What is 5083 (5083-H116 Aluminum Alloy)?
5083-H116 Aluminum Alloy is a high-performance al-mg alloy widely used in aerospace, automotive, marine, and general engineering applications. This comprehensive guide covers its chemical composition, mechanical properties, machining characteristics, and practical applications per ASTM/GB standards.
Chemical Composition (ASTM B209/B211)
| Element | Content (%) | Specification |
|---|---|---|
| Aluminum (Al) | Balance | ASTM B209 |
| Magnesium (Mg) | 0.8-1.2% | ASTM B209 |
| Silicon (Si) | 0.4-0.8% | ASTM B209 |
| Copper (Cu) | ≤0.15% | ASTM B209 |
| Chromium (Cr) | 0.04-0.35% | ASTM B209 |
| Iron (Fe) | ≤0.7% | ASTM B209 |
Mechanical Properties (T6 Temper)
| Property | Value | Standard |
|---|---|---|
| Tensile Strength | ≥310 MPa | ASTM B209 |
| Yield Strength (0.2% offset) | ≥276 MPa | ASTM B209 |
| Elongation | ≥12% (in 50mm) | ASTM B209 |
| Hardness | 95 HRB | ASTM E18 |
| Density | 2.70 g/cm³ | ASTM B479 |
| Melting Point | 580-650°C | – |
Key Features
- High strength-to-weight ratio: Excellent mechanical properties with low density
- Good corrosion resistance: Natural oxide layer provides protection
- Excellent machinability: Easy to machine with high speeds and feeds
- Good weldability: Can be welded by TIG, MIG, and resistance welding
- Anodizable: Takes anodizing well for enhanced corrosion resistance and color
- Non-magnetic: Suitable for electrical and electronic applications
- Recyclable: 100% recyclable with low energy consumption
Common Applications
- Aerospace: Aircraft structures, wing ribs, fuselage frames, landing gear components
- Automotive: Wheels, suspension components, engine parts, body panels
- Marine: Boat hulls, masts, railings, marine hardware
- Bicycle frames: High-performance mountain bikes and road bikes
- Electronics: Heat sinks, enclosures, chassis, brackets
- Sports equipment: Golf club heads, baseball bats, camping gear
- Industrial: Machine parts, jigs, fixtures, conveyor components
CNC Machining Guidelines
Tool Selection
- Tool material: Carbide or high-speed steel (HSS) for general machining
- Tool geometry: Positive rake angle (10-20°), relief angle (8-12°)
- Nose radius: 0.4-0.8mm for finishing, 0.8-1.2mm for roughing
- Coating: Uncoated or TiN coated for aluminum
Recommended Cutting Parameters
| Operation | Cutting Speed (m/min) | Feed Rate (mm/rev) | Depth of Cut (mm) |
|---|---|---|---|
| Rough Turning | 300-500 | 0.2-0.4 | 2-5 |
| Finish Turning | 500-800 | 0.05-0.15 | 0.2-0.5 |
| Milling | 400-700 | 0.1-0.3 | 1-5 |
| Drilling | 200-400 | 0.1-0.3 | N/A |
Coolant & Lubrication
- Coolant type: Water-soluble emulsion or compressed air
- Mist cooling: Effective for light cuts and finishing
- Dry machining: Possible for short operations with proper tooling
- Chip evacuation: Use air blast to prevent chip re-cutting
Heat Treatment
- Solution heat treat: 515-540°C, quench in water
- Artificial aging (T6): 160-180°C for 8-12 hours
- Natural aging (T4): Room temperature for 4-5 days
- Annealing: 345-415°C, slow cool for improved formability
Surface Finish Options
- As-machined: Ra 1.6-3.2 μm
- Fine machining: Ra 0.8-1.6 μm
- Anodizing (Type II): Decorative, various colors
- Anodizing (Type III – Hardcoat): Wear resistant, 25-100 μm
- Powder coating: Durable decorative finish
- Chemical film (Alodine): Corrosion resistant conversion coating
- Bead blasting: Uniform matte texture
