Aluminum 7178 is stocked by 2 North American distributors and produced by 11 large mills. Distributors will offer small quantity buys while mills will generally only sell large quantities, with delivery times anywhere from 10 to 50 weeks depending on size and form required
This material is stocked primarily in Flat Rolled Products by 1 distributors but is also available to a lesser extent in Shapes.
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For mill (large volume) production click here
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Specifications
The following specifications cover Aluminum 7178
- ASTM B209
- ASTM B221
- ASTM B241
- ASTM B316
- QQ A-200/13
- QQ A-200/14
- QQ A-250/14
- QQ A-250/21
- QQ A-250/28
- QQ A-430
- SAE J454
- UNS A97178
Property Results
Chemistry Data : [top]
Aluminum
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Balance |
Chromium
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0.18 - 0.35 |
Copper
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1.6 - 2.4 |
Iron
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0.5 max |
Magnesium
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2.4 - 3.1 |
Manganese
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0.3 max |
Remainder Each
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0.05 max |
Remainder Total
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0.15 max |
Silicon
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0.4 max |
Titanium
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0.2 max |
Zinc
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6.3 - 7.3 |
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Principal Design Features
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Alloy 7178 is a high strength alloy with magnesium and copper as the major alloying elements. It is heat treatable and develops improved mechanical properties from precipitation hardening.
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Applications
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Commonly used in the manufacture of aircraft and other structures.
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Machinability
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Machinability of this alloy is good, especially in the annealed condition. Use of oil lubrication during machining is recommended.
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Forming
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The 7178 alloy is difficult to work, or form, in any of the T tempers. Bend radii must be generous, as 4 or 5 times material thickness for sheet product form in T6 condition.
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Welding
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Resistance welding methods should be used for this alloy. Approved methods for the fusion welding of the alloy are not available.
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Heat Treatment
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The alloy is solution heat treated at 875 F (W temper) and water quenched. It may subsequently be given a precipitation hardening treatment - see "Aging"
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Forging
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No data available. Product forms are usually rolled or extruded shapes.
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Hot Working
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No data available.
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Cold Working
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Cold working is considerably more difficult for this alloy than for many of the other aluminum alloys. Bend radii must be generous, for example 4 times thickness for 0.063" thick sheet in the T6 temper.
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Annealing
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Anneal at 775 F for 3 hours, cool (at any rate) to 400 F or less then heat to 450 F and hold there for 4 hours. Air cool. This will remove the solution heat treatment condition and produce O temper. For annealing during cold working a 650 F soak followed by air cooling will suffice.
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Aging
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Precipitation heat treatment (Aging) is done at 250 F for 24 hours to obtain T6 and T651 tempers. Foe the T76 and T7651 temper heat to 250 f for 3 hours, followed by 350 F for 20 hours and air cool.
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Tempering
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Not applicable.
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Hardening
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This alloy precipitation hardens. See "Aging".
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Other Physical Props
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Electrical conductivity 30% of copper.
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Other Mechanical Props
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Shear strength values: O temper, 22 ksi and for T6 temper, 52 ksi
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Physical Data : [top]
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Density (lb / cu. in.)
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0.102
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Specific Gravity
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2.83
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Melting Point (Deg F)
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900
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Modulus of Elasticity Tension
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10.4
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Mechanical Data : [top]
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MSO currently has no data available for this grade.
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Videos :
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MSO currently has no videos available for this grade.
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Disclaimer
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This publication may include technical inaccuracies or typographical errors. Changes may be periodically made to the information herein.
