6061 alumínio t6 vs. 7075 alumínio
6061 alumínio t6 vs. 7075
Ligas de alumínio 6061-T6 e 7075 são amplamente utilizados em aplicações de engenharia, mas eles têm propriedades diferentes e são adequados para finalidades diferentes. Abaixo está uma comparação detalhada dessas duas ligas em termos de suas propriedades mecânicas, propriedades físicas, e usos típicos:
Comparação entre 6061-T6 e 7075 Alumínio
| Propriedade | 6061-Alumínio T6 | 7075 Alumínio |
|---|
| Composição | 0.8-1.2% Mg, 0.4-0.8% E, 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 |
| Resistência à tracção | 310 MPa (45 ksi) | 572 MPa (83 ksi) |
| Força de rendimento | 275 MPa (40 ksi) | 503 MPa (73 ksi) |
| Alongamento na ruptura | 12% | 11% |
| Dureza (Brinell) | 95 HB | 150 HB |
| Módulos de elasticidade | 68.9 GPa (10,000 ksi) | 71.7 GPa (10,400 ksi) |
| Densidade | 2.70 g/cm³ | 2.81 g/cm³ |
| Fatigue Strength | 96 MPa (14 ksi) | 159 MPa (23 ksi) |
| Condutividade térmica | 167 S/m·K | 130 S/m·K |
| Resistência à corrosão | Excelente | Fair to Poor (without protective coating) |
| Soldabilidade | Excelente | Poor |
| Maquinabilidade | Bom | Fair to Good |
| Tratamento térmico | Heat treatable to T6 condition | Heat treatable to T6 or T73 condition |
Key Differences in Properties
- Força:
- 7075 Alumínio is much stronger, with a tensile strength of 572 MPa compared to 310 MPa for 6061-T6. Isto faz 7075 aluminum ideal for high-stress structural applications.
- Resistência à corrosão:
- 6061-Alumínio T6 has excellent corrosion resistance, especially against atmospheric and marine conditions, enquanto 7075 Alumínio has fair to poor corrosion resistance and often requires a protective coating or anodizing for use in corrosive environments.
- Soldabilidade:
- 6061-Alumínio T6 is highly weldable, making it suitable for structures requiring frequent welding. 7075 Alumínio is difficult to weld and can suffer from cracking and brittleness after welding.
- Maquinabilidade:
- 6061-Alumínio T6 is known for its good machinability, which is better than that of 7075 Alumínio, although 7075 still offers acceptable machinability for most applications.
- Densidade:
- 7075 Alumínio is slightly denser (2.81 g/cm³) than 6061-Alumínio T6 (2.70 g/cm³), which can affect weight-sensitive applications.
- Condutividade térmica:
- 6061-Alumínio T6 has better thermal conductivity (167 S/m·K) compared to 7075 Alumínio (130 S/m·K), making it preferable for heat-exchange applications.
Comparison of Uses
| Application Area | 6061-Alumínio T6 | 7075 Alumínio |
|---|
| Aeroespacial | Aircraft fittings, tanques de combustível, and fuselage structures | High-stress structural parts like aircraft wings, fuselage frames, and landing gear |
| Automotivo | Chassis, wheel spacers, and engine components | Racing components like suspension parts, gears, and shafts |
| Marinho | Boat hulls, mastros, e acessórios marítimos | Not typically used due to poor corrosion resistance |
| General Construction | Componentes estruturais, piping, e molduras | Not common; only when high strength is needed |
| Sports Equipment | Quadros de bicicleta, camping equipment, and scuba tanks | High-performance bicycle components, climbing equipment |
| Eletrônicos | Heat sinks and electrical fittings | Not typically used; 6061 is preferred for thermal applications |
| Bens de consumo | Ladders, mobília, and household items | Premium products where high strength is desired, such as rugged outdoor gear |
Summary
- 6061-Alumínio T6 is more versatile, easier to work with, e tem excelente resistência à corrosão, tornando-o adequado para uma ampla gama de aplicações, including marine, automotivo, construção, e eletrônica.
- 7075 Alumínio 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.
