7075 Aluminum Plate T651 Aircraft
7075-t651 aluminum plate is a stress-relieved, high-strength material engineered for precision machining and load-bearing aircraft structural components.
Compared with standard 7075-T6 condition, the T651 temper undergoes controlled stress relief after solution heat treatment, significantly reducing residual internal stresses within thick plate sections. This minimizes distortion during heavy machining and ensures dimensional stability in complex, tight-tolerance parts.
As a result, 7075-T651 plate is widely used for aircraft frames, bulkheads, fittings, and other machined structural elements where strength, stiffness, and machining reliability are critical to structural integrity.
Chemical Composition of 7075 Aluminum Alloy (Typical, wt.%)
| Element | Content (%) |
|---|---|
| Zinc (Zn) | 5.6 – 6.1 |
| Magnesium (Mg) | 2.1 – 2.5 |
| Copper (Cu) | 1.2 – 1.6 |
| Chromium (Cr) | 0.18 – 0.28 |
| Iron (Fe) | ≤ 0.50 |
| Silicon (Si) | ≤ 0.40 |
| Manganese (Mn) | ≤ 0.30 |
| Titanium (Ti) | ≤ 0.20 |
| Aluminum (Al) | Balance |
Mechanical Properties of 7075 T651 Aluminum Plate
(Size: 30 × 1000 × 3000 mm, Actual Test Results)
| Property | Value |
|---|---|
| Tensile Strength (Rm) | 588 MPa |
| Yield Strength (Rp0.2) | 520 – 523 MPa |
| Elongation | 8.0 – 8.5 % |
| Brinell Hardness (HB) | 165 – 169 |
| Density | 2.81 g/cm³ |
| Elastic Modulus | 71 GPa |
Certification & Testing
Mill Test Certificate (EN 10204 3.1) available
Chemical composition and mechanical testing per applicable ASTM / AMS standards
Third-party inspection supported upon request
7075 T651 Plate size
| Alloy | Temper | Thickness (mm) | Width (mm) × Length (mm) |
|---|---|---|---|
| 7075 | T651 | 10 / 12 / 15 / 16 / 18 / 22 / 28 / 50 / 60 / 70 / 75 / 80 / 85 / 90 / 95 / 100 / 105 / 110 / 120 / 130 / 150 / 160 / 180 / 190 | 1000 x 3000 1500 × 3000 2000 × 4000 |
7075-T651 vs 7075-T6 Aluminum (Plate vs Sheet Focus)
| Comparison Item | 7075-T651 Aluminum Plate | 7075-T6 Aluminum Sheet |
|---|---|---|
| Typical product form | Thick rolled plate | Thin sheet / coil |
| Stress relief | Yes (stretched) | No |
| Thickness range | Medium to thick sections | Thin to medium |
| Machining stability | Excellent | Moderate |
| Distortion after machining | Low | Higher |
| Typical applications | Structural aircraft parts, machined components | Aircraft skins, formed panels |
| Cladding availability | Usually unclad | Commonly Alclad |
Typical Applications of Aircraft Grade 7075 T651 Aluminum Plate
7075-T651 aluminum plate is widely used in precision-machined, high-strength structural components, especially in industries where dimensional stability, strength, and reliability are critical.
1. Machined Aircraft Structural Components
Due to its stress-relieved condition, 7075-T651 is ideal for large-scale CNC machining. It is commonly used for:
Aircraft frames
Bulkheads
Structural ribs
Load-bearing brackets
The reduced internal stress ensures minimal deformation during heavy material removal, maintaining tight tolerances throughout machining.
2. Thick Plate Parts with Complex Geometry
7075-T651 performs exceptionally well in applications requiring:
Deep pocket machining
Multi-axis CNC processing
Complex structural geometries
Its uniform mechanical properties across thick sections make it suitable for high-precision aerospace components where consistency is critical.
3. High Load-Bearing Structural Parts
With strength levels comparable to some steels, 7075-T651 is widely used in:
Primary aircraft structures
Secondary support components
High-stress mechanical parts
It enables engineers to achieve high strength-to-weight ratio designs, which is essential in aerospace and high-performance engineering.
4. Precision Components Requiring Dimensional Stability
Because of its stress-relieved temper, 7075-T651 is preferred for parts that require:
Tight dimensional tolerances
High repeatability in machining
Minimal warping or distortion
Typical applications include:
Aerospace fittings
Precision mounts
Structural connectors
5. Replacement for 7075-T6 in Machined Parts
While 7075-T6 offers similar strength, 7075-T651 is more suitable for:
Precision-machined components
Large aluminum plate parts
Applications where post-machining deformation must be minimized
It is commonly selected as a more reliable material option for critical machined structures.
