Aluminum 7178-T76; 7178-T7651

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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 Properties	Original Value	Comments

Density	2.83 g/cc	AA; Typical

Mechanical Properties	Original Value	Comments
Hardness, Brinell	152	500 kg load with 10 mm ball. Calculated value.
Hardness, Knoop	193	Converted from Brinell Hardness Value
Hardness, Rockwell A	53.9	Converted from Brinell Hardness Value
Hardness, Rockwell B	88	Converted from Brinell Hardness Value
Hardness, Vickers	177	Converted from Brinell Hardness Value
Tensile Strength, Ultimate	83.0 ksi	AA; Typical
	45.0 MPa @Temperature 371 °C
	59.0 MPa @Temperature 316 °C
	76.0 MPa @Temperature 260 °C
	105 MPa @Temperature 204 °C
	215 MPa @Temperature 149 °C
	475 MPa @Temperature 100 °C
	570 MPa @Temperature 24.0 °C
	605 MPa @Temperature -28.0 °C
	625 MPa @Temperature -80.0 °C
	730 MPa @Temperature -196 °C
Tensile Strength, Yield	73.0 ksi	AA; Typical
	38.0 MPa @Strain 0.2 %, Temperature 271 °C
	48.0 MPa @Strain 0.2 %, Temperature 316 °C
	62.0 MPa @Strain 0.2 %, Temperature 260 °C
	83.0 MPa @Strain 0.2 %, Temperature 204 °C
	185 MPa @Strain 0.2 %, Temperature 149 °C
	440 MPa @Strain 0.2 %, Temperature 100 °C
	505 MPa @Strain 0.2 %, Temperature 24.0 °C
	525 MPa @Strain 0.2 %, Temperature -28.0 °C
	540 MPa @Strain 0.2 %, Temperature -80.0 °C
	615 MPa @Strain 0.2 %, Temperature -196 °C
Elongation at Break	10 % @Temperature -196 °C
	10 % @Temperature -80.0 °C
	10 % @Temperature -28.0 °C
	11 % @Temperature 24.0 °C
	17 % @Temperature 100 °C
	40 % @Temperature 149 °C
	70 % @Temperature 204 °C
	76 % @Temperature 260 °C
	80 % @Temperature 316 °C
	80 % @Temperature 371 °C
	11 % @Diameter 12.7 mm	AA; Typical
Modulus of Elasticity	73.0 GPa
	10300 ksi	AA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus.
Compressive Yield Strength	460 MPa	0.1% Permanent Set
Poissons Ratio	0.33	Estimated from trends in similar Al alloys.
Fatigue Strength	160 MPa @# of Cycles 5.00e+8
Shear Modulus	27.0 GPa	Estimated from similar Al alloys.
Shear Strength	340 MPa	Calculated value.

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.00000500 ohm-cm	Estimated from other heat treatments.

Thermal Properties	Original Value	Comments
CTE, linear	13.0 µin/in-°F @Temperature 20.0 - 100 °C	AA; Typical; average over range
	21.7 µm/m-°C @Temperature -50.0 - 20.0 °C
	23.5 µm/m-°C @Temperature 20.0 - 100 °C
	24.4 µm/m-°C @Temperature 20.0 - 200 °C
	25.4 µm/m-°C @Temperature 20.0 - 300 °C
Specific Heat Capacity	0.856 J/g-°C
Thermal Conductivity	140 W/m-K	Estimated from other heat treatments.
Melting Point	890 - 1165 °F	AA; 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	890 °F	AA; Typical
Liquidus	1165 °F	AA; Typical

Processing Properties	Original Value	Comments
Annealing Temperature	775 °F
Solution Temperature	875 °F
Aging Temperature	250 °F	for 24 hr

Component Elements Properties	Original Value	Comments
Aluminum, Al	85.3 - 89.5 %	As remainder
Chromium, Cr	0.18 - 0.28 %
Copper, Cu	1.6 - 2.4 %
Iron, Fe	<= 0.50 %
Magnesium, Mg	2.4 - 3.1 %
Manganese, Mn	<= 0.30 %
Other, each	<= 0.05 %
Other, total	<= 0.15 %
Silicon, Si	<= 0.40 %
Titanium, Ti	<= 0.20 %
Zinc, Zn	6.3 - 7.3 %

References for this datasheet.

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MA7178T76 / 9621

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