6061 T6 aluminium contre 7075 aluminium
6061 T6 aluminium contre 7075
Alliages d'aluminium 6061-T6 et 7075 sont largement utilisés dans les applications d’ingénierie, mais ils ont des propriétés différentes et sont adaptés à des objectifs différents. Vous trouverez ci-dessous une comparaison détaillée de ces deux alliages en termes de propriétés mécaniques., propriétés physiques, et utilisations typiques:
Comparaison entre 6061-T6 et 7075 Aluminium
| Propriété | 6061-T6 Aluminium | 7075 Aluminium |
|---|
| Composition | 0.8-1.2% mg, 0.4-0.8% Et, 0.15-0.4% Cu, 0.04-0.35% Cr | 5.1-6.1% Zn, 2.1-2.9% mg, 1.2-2.0% Cu, 0.18-0.28% Cr |
| Résistance à la traction | 310 MPa (45 ksi) | 572 MPa (83 ksi) |
| Limite d'élasticité | 275 MPa (40 ksi) | 503 MPa (73 ksi) |
| Allongement à la rupture | 12% | 11% |
| Dureté (Brinell) | 95 HB | 150 HB |
| Module d'élasticité | 68.9 GPa (10,000 ksi) | 71.7 GPa (10,400 ksi) |
| Densité | 2.70 g/cm³ | 2.81 g/cm³ |
| Résistance à la fatigue | 96 MPa (14 ksi) | 159 MPa (23 ksi) |
| Conductivité thermique | 167 W/m·K | 130 W/m·K |
| Résistance à la corrosion | Excellent | Fair to Poor (without protective coating) |
| Soudabilité | Excellent | Pauvre |
| Usinabilité | Bien | Fair to Good |
| Traitement thermique | Heat treatable to T6 condition | Heat treatable to T6 or T73 condition |
Key Differences in Properties
- Force:
- 7075 Aluminium is much stronger, with a tensile strength of 572 MPa compared to 310 MPa for 6061-T6. Cela fait 7075 aluminum ideal for high-stress structural applications.
- Résistance à la corrosion:
- 6061-T6 Aluminium a une excellente résistance à la corrosion, especially against atmospheric and marine conditions, tandis que 7075 Aluminium has fair to poor corrosion resistance and often requires a protective coating or anodizing for use in corrosive environments.
- Soudabilité:
- 6061-T6 Aluminium is highly weldable, making it suitable for structures requiring frequent welding. 7075 Aluminium is difficult to weld and can suffer from cracking and brittleness after welding.
- Usinabilité:
- 6061-T6 Aluminium is known for its good machinability, which is better than that of 7075 Aluminium, although 7075 still offers acceptable machinability for most applications.
- Densité:
- 7075 Aluminium is slightly denser (2.81 g/cm³) than 6061-T6 Aluminium (2.70 g/cm³), which can affect weight-sensitive applications.
- Conductivité thermique:
- 6061-T6 Aluminium has better thermal conductivity (167 W/m·K) compared to 7075 Aluminium (130 W/m·K), making it preferable for heat-exchange applications.
Comparison of Uses
| Application Area | 6061-T6 Aluminium | 7075 Aluminium |
|---|
| Aérospatial | Aircraft fittings, réservoir d'essence, and fuselage structures | High-stress structural parts like aircraft wings, fuselage frames, and landing gear |
| Automobile | Chassis, wheel spacers, and engine components | Racing components like suspension parts, gears, and shafts |
| Marin | Boat hulls, mâts, et aménagements marins | Not typically used due to poor corrosion resistance |
| General Construction | Les composants structuraux, tuyauterie, et des cadres | Not common; only when high strength is needed |
| Sports Equipment | Cadres de vélo, camping equipment, and scuba tanks | High-performance bicycle components, climbing equipment |
| Électronique | Heat sinks and electrical fittings | Not typically used; 6061 is preferred for thermal applications |
| Biens de consommation | Ladders, meubles, and household items | Premium products where high strength is desired, such as rugged outdoor gear |
Summary
- 6061-T6 Aluminium is more versatile, easier to work with, et a une excellente résistance à la corrosion, ce qui le rend adapté à un large éventail d'applications, including marine, automobile, construction, et électronique.
- 7075 Aluminium offers superior strength, making it ideal for high-stress applications like aerospace and high-performance sports equipment, but it has poorer weldability and corrosion resistance, limiting its use in certain environments.
