2618 T61 Aluminum
2618 T61 Aluminum Alloy is a high-strength aluminum-copper alloy, particularly suitable for applications that work in high temperature and high pressure environments, with widespread use in aerospace and high-performance racing fields. Its unique composition and heat treatment process give it excellent mechanical properties, high-temperature resistance, and fatigue resistance.
2618 aluminum alloy is based on the aluminum-copper alloy system, containing a higher proportion of copper (about 3%) along with small amounts of magnesium, silicon, iron, and other elements. The combination of these components provides excellent high-temperature performance, strength, and fatigue resistance. The T61 heat-treated condition refers to the alloy being solution heat treated and then aged to achieve optimal hardness and strength. This condition enhances the alloy's performance in extreme working environments, especially for applications requiring high-temperature and fatigue resistance.
2618 T61 Aluminum Properties and Performance
- Hardness and Workability: 2618 T61 aluminum alloy has moderate hardness after heat treatment, providing good machinability while maintaining high strength in high-temperature environments. It has good workability, enabling precision machining, cutting, and casting processes.
- Corrosion Resistance: Due to its higher copper content, 2618 T61 aluminum alloy has relatively low corrosion resistance, especially in moist and chlorinated environments. Therefore, despite its suitability for high-temperature environments, additional corrosion protection or coatings may be required for certain applications.
- High-Temperature Performance: One of the major advantages of 2618 T61 aluminum alloy is its high-temperature resistance. The alloy can withstand working environments of up to 300°C and beyond, making it particularly suitable for use in aerospace engines, racing engines, and other high-temperature regions.
- Fatigue Resistance: 2618 T61 aluminum alloy exhibits excellent fatigue resistance, making it especially suitable for applications subjected to cyclic loading over extended periods. In high-temperature and high-pressure environments, it effectively resists material fatigue, ensuring stable long-term performance.
2618 T61 Aluminum Applications
- Aerospace: 2618 T61 aluminum alloy is primarily used in aerospace for engine components such as turbine blades, turbine housings, and nozzles. These parts need to operate under extreme temperatures and pressures, and the high-temperature tolerance and fatigue resistance of 2618 aluminum alloy make it an ideal material.
- High-Performance Racing: In the racing engine field, 2618 T61 aluminum alloy is widely used to manufacture high-performance engine components, especially pistons and turbochargers. Its excellent high-temperature and fatigue resistance allow it to operate stably in high-speed, high-temperature environments, ensuring the performance and durability of race cars.
- Industrial Applications: 2618 T61 aluminum alloy is also widely used in industrial fields, particularly in equipment and components that require high-temperature resistance, such as high-temperature pipelines and structural parts for aerospace vehicles. Due to its high-temperature resistance and good machinability, 2618 aluminum alloy meets the demands of harsh conditions such as high temperatures and heavy loads.
2618 T61 Aluminum High-Temperature Endurance
The high-temperature endurance of 2618 T61 aluminum alloy is exceptional, as it can operate stably in long-term high-temperature environments. Even at temperatures above 300°C, 2618 aluminum alloy can maintain high strength, making it suitable for use in aerospace engines, racing engines, and other high-performance fields. This characteristic makes it particularly ideal for engineering projects requiring high-temperature resistance and high strength.
With its high strength, excellent fatigue resistance, and good high-temperature performance, 2618 T61 aluminum alloy has become an indispensable material in aerospace and high-performance racing fields. Although its corrosion resistance is relatively low, the comprehensive performance of 2618 T61 aluminum alloy is outstanding in high-temperature and high-pressure environments, making it suitable for critical components under extreme working conditions. Its excellent machinability and high-temperature capability have secured its important position in precision manufacturing and high-end applications.
