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Aluminum 7178-T76; 7178-T7651
Categories: Metal; Nonferrous Metal; Aluminum Alloy; 7000 Series Aluminum Alloy

Material Notes: Data points with the AA note have been provided by the Aluminum Association, Inc. and are NOT FOR DESIGN.

Composition Notes: Composition information provided by the Aluminum Association and is not for design.

Key Words: UNS A97178; Aluminium 7178-T76; Aluminium 7178-T7651; AA7178-T76; AA7178-T7651; Al7178-T76
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Physical PropertiesMetricEnglishComments
Density 2.83 g/cc0.102 lb/in³AA; Typical
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 152152500 kg load with 10 mm ball. Calculated value.
Hardness, Knoop 193193Converted from Brinell Hardness Value
Hardness, Rockwell A 53.953.9Converted from Brinell Hardness Value
Hardness, Rockwell B 8888Converted from Brinell Hardness Value
Hardness, Vickers 177177Converted from Brinell Hardness Value
Tensile Strength, Ultimate 572 MPa83000 psiAA; Typical
 45.0 MPa
@Temperature 371 °C
6530 psi
@Temperature 700 °F
 59.0 MPa
@Temperature 316 °C
8560 psi
@Temperature 601 °F
 76.0 MPa
@Temperature 260 °C
11000 psi
@Temperature 500 °F
 105 MPa
@Temperature 204 °C
15200 psi
@Temperature 399 °F
 215 MPa
@Temperature 149 °C
31200 psi
@Temperature 300 °F
 475 MPa
@Temperature 100 °C
68900 psi
@Temperature 212 °F
 570 MPa
@Temperature 24.0 °C
82700 psi
@Temperature 75.2 °F
 605 MPa
@Temperature -28.0 °C
87700 psi
@Temperature -18.4 °F
 625 MPa
@Temperature -80.0 °C
90600 psi
@Temperature -112 °F
 730 MPa
@Temperature -196 °C
106000 psi
@Temperature -321 °F
Tensile Strength, Yield 503 MPa73000 psiAA; Typical
 38.0 MPa
@Strain 0.2 %,
Temperature 271 °C
5510 psi
@Strain 0.2 %,
Temperature 520 °F
 48.0 MPa
@Strain 0.2 %,
Temperature 316 °C
6960 psi
@Strain 0.2 %,
Temperature 601 °F
 62.0 MPa
@Strain 0.2 %,
Temperature 260 °C
8990 psi
@Strain 0.2 %,
Temperature 500 °F
 83.0 MPa
@Strain 0.2 %,
Temperature 204 °C
12000 psi
@Strain 0.2 %,
Temperature 399 °F
 185 MPa
@Strain 0.2 %,
Temperature 149 °C
26800 psi
@Strain 0.2 %,
Temperature 300 °F
 440 MPa
@Strain 0.2 %,
Temperature 100 °C
63800 psi
@Strain 0.2 %,
Temperature 212 °F
 505 MPa
@Strain 0.2 %,
Temperature 24.0 °C
73200 psi
@Strain 0.2 %,
Temperature 75.2 °F
 525 MPa
@Strain 0.2 %,
Temperature -28.0 °C
76100 psi
@Strain 0.2 %,
Temperature -18.4 °F
 540 MPa
@Strain 0.2 %,
Temperature -80.0 °C
78300 psi
@Strain 0.2 %,
Temperature -112 °F
 615 MPa
@Strain 0.2 %,
Temperature -196 °C
89200 psi
@Strain 0.2 %,
Temperature -321 °F
Elongation at Break  10 %
@Temperature -196 °C
10 %
@Temperature -321 °F
 10 %
@Temperature -80.0 °C
10 %
@Temperature -112 °F
 10 %
@Temperature -28.0 °C
10 %
@Temperature -18.4 °F
 11 %
@Temperature 24.0 °C
11 %
@Temperature 75.2 °F
 17 %
@Temperature 100 °C
17 %
@Temperature 212 °F
 40 %
@Temperature 149 °C
40 %
@Temperature 300 °F
 70 %
@Temperature 204 °C
70 %
@Temperature 399 °F
 76 %
@Temperature 260 °C
76 %
@Temperature 500 °F
 80 %
@Temperature 316 °C
80 %
@Temperature 601 °F
 80 %
@Temperature 371 °C
80 %
@Temperature 700 °F
 11 %
@Diameter 12.7 mm
11 %
@Diameter 0.500 in
AA; Typical
Modulus of Elasticity 71.0 GPa10300 ksiAA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus.
 73.0 GPa10600 ksi
Compressive Yield Strength 460 MPa66700 psi0.1% Permanent Set
Poissons Ratio 0.330.33Estimated from trends in similar Al alloys.
Fatigue Strength 160 MPa
@# of Cycles 5.00e+8
23200 psi
@# of Cycles 5.00e+8
Shear Modulus 27.0 GPa3920 ksiEstimated from similar Al alloys.
Shear Strength 340 MPa49300 psiCalculated value.
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.00000500 ohm-cm0.00000500 ohm-cmEstimated from other heat treatments.
 
Thermal PropertiesMetricEnglishComments
CTE, linear  21.7 µm/m-°C
@Temperature -50.0 - 20.0 °C
12.1 µin/in-°F
@Temperature -58.0 - 68.0 °F
 23.4 µm/m-°C
@Temperature 20.0 - 100 °C
13.0 µin/in-°F
@Temperature 68.0 - 212 °F
AA; Typical; average over range
 23.5 µm/m-°C
@Temperature 20.0 - 100 °C
13.1 µin/in-°F
@Temperature 68.0 - 212 °F
 24.4 µm/m-°C
@Temperature 20.0 - 200 °C
13.6 µin/in-°F
@Temperature 68.0 - 392 °F
 25.4 µm/m-°C
@Temperature 20.0 - 300 °C
14.1 µin/in-°F
@Temperature 68.0 - 572 °F
Specific Heat Capacity 0.856 J/g-°C0.205 BTU/lb-°F
Thermal Conductivity 140 W/m-K972 BTU-in/hr-ft²-°FEstimated from other heat treatments.
Melting Point 477 - 629.4 °C890 - 1165 °FAA; Typical range based on typical composition for wrought products >= 1/4 in. thickness. Homogenization may raise eutectic melting temperature 20-40°F but usually does not eliminate it.
Solidus 477 °C890 °FAA; Typical
Liquidus 629.4 °C1165 °FAA; Typical
 
Processing PropertiesMetricEnglishComments
Annealing Temperature 413 °C775 °F
Solution Temperature 468 °C875 °F
Aging Temperature 121 °C250 °Ffor 24 hr
 
Component Elements PropertiesMetricEnglishComments
Aluminum, Al 85.3 - 89.5 %85.3 - 89.5 %As remainder
Chromium, Cr 0.18 - 0.28 %0.18 - 0.28 %
Copper, Cu 1.6 - 2.4 %1.6 - 2.4 %
Iron, Fe <= 0.50 %<= 0.50 %
Magnesium, Mg 2.4 - 3.1 %2.4 - 3.1 %
Manganese, Mn <= 0.30 %<= 0.30 %
Other, each <= 0.05 %<= 0.05 %
Other, total <= 0.15 %<= 0.15 %
Silicon, Si <= 0.40 %<= 0.40 %
Titanium, Ti <= 0.20 %<= 0.20 %
Zinc, Zn 6.3 - 7.3 %6.3 - 7.3 %

References for this datasheet.

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MA7178T76 / 9621

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