Overview
Al2024 (AA2024) is one of the most widely used high-strength aluminum alloys in the 2000 series aluminum family. Primarily alloyed with copper and magnesium, Al2024 is known for its exceptional fatigue resistance, high strength-to-weight ratio, and excellent structural performance.
Al2024 is extensively used in aerospace, defense, automotive, transportation, and high-performance engineering applications where lightweight structures and superior mechanical properties are critical.
Compared with Al2014, Al2024 generally offers better fatigue resistance and fracture toughness, making it one of the preferred materials for aircraft structures and highly stressed components.
Material Specification
| Property | Value |
|---|---|
| Alloy Designation | AA2024 |
| Alloy Series | 2000 Series |
| Main Alloying Elements | Copper, Magnesium |
| Material Type | High Strength Aerospace Aluminum Alloy |
| Density | 2.78 g/cm³ |
| Standard Forms | Plate, Sheet, Bar, Rod, Forgings, Extrusions |
Chemical Composition
| Element | Content (%) |
|---|---|
| Aluminum (Al) | Balance |
| Copper (Cu) | 3.8–4.9 |
| Magnesium (Mg) | 1.2–1.8 |
| Manganese (Mn) | 0.3–0.9 |
| Silicon (Si) | ≤0.50 |
| Iron (Fe) | ≤0.50 |
| Zinc (Zn) | ≤0.25 |
| Chromium (Cr) | ≤0.10 |
| Titanium (Ti) | ≤0.15 |
| Others | ≤0.15 Total |
Mechanical Properties
Typical T351 Condition
| Property | Value |
|---|---|
| Tensile Strength | 470 MPa |
| Yield Strength | 325 MPa |
| Elongation | 18–20% |
| Hardness | 120 HB |
| Elastic Modulus | 73 GPa |
| Fatigue Strength | 138 MPa |
Physical Properties
| Property | Value |
|---|---|
| Density | 2.78 g/cm³ |
| Melting Point | 500–638°C |
| Thermal Conductivity | 121 W/m·K |
| Electrical Conductivity | 30% IACS |
| Thermal Expansion Coefficient | 23.2 × 10⁻⁶/K |
| Specific Heat Capacity | 875 J/kg·K |
Corrosion Resistance
| Environment | Performance |
|---|---|
| Atmospheric Exposure | Fair |
| Marine Environment | Poor |
| Salt Spray Environment | Poor |
| Industrial Environment | Fair |
| Chemical Exposure | Fair |
Due to its high copper content, Al2024 has lower corrosion resistance than 5000 and 6000 series aluminum alloys. Cladding (Alclad), anodizing, chromate conversion coating, or painting are commonly used to improve corrosion protection.
International Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| AA (USA) | AA2024 |
| EN (Europe) | EN AW-2024 |
| DIN (Germany) | AlCuMg2 |
| JIS (Japan) | A2024 |
| ISO | AlCuMg2 |
| GB/T (China) | 2A12 |
| UNS | A92024 |
Available Tempers
| Temper | Description |
|---|---|
| T3 | Solution Heat Treated & Cold Worked |
| T351 | Solution Heat Treated, Stress Relieved |
| T4 | Solution Heat Treated & Naturally Aged |
| T6 | Artificially Aged |
| T851 | Stress Relieved & Artificially Aged |
Typical Applications
Aerospace Industry
- Aircraft Fuselage Structures
- Aircraft Wing Components
- Aircraft Skin Panels
- Aerospace Fasteners
- Structural Aircraft Parts
Defense Industry
- Military Vehicles
- Weapons Systems
- Structural Defense Components
Automotive Industry
- High-Performance Racing Components
- Suspension Parts
- Lightweight Structural Parts
Industrial Equipment
- High-Stress Machine Components
- Precision Fixtures
- Hydraulic Components
Transportation Industry
- Rail Components
- Heavy-Duty Structural Assemblies
Machining Characteristics
| Manufacturing Process | Rating |
|---|---|
| CNC Milling | Excellent |
| CNC Turning | Excellent |
| Drilling | Excellent |
| Tapping | Good |
| Threading | Good |
| Forging | Excellent |
| Welding | Poor |
| Sheet Metal Fabrication | Good |
| Bending | Fair |
| Anodizing | Good |
Advantages
Excellent Strength-to-Weight Ratio
Provides exceptional structural performance while remaining lightweight.