2618 T61 Aluminum Material Property Data Sheet
| 2618 T61 Aluminum Physical Properties | Metric | English | Comments |
| Density | 2.76 g/cc | 0.0997 lb/in³ | AA; Typical |
| 2618 T61 Aluminum Mechanical Properties | Metric | English | Comments |
| Hardness, Brinel | 115 | 115 | AA; Typical; 500 g load; 10 mm ball |
| Hardness, Knoop | 144 | 144 | Converted from Brinell Hardness Value |
| Hardness, Rockwell A | 45.5 | 45.5 | Converted from Brinell Hardness Value |
| Hardness, Rockwell B | 72 | 72 | Converted from Brinell Hardness Value |
| Hardness, Vickers | 130 | 130 | Converted from Brinell Hardness Value |
| Tensile Strength, Ultimate | 441 MPa | 64000 psi | AA; Typical |
| 34.0 MPa @Temperature 371 °C | 4930 psi @Temperature 700 °F | ||
| 52.0 MPa @Temperature 316 °C | 7540 psi @Temperature 601 °F | ||
| 90.0 MPa @Temperature 260 °C | 13100 psi @Temperature 500 °F | ||
| 221 MPa @Temperature 204 °C | 32100 psi @Temperature 399 °F | ||
| 345 MPa @Temperature 149 °C | 50000 psi @Temperature 300 °F | ||
| 427 MPa @Temperature 100 °C | 61900 psi @Temperature 212 °F | ||
| 441 MPa @Temperature -28.0 °C | 64000 psi @Temperature -18.4 °F | ||
| 441 MPa @Temperature 24.0 °C | 64000 psi @Temperature 75.2 °F | ||
| 462 MPa @Temperature -80.0 °C | 67000 psi @Temperature -112 °F | ||
| 538 MPa @Temperature -196 °C | 78000 psi @Temperature -321 °F | ||
| 350 MPa @Thickness 76.23 - 102 mm | 50800 psi @Thickness 3.001 - 4.00 in | Hand forgings; Short transverse | |
| 360 MPa @Thickness <=50.8 mm | 52200 psi @Thickness <=2.00 in | Hand forgings; Short transverse | |
| 360 MPa @Thickness 50.83 - 76.2 mm | 52200 psi @Thickness 2.001 - 3.00 in | Hand forgings; Short transverse | |
| 365 MPa @Thickness 76.23 - 102 mm | 52900 psi @Thickness 3.001 - 4.00 in | Hand forgings; Long transverse | |
| 380 MPa @Thickness <=102 mm | 55100 psi @Thickness <=4.00 in | Die forgings; Axis not parallel to grain flow | |
| 380 MPa @Thickness <=50.8 mm | 55100 psi @Thickness <=2.00 in | Hand forgings; Long transverse | |
| 380 MPa @Thickness 50.83 - 76.2 mm | 55100 psi @Thickness 2.001 - 3.00 in | Hand forgings; Long transverse | |
| 380 MPa @Thickness <=63.5 mm | 55100 psi @Thickness <=2.50 in | Rolled rings; Tangential | |
| 380 MPa @Thickness <=63.5 mm | 55100 psi @Thickness <=2.50 in | Rolled rings; Axial | |
| 385 MPa @Thickness 76.23 - 102 mm | 55800 psi @Thickness 3.001 - 4.00 in | Hand forgings; Longitudinal | |
| 395 MPa @Thickness 50.83 - 76.2 mm | 57300 psi @Thickness 2.001 - 3.00 in | Hand forgings; Longitudinal | |
| 400 MPa @Thickness <=102 mm | 58000 psi @Thickness <=4.00 in | Die forgings; Axis parallel to grain flow | |
| 400 MPa @Thickness <=50.8 mm | 58000 psi @Thickness <=2.00 in | Hand forgings; Longitudinal | |
| 2618 T61 Aluminum Tensile Strength, Yield | 372 MPa | 54000 psi | AA; Typical |
| 270 MPa @Thickness 76.23 - 102 mm | 39200 psi @Thickness 3.001 - 4.00 in | Hand forgings; Short transverse | |
