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The 7475 alloy is the highest purity alloy in the 7X75 family. As a result, it is used where fracture toughness is critical and has become very popular in ordnance applications, especially shell cases. It has the same basic characteristics as the parent 7075 alloy, with the addition of improved fracture toughness and the potential for a slight decrease in strength.
| Other | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Weight % | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Each | Total | Aluminum |
| minimum | — | — | 1.20 | — | 1.90 | 0.18 | 5.20 | — | — | — | Remainder |
| maximum | 0.10 | 0.12 | 1.90 | 0.06 | 2.60 | 0.25 | 6.20 | — | 0.05 | 0.15 | |
| Characteristics | English | Metric | |
|---|---|---|---|
| Nominal density
(68°F/20°C) |
0.101 lbs/in3 | 2.80 Mg/m3 | |
| Melting range | 890°F-1175°F | 477°C-635°C | |
| Coefficient of thermal expansion | Linear
68°F – 212°F 20°C – 100°C |
12.9 micro in/in- °F | 23.2 micro m/m- °K |
| Thermal conductivity
(68°F/20°C) |
T61, T651 | 80 BTU/ft- hr – °F | 138 W/m – °K |
| T76, T761 | 85 BTU/ft- hr – °F | 155 W/m – °K | |
| T7351 | 94.2 BTU/ft- hr – °F | 163 W/m – °K | |
| Electrical conductivity
(68°F/20°C) |
Equal Volume | T61, T651 | 35% IACS |
| T76, T761 | 40% IACS | ||
| T7351 | 42% IACS | ||
| Equal Weight | T61, T651 | 116% IACS | |
| T76, T761 | 132% IACS | ||
| T7351 | 139% IACS |
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