7049 aluminum alloy

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Product information

Model: 7049
Availability: Customizable 
7049 aluminum alloy is a high-strength, corrosion-resistant, aerospace-grade lightweight material. Its core properties and application features are as follows:
Mechanical properties:
Tensile strength: In the T6 state, the tensile strength is ≥ 630 MPa, the yield strength is ≥ 570 MPa, the elongation is ≥ 6%, and the hardness is approximately 150-160 HB.
High-temperature stability: The strength retention rate at 200°C is ≥ 85%, and the strength retention rate remains above 80% after exposure to 150°C for 500 hours.
Fatigue performance: The 10⁷th fatigue limit σ-1 = 290 MPa (R = -1), with excellent dynamic characteristics.
Corrosion resistance:
Stress corrosion resistance: Significantly enhanced anti-stress corrosion cracking ability (KISCC ≥ 28 MPa·m¹/²) through T73 state treatment, suitable for corrosive environments such as the ocean.
Chemical composition optimization:
Low chromium content (≤ 0.12%) and trace additions of zirconium and titanium (forming nano-sized Al₃(Zr, Ti) dispersion) reduce directionality and enhance fracture toughness (KIC ≥ 32 MPa·m¹/²).
Processing and heat treatment:
Processing methods: Can be hot rolled, extruded, or cold worked for shaping, but welding requires preheating to 150-200°C to avoid cracks.
Heat treatment process: T6 state: Solution treatment (490-510°C) followed by water quenching, and aging treatment to enhance strength.
T73 state: Two-stage aging (e.g., 121°C × 8h + 177°C × 8.5h) to balance strength and toughness.
Overaging process: Strength continuously increases within 68 hours of aging at 120°C without showing overaging phenomena. 
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Chemical composition 
7049 aluminum alloy is a high-strength wrought aluminum alloy. Its chemical composition is precisely designed, and the content and functions of each element are as follows:
Main alloying elements
‌Zinc (Zn): 5.7% - 8.5%, it is the main strengthening element, forming the η (MgZn₂) strengthening phase with magnesium, significantly enhancing the strength, but excessive amounts will increase the stress corrosion sensitivity
‌Magnesium (Mg): 2.0% - 3.0%, it works in synergy with zinc for strengthening, directly influencing the effect of heat treatment aging hardening
‌Copper (Cu): 1.2% - 2.0%, it improves cutting performance and stress corrosion resistance, excessive amounts will reduce toughness
Trace added elements
‌Chromium (Cr): 0.05% - 0.25%, it refines grains and enhances stress corrosion resistance
‌Zirconium (Zr): 0.10% - 0.25% (added in some grades), it replaces part of chromium to optimize formability and recrystallization structure
‌Titanium (Ti): ≤ 0.06%, it forms nano-sized Al₃(Zr, Ti) particles with zirconium through microalloying, enhancing fracture toughness
Impurity control
‌Iron (Fe): ≤ 0.4% (aircraft grade requires ≤ 0.35%), excessive amounts will form AlFeSi phases, leading to brittleness
‌Silicon (Si): ≤ 0.3%, affects plasticity, needs strict control
‌Manganese (Mn): ≤ 0.10%, mainly affects surface treatment effects Special Requirements
Astronautical-grade materials impose stricter restrictions on residual elements such as titanium and nickel (e.g., Ti ≤ 0.05%)
Forgings produced by vacuum melting must have O₂ ≤ 3 ppm, with even lower impurity content
Different grades (such as 7049A) can be further optimized in terms of performance through microalloying adjustments (such as Zr-Ti composite) 
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