| 275 MPa @Thickness 76.23 - 102 mm | 39900 psi @Thickness 3.001 - 4.00 in | Hand forgings; Long transverse | |
| 285 MPa @Thickness <=63.5 mm | 41300 psi @Thickness <=2.50 in | Rolled rings; Tangential | |
| 285 MPa @Thickness <=63.5 mm | 41300 psi @Thickness <=2.50 in | Rolled rings; Axial | |
| 290 MPa @Thickness <=102 mm | 42100 psi @Thickness <=4.00 in | Die forgings; Axis not parallel to grain flow | |
| 290 MPa @Thickness <=50.8 mm | 42100 psi @Thickness <=2.00 in | Hand forgings; Long transverse | |
| 290 MPa @Thickness <=50.8 mm | 42100 psi @Thickness <=2.00 in | Hand forgings; Short transverse | |
| 290 MPa @Thickness 50.83 - 76.2 mm | 42100 psi @Thickness 2.001 - 3.00 in | Hand forgings; Long transverse | |
| 290 MPa @Thickness 50.83 - 76.2 mm | 42100 psi @Thickness 2.001 - 3.00 in | Hand forgings; Short transverse | |
| 310 MPa @Thickness <=102 mm | 45000 psi @Thickness <=4.00 in | Die forgings; Axis parallel to grain flow | |
| 310 MPa @Thickness 76.23 - 102 mm | 45000 psi @Thickness 3.001 - 4.00 in | Hand forgings; Longitudinal | |
| 315 MPa @Thickness 50.83 - 76.2 mm | 45700 psi @Thickness 2.001 - 3.00 in | Hand forgings; Longitudinal | |
| 325 MPa @Thickness <=50.8 mm | 47100 psi @Thickness <=2.00 in | Hand forgings; Longitudinal | |
| 24.0 MPa @Strain 0.2 %, Temperature 371 °C | 3480 psi @Strain 0.2 %, Temperature 700 °F | ||
| 31.0 MPa @Strain 0.2 %, Temperature 316 °C | 4500 psi @Strain 0.2 %, Temperature 601 °F | ||
| 62.0 MPa @Strain 0.2 %, Temperature 260 °C | 8990 psi @Strain 0.2 %, Temperature 500 °F | ||
| 179 MPa @Strain 0.2 %, Temperature 204 °C | 26000 psi @Strain 0.2 %, Temperature 399 °F | ||
| 303 MPa @Strain 0.2 %, Temperature 149 °C | 43900 psi @Strain 0.2 %, Temperature 300 °F | ||
| 372 MPa @Strain 0.2 %, Temperature -28.0 °C | 54000 psi @Strain 0.2 %, Temperature -18.4 °F | ||
| 372 MPa @Strain 0.2 %, Temperature 24.0 °C | 54000 psi @Strain 0.2 %, Temperature 75.2 °F | ||
| 372 MPa @Strain 0.2 %, Temperature 100 °C | 54000 psi @Strain 0.2 %, Temperature 212 °F | ||
| 379 MPa @Strain 0.2 %, Temperature -80.0 °C | 55000 psi @Strain 0.2 %, Temperature -112 °F | ||
| 421 MPa @Strain 0.2 %, Temperature -196 °C | 61100 psi @Strain 0.2 %, Temperature -321 °F | ||
| Elongation at Break | 10 % @Temperature -28.0 °C | 10 % @Temperature -18.4 °F | |
| 10 % @Temperature 24.0 °C | 10 % @Temperature 75.2 °F | ||
| 10 % @Temperature 100 °C | 10 % @Temperature 212 °F | ||
| 11 % @Temperature -80.0 °C | 11 % @Temperature -112 °F | ||
| 12 % @Temperature -196 °C | 12 % @Temperature -321 °F | ||
| 14 % @Temperature 149 °C | 14 % @Temperature 300 °F | ||
| 24 % @Temperature 204 °C | 24 % @Temperature 399 °F | ||
| 50 % @Temperature 260 °C | 50 % @Temperature 500 °F | ||
| 80 % @Temperature 316 °C | 80 % @Temperature 601 °F | ||
| 120 % @Temperature 371 °C | 120 % @Temperature 700 °F | ||
| 4.0 % @Thickness <=102 mm | 4.0 % @Thickness <=4.00 in | Die forgings; Axis parallel to grain flow | |
