2025-07-16
#### Strength Showdown: Who Holds Up Better?
7075-T6 aluminum alloy is the undisputed king of strength, with a tensile strength of 500-570 MPa, meaning it can bear 50-57 kilograms per square millimeter. This is mainly due to its high zinc (5.1-6.1%) and magnesium (2.1-2.9%) content, which form MgZn₂ strengthening phases after T6 heat treatment.
In comparison, 2024-T3 aluminum alloy has a tensile strength of 379-469 MPa. While slightly lower, its Al₂CuMg strengthening phases provide better fracture toughness, making it superior under repeated loads.
#### Hardness Battle: Who Wears Better?
7075 has a Brinell hardness of 150 HB, 25% higher than 2024's 120 HB. This difference stems from 7075's finer and denser precipitation strengthening phases, making it the top choice for applications requiring high wear resistance.
#### Corrosion Resistance: Who Lasts Longer?
Surprisingly, the slightly weaker 2024 outperforms in corrosion resistance. The copper in 2024 forms a more stable oxide film, performing better in humid environments. Meanwhile, 7075 requires additional surface treatments (like anodizing) to compensate for this drawback.
#### Application Guide:
- Choose 7075 for: Aircraft landing gear, high-performance bicycle components, mountaineering equipment
- Choose 2024 for: Aircraft skins, marine components, architectural structural parts
**Pro Tip**: If you need ultimate strength and can accommodate additional anti-corrosion treatments, 7075 is ideal. If your project demands better corrosion resistance and fatigue performance, 2024 is the better fit.