Description
Aluminium Alloy 7075 T651 Plate
Aluminium 7075 T651 Plate is a high-strength Aerospace Grade alloy known for its excellent mechanical properties and superior resistance to stress corrosion cracking. It belongs to the 7xxx series (Al-Zn alloys) and is widely used where strength is critical.
The T651 temper indicates that the material is:
• Solution heat-treated
• Stress-relieved by stretching
• Artificially aged
This results in enhanced dimensional stability and reduced internal stress, making it ideal for machining.
7075 T651 Chemical Composition :
| Element | Percentage (%) |
|---|---|
| Zinc (Zn) | 5.1 – 6.1 |
| Magnesium (Mg) | 2.1 – 2.9 |
| Copper (Cu) | 1.2 – 2.0 |
| Chromium (Cr) | 0.18 – 0.28 |
| Silicon (Si) | ≤ 0.40 |
| Iron (Fe) | ≤ 0.50 |
| Aluminium (Al) | Balance |
Mechanical Properties of 7075 T651 :
| Property | Value |
| Tensile Strength | ~572 MPa |
| Yield Strength | ~503 MPa |
| Elongation | 11% |
| Hardness | ~150 HB |
| Density | 2.81 g/cm³ |
Key Features of 7075 T651 Aluminium :
• High strength-to-weight ratio
• Excellent fatigue resistance
• Good machinability
• Stress-relieved (T651 temper)
• Moderate corrosion resistance
• Suitable for precision components
Applications of 7075 T651 Aluminium
7075 T651 aluminium is widely used in:
• Aerospace Components (wings, fuselage structures)
• Defense and Military Equipment
• Automotive Racing Parts
• Tooling and Fixtures
• Mold making and Precision Engineering
• Marine and High-Performance Applications
Heat Treatment of 7075 T651
The T651 temper involves:
• Solution heat treatment
• Quenching
• Stress relieving (stretching)
• Artificial ageing
This process improves:
• Mechanical strength
• Dimensional stability
• Crack resistance
Available Forms of 7075 T651 :
• Round Bars
• Plates
• Sheets
• Flats
• Blocks
• Custom-cut sizes
Advantages of 7075 T651 :
• One of the strongest aluminium alloys available
• Lightweight compared to steel
• Excellent for high-load applications
• Good machinability for CNC operations
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Questions People generally ask :
Q1: What is T651 in 7075 aluminium?
• T651 indicates that the alloy is heat-treated, stress-relieved, and artificially aged for improved stability.
Q2: Is 7075 T651 stronger than steel?
• It has a very high strength-to-weight ratio, making it comparable to some steels in strength but much lighter.
Q3: Can 7075 T651 be welded?
• It is not recommended due to cracking issues.
Q4: Where is 7075 T651 used?
• It is mainly used in aerospace, defense, and high-performance engineering applications.
