2618 Aluminum Alloy
| Specification | Form |
|---|---|
| AMS 4132 | Die and hand forgings |
| AMS-QQ-A-367 | Forgings |
| AMS-A-22771 | Die forging |
The temper index for 2618 is as follows:
| Section | Temper |
|---|---|
| 3.2.13.1 | T61 |
3.2.13.1 T61 Temper — Figures 3.2.13.1.1(a) through 3.2.13.1.5 present effect-of-temperature curves for various mechanical properties. Figure 3.2.13.1.6(a) presents tensile and compressive stress-strain and tangent-modulus curves at room temperature. Figure 3.2.13.1.6(b) is a full-range, tensile stress-strain curve at room temperature.
Figure description:
Coefficient of Thermal Expansion vs. Temperature
Annotations
- α - Between 70 °F and indicated temperature (text_label - position: x = 100 to 700, y = 15.5)
| Temperature, °F | α, 10⁻⁶ in./in./°F |
|---|---|
| 200 | 11.55 |
| 250 | 11.88 |
| 300 | 12.20 |
| 350 | 12.45 |
| 400 | 12.70 |
| 450 | 12.92 |
| 500 | 13.15 |
| 550 | 13.35 |
| 600 | 13.55 |
| 650 | 13.72 |
| 700 | 13.85 |
| 750 | 13.96 |
| 780 | 14.00 |
Notes: The graph displays the coefficient of thermal expansion (α as a function of temperature. The values for α are given in units of 10⁻⁶ in./in./°F. The x-axis represents temperature in degrees Fahrenheit (°F. The data points are estimated from the provided grid where minor grid lines for temperature are at 10°F intervals and for α are at 0.1 units intervals.))
Figure 3.2.13.0. Effect of temperature on the thermal expansion of 2618 aluminum alloy.
MIL-HDBK-5J
3.2.13.0 (b). Design Mechanical and Physical Properties of 2618 Aluminum Alloy Die Forging
| Specification | AMS-A-22771 and AMS-QQ-A-367 |
|---|---|
| Form | Die forging |
| Temper | T61 |
| Thickness, in. | ≤ 4.000a |
| Basis | S |
| Mechanical Properties: | |
| Ftu, ksi: | |
| L | 58 |
| Tb | 55 |
| Fty, ksi: | |
| L | 45 |
| Tb | 42 |
| Fcy, ksi: | |
| L | |
| Tb | |
| Fsu, ksi: | |
| Fbru, ksi: | |
| (e/D = 1.5) | |
| (e/D = 2.0) | |
| Fbry, ksi: | |
| (e/D = 1.5) | |
| (e/D = 2.0) | |
| e, percent: | |
| L | 4 |
| Tb | 4 |
| E, 103 ksi | 10.7 |
| Ec, 103 ksi | 10.9 |
| G, 103 ksi | 4.1 |
| μ | 0.33 |
| Physical Properties: | |
| ω, lb/in.3 | 0.100 |
| C, Btu/(lb)(°F) | 0.23 (at 212°F) |
| K, Btu/[(hr)(ft3)(°F)/ft] | 90 (at 77°F) |
| α, 10-6 in./in./°F | See Figure 3.2.13.0 |
- a Thickness at the time of heat treatment. When die forgings are machined before heat treatment, the mechanical properties are applicable provided the as-forged thickness is not greater than twice the thickness at the time of heat treatment.
- b T indicates any grain direction not within ±15° of being parallel to the forging flow lines.
MIL-HDBK-5J
31 January 2003
3.2.13.0 (c). Design Mechanical and Physical Properties of 2618 Aluminum Alloy Hand Forging
| Specification | AMS 4132, AMS-A-22771, and AMS-QQ-A-367 | ||
|---|---|---|---|
| Form | Hand forging | ||
| Temper | T61 | ||
| Cross-Sectional Area, in.2 | <144 | ||
| Thickness,a in | < 2.000 | 2.000-3.000 | 3.001-4.000 |
| Basis | S | S | S |
| Mechanical Properties: | |||
| Fu, ksi: | |||
| L | 58 | 57 | 56 |
| LT | 55 | 55 | 53 |
| ST | 52 | 51 | |
| Fry, ksi: | |||
| L | 47 | 46 | 45 |
| LT | 42 | 42 | 40 |
| ST | 42 | 39 | |
| Fcy, ksi: | |||
| L | 44 | ||
| LT | 42 | ||
| ST | 40 | ||
| Fsu, ksi | 33 | ||
| Fbru, ksi: | |||
| (e/D=1.5) | |||
| (e/D=2.0) | 106 | ||
| Fbry, ksi: | |||
| (e/D = 1.5) | |||
| (e/D = 2.0) | 71 | ||
| e, percent: | |||
| L | 7 | 7 | 7 |
| LT | 5 | 5 | 5 |
| ST | 4 | 4 | |
| E, 103 ksi | 10.7 | ||
| Ec, 103 ksi | 10.9 | ||
| G, 103 ksi | 4.1 | ||
| μ | 0.33 | ||
| Physical Properties: | |||
| ω, lb/in.3 | 0.100 | ||
| C, Btu/(lb)(°F) | 0.23 (at 212°F) | ||
| K, Btu/[(hr)(ft²)(°F)/ft] | 90 (at 77°F) | ||
| α, 10-6 in./in./°F | See Figure 3.2.13.0 | ||
a When hand forgings are machined before heat treatment, the section thickness at time of heat treatment will determine the minimum mechanical properties as long as the original (as-forged) thickness does not exceed the maximum thickness for the alloy as shown in the table.