6061 7075 metal alloy aluminium plate


Aluminium plates fabricated from the 6061 and 7075 alloys are among the most popular and widely used aerospace, automotive, and structural metals today. These aluminum alloy plates provide a remarkable combination of strength, machinability, corrosion resistance, and versatility suitable for a wide range of demanding applications.

Alloy Type6061 Aluminum Plate7075 Aluminum Plate
Series6xxx (Al-Mg-Si alloy)7xxx (Al-Zn-Mg-Cu alloy)
TemperT6 (solution heat-treated and artificially aged)T6 (solution heat-treated and artificially aged)
Common FormsSheet, plate, extrusionsSheet, plate, forgings
TraitsGood strength, excellent corrosion resistance, good machinabilityExcellent strength, slightly inferior corrosion resistance

Chemical Composition

The typical chemical composition (in wt%) of 6061 and 7075 aluminum alloys is listed below. Variations can occur based on source specifications.

Element6061 (wt%)7075 (wt%)
Aluminum (Al)BalanceBalance
Magnesium (Mg)0.8 – 1.22.1 – 2.9
Silicon (Si)0.4 – 0.80.4 – 0.8
Copper (Cu)0.15 – 0.41.2 – 2.0
Zinc (Zn)0.25 max5.1 – 6.1
Chromium (Cr)0.04 – 0.350.18 – 0.28
Iron (Fe)0.7 max0.5 max
Manganese (Mn)0.15 max0.3 max
Titanium (Ti)0.15 max0.2 max

Physical and Mechanical Properties at Room Temperature (T6 Temper)

Property6061-T6 Aluminum Plate7075-T6 Aluminum Plate
Density (g/cm³)2.702.81
Tensile Strength (MPa)290 – 320520 – 560
Yield Strength (MPa)240 – 280480 – 525
Elongation at Break (%)10 – 175 – 11
Modulus of Elasticity (GPa)68.971.7
Hardness (BHN)95 – 107150 – 190
Thermal Conductivity (W/m·K)~167~130
Electrical Resistivity (μΩ·cm)~40~45
Melting Point (°C)582 – 652477 – 635

Features

6061 Aluminium Plate

  • Moderate to High Strength: Offers a balanced tensile strength and toughness for structural applications.
  • Excellent Corrosion Resistance: Exceptional resistance to atmospheric corrosion, ideal for marine and chemical exposure.
  • Good Weldability: Easily weldable using conventional techniques such as TIG and MIG welding.
  • Good Machinability: Machines well with high-quality surface finish.
  • Versatility: Can be anodized for improved surface hardness and appearance.

7075 Aluminium Plate

  • Highest Strength Aluminum Alloy Plate: Comparable strength to many steels, making it suitable for critical load-bearing applications.
  • Good Fatigue Resistance: Maintains strength under cyclic loading.
  • Heat Treatability: Frequently solution heat-treated for optimum mechanical advantage.
  • Moderate Corrosion Resistance: Although less corrosion-resistant than 6061, it performs well with surface treatments like anodizing or cladding.
  • Good Bearing Strength: Applicable where surface loading needs to be withstood, such as gears and bearings.

Typical Applications

Industry6061 Plate Applications7075 Plate Applications
AerospaceLightweight aircraft components, fuselage frames, bracketsStructural aircraft parts, high strength gears, machinery parts
AutomotiveChassis components, engine parts, overturned “hood” panelsHigh-performance automotive components, racing parts
MarineBoat hulls, decks, marine fittingsCargo vessels requiring reinforced components
ConstructionStructural profiles, scaffolding, architectural elementsStructural frames requiring very high load-bearing capabilities
ElectronicsEnclosures, heat sinksElectronic housings requiring stiffness and rigidity
Sports EquipmentBicycle frames, frames for other recreational vehiclesHigh-stress sports components such as racing bicycles, firearms

Processing Recommendations

  • Forming: Both alloys can be formed using cold stamping or bending, though 7075 may require heating due to its strength.
  • Machining: Use carbide tools for 7075 aluminum alloy due to its high strength, while standard tools suffice for 6061.
  • Welding: For critical applications requiring welding, 6061 is preferable; for 7075, welding must be carefully controlled as it weakens after heat exposure.
  • Surface Treatment: Anodizing is recommended for both alloys to improve corrosion resistance and surface hardness.

6061    7075   

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