Klíčové informace
- 7075 is one of the highest-strength aluminum alloys available, with tensile strength up to 572 MPa in T6 temper.
- Its zinc-rich composition delivers exceptional strength-to-weight ratio for aerospace and defense applications.
- Good machinability allows intricate designs and precision manufacturing.
- Available in multiple tempers (O, T6, T651, T73) to match different strength and stress-corrosion requirements.
- Corrosion resistance is moderate — surface treatment may be needed for harsh environments.
Úvod
Hliník 7075 plate is a top choice for applications requiring maximum strength in a lightweight package. It is widely used in aerospace, defense, and high-performance automotive industries. This guide covers its properties, typical applications, and how it compares to other alloys — so you can determine whether 7075 plate is the right material for your project.
Pochopení vlastností hliníkového plechu 7075
7075 hliníkový plech stands out for its exceptional strength, good machinability, and moderate corrosion resistance. It is heat-treatable and available in several tempers, each offering a different balance of strength, toughness, and stress-corrosion resistance.
Chemical Composition of 7075 Aluminum Plate
The strength of 7075 comes from its zinc, magnesium, and copper content. The alloy conforms to AMS specifications and ASTM B209 standards.
| Prvek | Složení (%) |
|---|---|
| Al | 87.1 – 91.4 (Remainder) |
| Zn | 5.1 - 6.1 |
| Mg | 2.1 - 2.9 |
| Cu | 1.2 - 1.8 |
| Cr | 0.18 - 0.28 |
| Si | ≤ 0.40 |
| Fe | ≤ 0.50 |
| Mn | ≤ 0.30 |
| Ti | ≤ 0,20 |
Mechanical Properties of 7075-T6 Aluminum Plate
The T6 temper is the most common for 7075 plate. It delivers the alloy’s maximum strength:
| Majetek | 7075-T6 |
|---|---|
| Pevnost v tahu (MPa) | 572 |
| Mez kluzu (MPa) | 503 |
| Pevnost ve smyku (MPa) | 331 |
| Prodloužení (%) | 11 |
| Tvrdost (Brinell) | 150 |
For applications requiring better stress-corrosion cracking resistance, the T73 temper offers a good alternative at a modest strength reduction. See our 7075 T73 properties guide for details.
Why 7075 Aluminum Is Preferred in High-Stress Applications
7075 plate meets strict AMS specifications for aerospace use. Its strength-to-weight ratio is among the best of any aluminum alloy, allowing engineers to design lighter structures without sacrificing load capacity. This translates directly to fuel savings in aircraft and vehicles.
Beyond aerospace, 7075 plate is used in mold making, military equipment, and high-stress automotive components like gears and shafts.
Aplikace hliníkových desek 7075
The aerospace industry is the largest consumer of 7075 plate. Typical applications include:
- Wing spars and fuselage panels
- Landing gear components
- Structural brackets and fittings
In automotive manufacturing, 7075 plate appears in performance parts where weight reduction and high strength are both critical. The defense industry uses it for armor plates and weapon components. For forming applications, Plochá tyč z hliníku 7075 and other shapes are also available.
Comparing 7075 to Other Alloys
| Majetek | 7075-T6 | 6061-T6 |
|---|---|---|
| Pevnost v tahu (MPa) | 572 | 310 |
| Mez kluzu (MPa) | 503 | 276 |
| Odolnost proti korozi | Mírná | Dobrý |
| Obrobitelnost | Dobrý | Vynikající |
| Svařitelnost | Špatný | Vynikající |
| Náklady | Vysoká | Střední |
7075’s strength is nearly double that of 6061, but 6061 offers better weldability and corrosion resistance at a lower cost. For a detailed analysis, see our 6061 vs 7075 comparison guide. For a comparison with another 7xxx series alloy, see our 7050 vs 7075 guide.
Závěr
7075 aluminum plate offers the highest strength of any commonly available aluminum alloy, making it the standard choice for aerospace, defense, and high-performance applications. The trade-off: it costs more than 6061, is difficult to weld, and has moderate corrosion resistance that may require surface treatment in harsh environments. If your project demands maximum strength in a lightweight package, 7075 plate is worth the premium.
Linsy Aluminum supplies 7075 plate in O, T6, T651, and T73 tempers, with customization available for dimensions and surface finishes. Typical lead times are 10–60 days depending on alloy temper, thickness, and processing requirements. Contact Linsy Aluminum to discuss your 7075 plate specifications.
ČASTO KLADENÉ DOTAZY
V jakých odvětvích se obvykle používají hliníkové plechy 7075?
7075 plate is primarily used in aerospace (wing spars, fuselage panels, landing gear), defense (armor, weapon components), automotive (performance parts, gears), and sporting goods (bicycle frames, climbing equipment). Its high strength-to-weight ratio makes it the preferred choice where weight savings directly impact performance.
What temper should I choose for 7075 aluminum plate?
T6 offers maximum strength (572 MPa tensile). T651 is stress-relieved for better dimensional stability during machining. T73 sacrifices some strength for significantly improved stress-corrosion cracking resistance — preferred for aerospace structural parts exposed to corrosive environments.
How does the cost of 7075 compare to 6061?
7075 costs significantly more than 6061 due to its zinc-rich composition and more complex processing. However, its strength is nearly double, meaning less material may be needed for the same load-bearing capacity. For applications where strength is critical, 7075 often delivers better value per unit of performance.
Can 7075 aluminum plate be welded?
Welding 7075 is not recommended with conventional arc welding due to hot cracking risk. Friction stir welding (FSW) is the preferred method. For most applications, mechanical fastening or riveting is used instead. See our 7075 welding guide for details.
Does 7075 aluminum plate need surface treatment?
7075’s copper content makes it more susceptible to corrosion than 6xxx series alloys. In harsh or marine environments, anodizing or protective coating is recommended. In dry, indoor environments, 7075 typically performs well without additional treatment.
