6061 t6 alumini vs 7075 alumini
6061 t6 alumini vs 7075
Aliatges d'alumini 6061-T6 i 7075 s'utilitzen àmpliament en aplicacions d'enginyeria, però tenen propietats diferents i s'adapten a diferents finalitats. A continuació es mostra una comparació detallada d'aquests dos aliatges pel que fa a les seves propietats mecàniques, propietats físiques, i usos típics:
Comparació entre 6061-T6 i 7075 Alumini
| Propietat | 6061-T6 Alumini | 7075 Alumini |
|---|
| Composition | 0.8-1.2% Mg, 0.4-0.8% I, 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 |
| Resistència a la tracció | 310 MPa (45 ksi) | 572 MPa (83 ksi) |
| Límit de rendiment | 275 MPa (40 ksi) | 503 MPa (73 ksi) |
| Elongació a la ruptura | 12% | 11% |
| Duresa (Brinell) | 95 HB | 150 HB |
| Mòdul d'elasticitat | 68.9 GPa (10,000 ksi) | 71.7 GPa (10,400 ksi) |
| Densitat | 2.70 g/cm³ | 2.81 g/cm³ |
| Força a la fatiga | 96 MPa (14 ksi) | 159 MPa (23 ksi) |
| Conductivitat tèrmica | 167 W/m·K | 130 W/m·K |
| Resistència a la corrosió | Excel·lent | Fair to Poor (without protective coating) |
| Soldabilitat | Excel·lent | Pobre |
| Mecanització | Bé | Fair to Good |
| Tractament tèrmic | Heat treatable to T6 condition | Heat treatable to T6 or T73 condition |
Key Differences in Properties
- Strength:
- 7075 Alumini is much stronger, with a tensile strength of 572 MPa compared to 310 MPa for 6061-T6. This makes 7075 aluminum ideal for high-stress structural applications.
- Resistència a la corrosió:
- 6061-T6 Alumini té una excel·lent resistència a la corrosió, especially against atmospheric and marine conditions, while 7075 Alumini has fair to poor corrosion resistance and often requires a protective coating or anodizing for use in corrosive environments.
- Soldabilitat:
- 6061-T6 Alumini is highly weldable, making it suitable for structures requiring frequent welding. 7075 Alumini is difficult to weld and can suffer from cracking and brittleness after welding.
- Mecanització:
- 6061-T6 Alumini is known for its good machinability, which is better than that of 7075 Alumini, although 7075 still offers acceptable machinability for most applications.
- Densitat:
- 7075 Alumini is slightly denser (2.81 g/cm³) than 6061-T6 Alumini (2.70 g/cm³), which can affect weight-sensitive applications.
- Conductivitat tèrmica:
- 6061-T6 Alumini has better thermal conductivity (167 W/m·K) compared to 7075 Alumini (130 W/m·K), making it preferable for heat-exchange applications.
Comparison of Uses
| Application Area | 6061-T6 Alumini | 7075 Alumini |
|---|
| Aeroespacial | Aircraft fittings, dipòsits de combustible, and fuselage structures | High-stress structural parts like aircraft wings, fuselage frames, and landing gear |
| Automotive | Chassis, wheel spacers, and engine components | Racing components like suspension parts, gears, and shafts |
| Marine | Boat hulls, masts, and marine fittings | Not typically used due to poor corrosion resistance |
| General Construction | Structural components, piping, i marcs | Not common; only when high strength is needed |
| Sports Equipment | Marcs de bicicleta, camping equipment, and scuba tanks | High-performance bicycle components, climbing equipment |
| Electronics | Heat sinks and electrical fittings | Not typically used; 6061 is preferred for thermal applications |
| Consumer Goods | Ladders, mobles, and household items | Premium products where high strength is desired, such as rugged outdoor gear |
Summary
- 6061-T6 Alumini is more versatile, easier to work with, and has excellent corrosion resistance, making it suitable for a wide range of applications, including marine, automoció, construcció, and electronics.
- 7075 Alumini 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.
