7049 Aluminum vs. 7049-T73 Aluminum
7049-T73 aluminum alloy is a variant of the 7049 aluminum alloy, with most properties being similar between the two, with the only significant difference in some mechanical properties and toughness.
The mechanical properties and performance of 7049-T73 aluminum are slightly enhanced, but otherwise, it is very similar to 7049 aluminum. The choice between the two typically depends on the specific requirements of the application, but both materials are well-suited for high-strength, lightweight structures in aerospace and other demanding industries.
- Mechanical Properties: Both materials have similar performance, with only slight differences, such as fracture elongation and shear strength.
- Thermal Properties: 7049 aluminum and 7049-T73 aluminum are identical.
- Electrical Properties: There is no difference between the two variants.
The performance exhibited by 7049 T73 aluminum is very close to that of its parent material, with specific characteristics slightly different, but overall, the two materials are very similar.
Comparison of 7049 Aluminum Alloy and 7049-T73 Aluminum Alloy
| Property Category | 7049 Aluminum Alloy | 7049-T73 Aluminum Alloy | Difference Description |
| Mechanical Properties | Similar to 7049-T73 aluminum alloy | Slightly higher shear strength, slightly lower fracture elongation | 7049-T73 has slightly better shear strength, but a slightly lower fracture elongation |
| Thermal Properties | Identical | Identical | No difference between the two |
| Electrical Properties | Identical | Identical | No difference between the two |
| Other Unclassified Properties | Identical | Identical | No difference between the two |
| Strength-to-Weight Ratio | Slightly lower | Slightly higher | 7049-T73 is slightly superior in strength-to-weight ratio and thermal shock resistance |
7049-T73 aluminum alloy is a specific variant of 7049 aluminum alloy, with almost identical properties overall, with the main differences in shear strength, strength-to-weight ratio, and thermal shock resistance.
7049 Aluminum vs. 7049-T73 Aluminum Mechanical Properties
| Property | 7049 Aluminum | 7049-T73 Aluminum |
| Brinell Hardness | 140 | 140 |
| Elastic (Young's, Tensile) Modulus (x 10^6 psi) | 10 | 10 |
| Elongation at Break (%) | 6.2 to 7.0 | 6.2 |
| Fatigue Strength (x 10^3 psi) | 24 | 24 |
| Poisson's Ratio | 0.32 | 0.32 |
| Shear Modulus (x 10^6 psi) | 3.8 | 3.8 |
| Shear Strength (x 10^3 psi) | 43 to 44 | 44 |
| Tensile Strength: Ultimate (UTS) (x 10^3 psi) | 74 to 76 | 76 |
| Tensile Strength: Yield (Proof) (x 10^3 psi) | 61 to 65 | 65 |
7049 Aluminum vs. 7049-T73 Aluminum Thermal Properties
| Property | 7049 Aluminum | 7049-T73 Aluminum |
| Latent Heat of Fusion (J/g) | 370 | 370 |
| Maximum Temperature: Mechanical (°F) | 350 | 350 |
| Melting Completion (Liquidus) (°F) | 1180 | 1180 |
| Melting Onset (Solidus) (°F) | 890 | 890 |
| Specific Heat Capacity (BTU/lb-°F) | 0.2 | 0.2 |
| Thermal Conductivity (BTU/h-ft-°F) | 77 | 77 |
| Thermal Expansion (µm/m-K) | 23 | 23 |
7049 Aluminum vs. 7049-T73 Aluminum Electrical Properties
| Property | 7049 Aluminum | 7049-T73 Aluminum |
| Electrical Conductivity: Equal Volume (% IACS) | 36 | 36 |
| Electrical Conductivity: Equal Weight (Specific) (% IACS) | 110 | 110 |
How to Choose Between 7049 Aluminum Alloy and 7049-T73 Aluminum Alloy
The choice between 7049 aluminum alloy and 7049-T73 aluminum alloy mainly depends on your specific application needs and performance requirements.
- Choose 7049-T73 aluminum alloy: If you need higher shear strength, better strength-to-weight ratio, higher thermal shock resistance, and can accept a slightly higher cost.
- Choose 7049 aluminum alloy: If your application requires higher ductility, or if cost is a major consideration and performance requirements do not require the optimization of the T73 condition.
| Selection Criteria | 7049 Aluminum Alloy | 7049-T73 Aluminum Alloy | Selection Recommendation |
| Strength Requirements of the Application | Suitable for applications requiring higher fracture elongation, with higher elongation | Suitable for applications requiring higher shear strength and thermal shock resistance, with higher shear strength and slightly lower elongation | If higher shear strength or better thermal shock resistance is needed, choose 7049-T73. If the application requires higher fracture elongation, choose 7049. |
| Thermal and Electrical Properties | Identical to T73 state, suitable for general applications | Identical to conventional 7049 aluminum alloy | If thermal and electrical properties are critical factors and extreme conditions are not involved, there is no significant difference between 7049 and 7049-T73. |
| Strength-to-Weight Ratio Requirements | Slightly lower | Slightly higher | If a higher strength-to-weight ratio (such as in aerospace) is required, choose 7049-T73, as it has a slight advantage in this aspect. |
| Cost and Workability | Lower cost, generally cheaper, may offer better workability in some cases | Higher cost, heat-treated, may perform differently in machining | If cost is a key factor or better workability is required, choose 7049; if higher strength and thermal shock resistance are pursued, choose 7049-T73. |
| Other Considerations | No particularly demanding requirements for corrosion resistance, electrical conductivity, or general mechanical properties | No particularly demanding requirements for corrosion resistance, electrical conductivity, or general mechanical properties | If corrosion resistance, electrical conductivity, or general mechanical properties are not critical, the two materials are nearly identical and the choice can be based on cost, availability, and other factors. |
Otherwise Unclassified Properties
| Property | 7049 Aluminum | 7049-T73 Aluminum |
| Base Metal Price (% relative) | 10 | 10 |
| Density (lb/ft³) | 190 | 190 |
| Embodied Carbon (kg CO₂/kg material) | 8.1 | 8.1 |
| Embodied Energy (x 10^3 BTU/lb) | 62 | 62 |
| Embodied Water (gal/lb) | 130 | 130 |
Common Calculations
| Property | 7049 Aluminum | 7049-T73 Aluminum |
| Resilience: Ultimate (Unit Rupture Work) (MJ/m³) | 31 to 34 | 31 |
| Resilience: Unit (Modulus of Resilience) (kJ/m³) | 1270 to 1440 | 1440 |
| Stiffness to Weight: Axial (points) | 13 | 13 |
| Stiffness to Weight: Bending (points) | 45 | 45 |
| Strength to Weight: Axial (points) | 46 to 47 | 47 |
| Strength to Weight: Bending (points) | 46 to 47 | 47 |
| Thermal Diffusivity (mm²/s) | 51 | 51 |
| Thermal Shock Resistance (points) | 22 to 23 | 23 |