Aluminium, BS-L
L111 Aluminium Alloy Bar & Extrusion T6511
Heat treatable aerospace aluminium alloy with very good corrosion resistance and weldability.
L111 is a medium strength extruded bar with an alloy strength somewhat higher than alloy 6061. It is not suitable for complex sections.
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L111 T6511 Aluminium Related Specifications
| System / Standard | Country / Region | Grade / Designation / Note |
| AA | USA | No single official AA number; L111-T6511 is a BS aerospace code |
| UNS | International | No specific UNS assigned; depends on the alloy defined in the spec |
| EN / DIN | Europe | No unique EN AW mapping; refer to the BS L111 material specification |
| GB (BS Aerospace) | United Kingdom | L111-T6511 – aluminium alloy extruded bars/sections, T6511 temper |
| JIS | Japan | No direct JIS equivalent published |
| AFNOR | France | No direct AFNOR equivalent published |
Properties
Chemical Composition
Alloy L111
BS L111 (1971)
| Chemical Element | % Present |
| Manganese (Mn) | 0.40 - 1.00 |
| Silicon (Si) | 0.70 - 1.30 |
| Magnesium (Mg) | 0.50 - 1.20 |
| Copper (Cu) | 0.00 - 0.10 |
| Iron (Fe) | 0.00 - 0.50 |
| Tin (Sn) | 0.00 - 0.05 |
| Chromium (Cr) | 0.00 - 0.25 |
| Nickel (Ni) | 0.00 - 0.10 |
| Lead (Pb) | 0.00 - 0.05 |
| Titanium (Ti) | 0.00 - 0.20 |
| Zinc (Zn) | 0.00 - 0.20 |
| Aluminium (Al) | Balance |
Mechanical Properties
Alloy L111 - Mechanical Properties T6511 Temper for Various Dimensions
BS L111 (1971)
| Mechanical Property | Value |
| >20mm Proof Strength | 255 Min |
| >20mm Tensile Strength | 295 Min |
| >20mm Elongation | 7% min |
| 20mm - 150mm Proof Stress | 270 min |
| 20mm - 150mm Tensile Strength | 310 Min |
| 20mm - 150mm Elongation | 8% min |
| 150mm - 200mm Proof Stress | 240 Min |
| 150mm - 200mm Tensile Strength | 280 Min |
| 150mm - 200mm Elongation | 5% Min |
General Physical Properties
Alloy L111
BS L111 (1971)
| Physical Property | Value |
| Density | 2710 g/cm³ |
| Melting Point | 650 °C |
| Thermal Expansion | 23.10 x 10-6/K |
| Modulus of Elasticity | 70000 GPa |
| Thermal Conductivity | 167-216 W/m.K |
Applications
- Aerospace components
- High technology applications
Characteristics
- Very good corrosion resistance
- Very good weldability (lowered strength values in the weld zone)
- Good machinability
- Good cold formability in T4 temper after a stabilizing heat treatment.
- Heat treatable medium high strength construction
- Medium high fatigue strength
