7050 at a glance
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Designation
| Item | Value |
|---|---|
| Designation | 7050 |
| Class | Aluminum |
| Type | wrought aluminum alloy |
Composition
| Element | Limit |
|---|---|
| Si | 0.12 |
| Fe | 0.15 |
| Cu | 2.0–2.6 |
| Mn | 0.10 |
| Mg | 1.9–2.6 |
| Cr | 0.04 |
| Zn | 5.7–6.7 |
| Ti | 0.06 |
| Zr | 0.08–0.15 |
| Al | Remainder |
A single number is a maximum. Other elements: 0.05 each, 0.15 total, except where the Teal Sheets say otherwise. Source: Aluminum Association Teal Sheets (Aug 2018).
Specifications and forms
| Specification | Form |
|---|---|
| AMS 4050, AMS 4201 | Bare plate |
| AMS 4107, AMS 4333 | Die forging |
| AMS 4108 | Hand forging |
| AMS 4340, AMS 4341, AMS 4342 | Extruded shape |
| AMS-A-22771 | Forging |
Specifications as listed by MIL-HDBK-5J. Federal QQ-A specifications passed to SAE as AMS-QQ-A. Check the current revision.
Properties
| Property | Value | Source |
|---|---|---|
| Density | 0.102 lb/in³ (2.83 g/cm³) | MIL-HDBK-5J; Teal Sheets |
| E / Ec / G | 10.3 / 10.6 / 3.9 × 10³ ksi | MIL-HDBK-5J Table 3.7.4.0(b1) |
| Arc / spot welding | C / B | MIL-HDBK-5J Table 3.1.3.4(a) |
| Stress corrosion, T74 plate | L: A · LT: A · ST: B | MIL-HDBK-5J Table 3.1.2.3.1(a) |
| Stress corrosion, T76 plate | L: A · LT: A · ST: C | MIL-HDBK-5J Table 3.1.2.3.1(a) |
| Rivet shear, driven 7050-T731 | 43 ksi | MIL-HDBK-5J Table 8.1.2(b) |
Sheet is not listed: MIL-HDBK-5J gives plate, forgings and extrusions.
Design allowables, 7050-T7451 plate
| Property, ksi | 0.250–1.500 A | 0.250–1.500 B | 3.001–4.000 A | 3.001–4.000 B | 7.001–8.000 A | 7.001–8.000 B |
|---|---|---|---|---|---|---|
| Ftu, L | 74 (S) | 76 | 72 | 74 | 68 | 71 |
| Ftu, LT | 74 | 76 | 72 | 75 | 68 | 71 |
| Fty, L | 64 (S) | 67 | 62 (S) | 65 | 58 (S) | 63 |
| Fty, LT | 64 | 66 | 62 | 65 | 58 | 61 |
| Fcy, L | 63 | 64 | 60 | 63 | 55 | 57 |
| Fcy, LT | 66 | 68 | 65 | 68 | 59 | 62 |
| Fsu | 42 | 43 | 43 | 45 | 44 | 46 |
| Fbru, e/D = 1.5 | 107 | 110 | 107 | 111 | 103 | 108 |
| Fbru, e/D = 2.0 | 140 | 144 | 140 | 144 | 132 | 138 |
| Fbry, e/D = 1.5 | 86 | 89 | 90 | 94 | 83 | 87 |
| Fbry, e/D = 2.0 | 101 | 104 | 104 | 109 | 98 | 102 |
Thickness in inches, AMS 4050, MIL-HDBK-5J Table 3.7.4.0(b1), p. 3-324. (S) marks a value printed as S basis. S, A and B are the MIL-HDBK-5J statistical bases. L is the longitudinal grain direction, LT the long transverse. Bearing values are dry-pin values.
Notes from the guide
- Not a source of design allowables. Values are for reference. MMPDS and the SRM govern a repair.
- Not a substitution approval. A different alloy or temper needs approved data.
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Sources
- FAA-H-8083-31B, AMT Handbook — Airframe, Volume 1, Chapter 4 — p. 4-31.
- MIL-HDBK-5J (31 Jan 2003), Chapter 3 — Section 3.7.4.0; Tables 3.1.2.3.1(a), 3.1.3.4(a), 3.7.4.0(a), (b1), 8.1.2(b). Cancelled and superseded by MMPDS: check current MMPDS before design use.
- Aluminum Association, International Alloy Designations (Teal Sheets), rev. Aug 2018 — chemical composition limits and nominal densities.
- MMPDS (formerly MIL-HDBK-5) — the current home of design allowables. A repair substantiation cites MMPDS or the SRM, not a website.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.