2618 T61 aluminum alloy, with its excellent high-temperature strength, fatigue resistance, and high tensile strength, is an ideal material for aerospace, racing, and high-performance industrial applications. Although its corrosion resistance is slightly inferior, its performance under high temperature and high-stress conditions is exceptional, making it suitable for applications that require high strength and the ability to withstand pressure and extreme working environments over extended periods.
2618 T61 aluminum alloy is a high-strength aluminum alloy, widely used in aerospace, high-performance automotive applications, and industrial fields, especially in situations that require withstanding high temperatures, high stress, and extreme working conditions. It belongs to the aluminum-copper alloy family and contains a higher amount of copper, magnesium, and small amounts of manganese, silicon, and other alloying elements, which give it excellent strength and fatigue resistance at high temperatures.
High Strength
2618 T61 aluminum alloy has high tensile and yield strength at room temperature, and particularly at high temperatures, it retains good strength and durability. As a result, it is commonly used in applications that operate in high-temperature environments, such as jet engines, racing components, and aerospace structures.
Heat Treatment Response
In the T61 condition, 2618 aluminum alloy undergoes solution heat treatment, which results in very high strength, and through aging hardening, its mechanical properties can be further enhanced. This heat treatment process makes it a high-performance alloy, suitable for applications that require withstanding enormous stress and high temperatures.
Corrosion Resistance
Although the corrosion resistance of 2618 alloy is not as good as that of other aluminum alloys (such as 5083 or 6061), it still performs quite well in high-temperature environments.
Good Machinability
2618 T61 aluminum alloy has good machinability and is suitable for precision machining, cutting, and casting processes. In the heat-treated condition, its hardness is higher, but it still maintains good machinability.
High-Temperature Stability
2618 T61 aluminum alloy has excellent high-temperature performance, capable of withstanding working temperatures up to 300°C or even higher, making it especially suitable for engine components, turbine blades, cylinder blocks, and other parts that require prolonged high-temperature operation.
Fatigue Resistance
Due to the copper content in the alloy, 2618 T61 aluminum alloy has good fatigue resistance and can maintain a long service life under long-term cyclic loads.
Aerospace:
2618 T61 aluminum alloy is primarily used for critical components in aerospace engines, such as turbine blades, turbine casings, nozzles, pressurized cabin components, and more. These parts often need to operate under high-temperature and high-speed airflow conditions, making the high-temperature strength and fatigue resistance of 2618 alloy crucial.
Automotive:
In high-performance racing, 2618 T61 aluminum alloy is widely used in engine components, pistons, turbochargers, and more. Due to its excellent strength and high-temperature performance, it is highly suitable for racing engines and parts that must withstand extreme temperatures and pressures.
Industrial Applications:
2618 aluminum alloy is also used to manufacture structural parts and equipment that need to operate at high temperatures, such as high-temperature pipes, aerospace structural components, and more.
| 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 |
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