Aluminum Alloy 2117-T4 vs Aluminum Alloy 2218-T72
Property comparison of Aluminum Alloy 2117-T4 and Aluminum Alloy 2218-T72, both aluminum alloy.
| Property | Aluminum Alloy 2117-T4 | Aluminum Alloy 2218-T72 | Difference |
|---|---|---|---|
| Yield strength | 165 MPa | 255 MPa | +55% |
| Tensile strength | 296 MPa | 331 MPa | +12% |
| Elongation | 27 % | 11 % | -59% |
| Elastic modulus | 73,000 MPa | 73,000 MPa | 0% |
| Shear modulus | 26,000 MPa | 26,000 MPa | 0% |
| Poisson ratio | 0.33 | 0.33 | 0% |
| Density | 2,700 kg/m³ | 2,700 kg/m³ | 0% |
| Brinell hardness | 70 HB | 95 HB | +36% |
| Thermal conductivity | 151 W/m·K | 151 W/m·K | 0% |
| Specific heat | 875 J/kg·K | 864 J/kg·K | -1% |
| Coefficient of thermal expansion | 0.000023 1/K | 0.000023 1/K | 0% |
| Melting point | 510 °C | 510 °C | 0% |
Difference is Aluminum Alloy 2218-T72 relative to Aluminum Alloy 2117-T4. Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- standard
- ANSI
- heat treatment
- Wrought
- standard
- ANSI
- heat treatment
- Wrought
About 2xxx aluminum alloys
2xxx aluminum alloys are alloyed with copper. They reach the highest strengths in the wrought aluminum family but corrode faster than 5xxx or 6xxx and are difficult to weld. 2024 is the aerospace standard for skin and structure; 2014 is used for forgings.
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