Outstanding Fatigue Resistance
One of the best aluminum alloys for cyclic loading applications.
Aerospace Proven Material
Widely used throughout the aerospace industry.
Excellent Machinability
Suitable for precision CNC machining and complex aerospace components.
Good Fracture Toughness
Performs well in demanding structural environments.
Heat Treatable
Mechanical properties can be optimized through heat treatment.
Limitations
Lower Corrosion Resistance
Requires protective finishing for harsh environments.
Poor Weldability
Generally not recommended for welded structures.
Higher Material Cost
More expensive than general-purpose aluminum alloys such as 6061.
Surface Protection Recommended
Often supplied as Alclad 2024 for aerospace applications.
Comparison with Other Aluminum Alloys
| Property | Al2024 | Al2014 | Al6061 | Al7075 | Al5052 |
|---|---|---|---|---|---|
| Strength | Very High | High | High | Extremely High | Medium |
| Fatigue Resistance | Excellent | Good | Good | Excellent | Good |
| Corrosion Resistance | Fair | Fair | Good | Fair | Excellent |
| Weldability | Poor | Poor | Good | Poor | Excellent |
| Machinability | Excellent | Excellent | Excellent | Excellent | Good |
| Structural Performance | Excellent | Excellent | Good | Excellent | Medium |
| Cost | High | Medium | Medium | High | Medium |
Comparison with Common Engineering Metals
| Material | Density (g/cm³) | Corrosion Resistance | Strength | Fatigue Resistance |
|---|---|---|---|---|
| Al2024 | 2.78 | Fair | Very High | Excellent |
| Al6061 | 2.70 | Good | High | Good |
| Al7075 | 2.81 | Fair | Extremely High | Excellent |
| Stainless Steel 304 | 7.93 | Excellent | Medium | Medium |
| Carbon Steel 1045 | 7.85 | Poor | High | Good |
| Titanium Grade 5 | 4.43 | Excellent | Very High | Excellent |
Recommended Surface Finishes
- Sulfuric Acid Anodizing
- Hard Anodizing
- Chromate Conversion Coating
- Alodine Treatment
- Chemical Film Coating
- Nickel Plating
- Zinc Plating
- Powder Coating
- Wet Painting
- Laser Marking
Frequently Asked Questions (FAQ)
What is Al2024 aluminum?
Al2024 is a high-strength copper-magnesium aluminum alloy designed for aerospace and structural engineering applications requiring excellent fatigue resistance and lightweight performance.
What is Al2024 used for?
Typical applications include:
- Aircraft Structures
- Aerospace Components
- Defense Equipment
- Racing Components
- Structural Engineering Parts
- Precision CNC Machined Components
Is Al2024 stronger than 6061?
Yes.
| Property | Al2024 | Al6061 |
|---|---|---|
| Tensile Strength | 470 MPa | 310 MPa |
| Yield Strength | 325 MPa | 276 MPa |
| Fatigue Resistance | Excellent | Good |
Al2024 provides significantly higher strength and fatigue performance than Al6061.
What is the difference between Al2024 and Al2014?
Al2024 offers better fatigue resistance and fracture toughness, while Al2014 generally provides slightly better machinability.
Is Al2024 suitable for CNC machining?
Yes. Al2024 offers excellent machinability and is widely used for aerospace precision machining.
Can Al2024 be welded?
Generally no. Welding is not recommended due to the risk of cracking and reduction in mechanical properties.
Does Al2024 anodize well?
Yes. Al2024 can be anodized, although color consistency may vary because of its copper content.
Is Al2024 corrosion resistant?
Al2024 has moderate corrosion resistance and usually requires anodizing, Alclad coating, or painting for outdoor applications.
Why is Al2024 popular in aerospace?
Because it combines:
- High Strength
- Excellent Fatigue Resistance
- Good Fracture Toughness
- Lightweight Performance
making it ideal for aircraft structures.
Does GCNOV provide custom manufacturing services for Al2024?
Yes. GCNOV provides:
- CNC Milling
- CNC Turning
- Aerospace Precision Machining
- Structural Components Manufacturing
- Surface Finishing
- Prototype Development
- Low-Volume Production
- Mass Production