The differences in the properties and characteristics of these alloys determine the applications for which each is best suited.
7075
The 7075 alloy does not offer the best formability or weldability. However, it stands out in high-stress applications where exceptional strength is required. Often referred to as an "aircraft-grade" alloy, 7075 is among the strongest aluminum alloys available on the market.
It is widely used in spacecraft, aircraft, missiles, and other defense-related applications. You will also commonly find 7075 used in components exposed to heavy wear, military equipment, and structural parts.
6061
6061 aluminum alloy is more versatile thanks to its excellent workability, corrosion resistance, strength, and joinability. It is used across a broad range of industries in applications such as welded assemblies, electronics, structural components, piping, fasteners, and more. Common uses include:
Furniture
Aircraft fittings and structural parts
Yachts, sailboats, marine hardware, and other shipbuilding components
Trucks, braking systems, bus bodies, hydraulic pistons, and other automotive applications
Mouldings
Awnings
Food and beverage containers
Appliance fittings
6061 aluminum is available in multiple forms, including aluminum plate, bar, and tube.
Density
While pure aluminum shares the same density, adding alloying elements changes the overall density of the final alloy. Density is a key factor when comparing the physical characteristics of metals.
7075 aluminum has a density of 2.81 g/cm³, higher than pure aluminum. It can be strengthened through heat treatment, with 7075-T6 being the most common temper.
6061 aluminum has a density of 2.7 g/cm³, close to that of pure aluminum due to its high aluminum content.
Mechanical Properties
| Property | 6061 Aluminum (Metric/English) | 7075 Aluminum (Metric/English) |
|---|---|---|
| Yield Strength | 276 MPa / 40,000 psi | 503 MPa / 73,000 psi |
| Modulus of Elasticity | 68.9 GPa / 10,000 ksi | 71.7 GPa / 10,400 ksi |
| Thermal Conductivity | 167 W/m·K / 1160 BTU-in/hr-ft²-°F | 130 W/m·K / 900 BTU-in/hr-ft²-°F |
| Melting Point | 1080–1205 °F / 582–652 °C | 890–1175 °F / 477–635 °C |
| Electrical Resistivity | 3.99 × 10⁻⁶ ohm-cm | 5.15 × 10⁻⁶ ohm-cm |
| Hardness (Brinell) | 95 | 150 |
| Machinability | Good | Fair |
Thermal Conductivity
Thermal conductivity measures how efficiently a material transfers heat. Although both 6061 and 7075 are heat-treatable alloys, 7075 is much stronger and has a slightly lower melting temperature.
6061 aluminum, by contrast, has higher thermal conductivity, making it more suitable for applications requiring efficient heat transfer. Among heat-treated options, 6061 plate is considered more versatile, especially because of its corrosion resistance and high toughness.
Closing Remarks
Understanding the differences between these two alloys-despite their shared aluminum base-helps ensure the right choice is made for specific applications. The addition of alloying elements significantly alters their performance, so comparing 6061 and 7075 in detail is essential.
Partnering for Excellence:
GNEE's team of specialists is dedicated to helping you choose the right material for your project. Both alloys are in stock and ready for prompt delivery to your location.
