7075 t73511

What is 7075-T73511 material?

7075 T73511 aluminum alloy is a high-strength wrought aluminum alloy and a member of the Al-Zn-Mg-Cu (7xxx series) alloy family. As a key material in the aerospace industry, 7075 T73511 holds an important position in high-strength structural applications due to its excellent comprehensive performance. The alloy is processed into the T73511 temper through specific heat treatment processes and manufacturing methods, achieving a balanced combination of strength, toughness, and corrosion resistance.

"T73511" is the heat treatment temper designation of the alloy, with the following meaning:

• "T" indicates heat-treated temper
• "73" indicates that after solution heat treatment, it has undergone overaging treatment to improve resistance to stress corrosion cracking
• "51" indicates stress relief by stretching, applicable to extruded products
• "1" indicates straightening after stretching

The T73511 temper is closely related to the T73510 temper, with the main difference being that T73511 allows straightening after stretching, while T73510 does not.

7075 T73511 material properties

• Excellent strength-to-weight ratio: tensile strength up to 510–570 MPa (74,000–82,700 psi) with a density of only 2.8 g/cm³, providing outstanding specific strength and a significant advantage in lightweight structural design
• Good toughness and fatigue resistance: with T73 treatment, it maintains high strength while providing good toughness and fatigue resistance, suitable for applications under cyclic loading
• Significant heat-treatment strengthening effect: through solution treatment and aging, strength can be increased by 3–4 times
• Good machinability: although more difficult to machine than many low-strength aluminum alloys, good surface quality and dimensional accuracy can be achieved through proper machining processes and parameter adjustments
• Excellent stress corrosion resistance: the T73 temper significantly improves resistance to stress corrosion cracking, making it suitable for a wider range of environmental conditions

7075 T73511 aluminum alloy also has certain limitations, such as relatively poor weldability, higher cost, and sensitivity to certain corrosive environments, which need to be addressed through proper design, processing, and surface treatment.

7075 T73511 chemical composition

7075 T73511 Aluminum Alloy Physical Properties

• Density: approximately 2.8 g/cm³, significantly lower than steel, giving it an excellent specific strength
• Melting point range: 480–635°C (890–1180°F)
• Thermal conductivity: approximately 130–155 W/m·K (750–1080 BTU-in/hr-ft²-°F)
• Specific heat capacity: approximately 0.88–0.96 J/g·K (0.21–0.23 BTU/lb-°F)
• Coefficient of thermal expansion: approximately 23.2 μm/m·K (13 μin/in-°F)

These physical properties allow 7075 T73511 aluminum alloy to maintain good stability even in high-temperature environments and to have excellent thermal conductivity, making it suitable for applications requiring lightweight construction and thermal management.

7075 T73511 Product Forms and Specifications

7075 T73511 Aluminum Plates

7075 T73511 aluminum plate is one of the most common product forms and has wide applications:

• Thickness range: typically 0.3–400 mm (0.012–15.75 inches), customizable as required
• Width range: commonly 100–2200 mm (3.94–86.6 inches), standard widths include 1250, 1500, 1520, 2000 mm, etc.
• Length range: typically 2500–4000 mm (98.4–157.5 inches), customizable
• Typical dimensions: 0.250 in × 48.500 in × 144.500 in (0.635 × 1232 × 3670 mm), 3.5 in × 48.500 in × 144.500 in (88.9 × 1232 × 3670 mm), etc.
• Surface finish: available as bare plate, anodized, painted, or Alclad-coated to enhance corrosion resistance

7075 T73511 aluminum plates are mainly used in aerospace structural components, high-strength molds, automotive parts, and other demanding applications.

7075 T73511 Aluminum Bars

7075 T73511 aluminum bars are another important product form, offering excellent strength and machinability:

• Diameter range: 3–550 mm (0.12–21.65 inches)
• Length range: typically 1–6 meters (3.28–19.69 feet), customizable
• Product types: including round bars, square bars, hexagonal bars, and rectangular bars
• Cold-finished condition: available in cold-finished (CF) condition for improved dimensional accuracy and surface quality

Typical 7075 T73511 round bar sizes include:

• 5/8 inch (15.88 mm)
• 3/4 inch (19.05 mm)
• 7/8 inch (22.23 mm)
• 1 inch (25.4 mm)
• 1-1/4 inch (31.75 mm)
• 1-1/2 inch (38.1 mm), etc.

7075 T73511 aluminum bars are widely used in aircraft fittings, gears and shafts, fuse parts, instrument shafts and gears, regulating valve components, worm gears, and other fields.