| 4.0 % @Thickness <=102 mm | 4.0 % @Thickness <=4.00 in | Die forgings; Axis not parallel to grain flow | |
| 4.0 % @Thickness <=50.8 mm | 4.0 % @Thickness <=2.00 in | Hand forgings; Short transverse | |
| 4.0 % @Thickness 50.83 - 76.2 mm | 4.0 % @Thickness 2.001 - 3.00 in | Hand forgings; Short transverse | |
| 4.0 % @Thickness 76.23 - 102 mm | 4.0 % @Thickness 3.001 - 4.00 in | Hand forgings; Short transverse | |
| 5.0 % @Thickness <=50.8 mm | 5.0 % @Thickness <=2.00 in | Hand forgings; Long transverse | |
| 5.0 % @Thickness 50.83 - 76.2 mm | 5.0 % @Thickness 2.001 - 3.00 in | Hand forgings; Long transverse | |
| 5.0 % @Thickness 76.23 - 102 mm | 5.0 % @Thickness 3.001 - 4.00 in | Hand forgings; Long transverse | |
| 5.0 % @Thickness <=63.5 mm | 5.0 % @Thickness <=2.50 in | Rolled rings; Axial | |
| 6.0 % @Thickness <=63.5 mm | 6.0 % @Thickness <=2.50 in | Rolled rings; Tangential | |
| 7.0 % @Thickness <=50.8 mm | 7.0 % @Thickness <=2.00 in | Hand forgings; Longitudinal | |
| 7.0 % @Thickness 50.83 - 76.2 mm | 7.0 % @Thickness 2.001 - 3.00 in | Hand forgings; Longitudinal | |
| 7.0 % @Thickness 76.23 - 102 mm | 7.0 % @Thickness 3.001 - 4.00 in | Hand forgings; Longitudinal | |
| 10 % @Diameter 12.7 mm | 10 % @Diameter 0.500 in | AA; Typical | |
| Modulus of Elasticity | 74.5 GPa | 10800 ksi | AA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus. |
| Compressive Strength | 370 MPa | 53700 psi | |
| Poissons Ratio | 0.33 | 0.33 | |
| Fatigue Strength | 124 MPa @# of Cycles 5.00e+8 | 18000 psi @# of Cycles 5.00e+8 | completely reversed stress; RR Moore machine/specimen |
| Shear Modulus | 27.0 GPa | 3920 ksi | Calculated |
| Shear Strength | 262 MPa | 38000 psi | AA; Typical |
| Electrical Properties | Metric | English | Comments |
| Electrical Resistivity | 0.00000470 ohm-cm | 0.00000470 ohm-cm | |
| 2618 T61 Aluminum Thermal Properties | Metric | English | Comments |
| CTE, linear | 20.6 µm/m-°C @Temperature -50.0 - 20.0 °C | 11.4 µin/in-°F @Temperature -58.0 - 68.0 °F | |
| 22.3 µm/m-°C @Temperature 20.0 - 100 °C | 12.4 µin/in-°F @Temperature 68.0 - 212 °F | AA; Typical; average over range | |
| 23.2 µm/m-°C @Temperature 20.0 - 200 °C | 12.9 µin/in-°F @Temperature 68.0 - 392 °F | ||
| 24.0 µm/m-°C @Temperature 20.0 - 300 °C | 13.3 µin/in-°F @Temperature 68.0 - 572 °F | average | |
| 24.1 µm/m-°C @Temperature 20.0 - 300 °C | 13.4 µin/in-°F @Temperature 68.0 - 572 °F | ||
| Specific Heat Capacity | 0.875 J/g-°C | 0.209 BTU/lb-°F | |
| Thermal Conductivity | 146 W/m-K | 1010 BTU-in/hr-ft²-°F | |
| Melting Point | 549 - 638 °C | 1020 - 1180 °F | AA; Typical range based on typical composition for wrought products >= 1/4 in. thickness |
| Solidus | 549 °C | 1020 °F | AA; Typical |
| Liquidus | 638 °C | 1180 °F | AA; Typical |
| Processing Properties | Metric | English | Comments |
| Solution Temperature | 529 °C | 985 °F | |
| Aging Temperature | 199 °C | 390 °F | for 20 hr at temperature |