
‌Micro-alloying elements‌. Zirconium (Zr): 0.08-0.15%, refining the grains through Al₃Zr particles
Titanium (Ti)/Chromium (Cr): ≤0.06%, assisting in grain control.
‌Impurity control‌. Iron (Fe) ≤0.08%, Silicon (Si) ≤0.06%, ensuring material purity
‌Typical composition examples‌
According to authoritative research data, the specific composition of 7085 aluminum alloy may present the following variations:‌
Al-7.5Zn-1.6Mg-1.7Cu-0.11Zr (hot-rolled plate composition)
Al-7.48Zn-1.51Mg-1.42Cu-0.15Zr (experimental alloy composition)
‌Standard reference‌
The Chinese national standard GB/T 3190-2008 stipulates the composition range of 7085 as follows:‌
Zn: 7.0-8.0%
Mg: 1.2-1.8%
Cu: 1.3-2.0%
Zr: 0.08-0.15% 
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