7075 T73511 Extruded Products

7075 T73511 aluminum alloy is also widely used in extruded products, including:

• Extruded rods: diameter typically 0.25–4 inches (6.35–101.6 mm)
• Extruded tubes: wide range of outer diameters, wall thickness customizable
• Extruded profiles: including various structural shapes such as angles, channels, I-beams, etc.
• Rectangular bars: common sizes such as 0.5 × 1.5 inches (12.7 × 38.1 mm), 1 × 1.5 inches (25.4 × 38.1 mm), etc.

Extruded products usually have excellent longitudinal strength and uniform microstructure, making them suitable for structural applications requiring complex shapes and high strength.

7075 T73511 Special Product Forms

In addition to the above main product forms, 7075 T73511 aluminum alloy is also available in the following special forms:

• Wire and rod stock: diameter typically 0.1–20 mm (0.004–0.787 inches)
• Forgings: including ring forgings, disk forgings, etc., for high-stress applications
• Cold-worked products: such as cold-finished bars with higher dimensional accuracy and surface quality
• Powder metallurgy products: for high-performance applications with special requirements

These special product forms provide design engineers with greater flexibility to meet a wide range of complex engineering needs.

7075 T73511 Aluminum Surface Treatments

To improve the corrosion resistance and appearance quality of 7075 T73511 aluminum alloy, various surface treatments can be applied:

• Anodizing: forms an oxide layer on the aluminum surface to improve corrosion resistance and wear resistance, typically 5–25 μm thick
• Painting: applies an organic coating to provide additional corrosion protection and decorative effects
• Alclad coating: cladding 7075 aluminum alloy with a layer of pure aluminum or aluminum alloy to significantly enhance corrosion resistance
• Chemical conversion coating: such as chromate or non-chromate treatments, to improve paint adhesion and short-term protection
• Mechanical finishing: including sandblasting, polishing, brushing, etc., to improve surface smoothness and appearance

These surface treatments not only enhance the corrosion resistance of the material but also improve its wear resistance, lubricity, and appearance, broadening the application range of 7075 T73511 aluminum alloy.

7075 T73511 Aluminum Corrosion Resistance

• Basic Corrosion Resistance 7075 T73511 aluminum alloy, in an untreated condition, has a moderate level of corrosion resistance, but its T73 temper significantly enhances resistance to stress corrosion cracking, making it suitable for a wider range of environmental conditions.
• Stress Corrosion Cracking Performance 7075 T73511 aluminum alloy, through T73 treatment, exhibits excellent performance against stress corrosion cracking (SCC). By extending the overaging time, T73 treatment significantly improves SCC resistance, which is its main advantage over T6 temper.

Measures to Improve Corrosion Resistance

To further enhance the corrosion resistance of 7075 T73511 aluminum alloy, the following measures can be taken:

By comprehensively applying these measures, 7075 T73511 aluminum alloy can maintain good corrosion resistance in various harsh environments, meeting the demands of aerospace, marine, and other high-performance applications.

7075 T73511 Application Scenarios: Diverse Engineering Uses

7075 T73511 Aluminum in Aerospace Applications

Leveraging its excellent strength-to-weight ratio and corrosion resistance, 7075 T73511 aluminum alloy is widely used in the aerospace field:

Aircraft Structural Components

• Wing Structures: 7075 T73511 is used to manufacture wing skins, ribs, spars, and other components, providing the necessary strength and stiffness while reducing weight
• Fuselage Structures: Used in fuselage frames, bulkheads, and skins to bear flight loads and ensure structural integrity
• Tail Structures: Used in horizontal and vertical tail components to ensure flight stability and maneuverability

Landing Gear Systems

• Main landing gear and nose landing gear components such as struts, links, and brackets, which bear landing and taxi loads
• 7075 T73511 is used in landing gear doors and related structural parts

Interiors and Decorative Parts

• Aircraft interior panels, luggage racks, and other non-structural parts, utilizing its good machinability and surface quality
• High-precision instrument panels and interior components, making use of the dimensional stability and machining accuracy of 7075 T73511

Aero Engine Components

• Engine mounting brackets and pylons, which bear engine weight and vibration loads
• Non-hot-end components such as parts of the intake and exhaust systems

Typical aerospace applications of 7075 T73511 aluminum alloy include advanced aircraft designs such as the Boeing 787 Dreamliner and Airbus A350. Its T73 temper provides an excellent balance of strength, toughness, and corrosion resistance, meeting the stringent requirements of aerospace applications.

What Other Fields Use 7075 T73511?

• The T73 temper of 7075 T73511 aluminum alloy is particularly suited for military applications, as it offers excellent stress corrosion resistance while maintaining high strength, ensuring reliable performance in harsh battlefield environments
• Industrial and civilian applications of 7075 T73511 aluminum alloy continue to expand, especially in fields requiring lightweight, high strength, and reliability—such as high-performance automobiles, sporting equipment, and precision machinery—where its excellent comprehensive properties offer a significant competitive advantage