Aluminum 2218-T71

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Aluminum 2218-T71
Categories:	Metal; Nonferrous Metal; Aluminum Alloy; 2000 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:	Aluminium 2218-T72; UNS A92218; AMS 4142; NF A-U4N (France); QQ-A-367; SAE J454; AA2218-T72; Al2218-T71
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Physical Properties	Metric	English	Comments

Density	2.81 g/cc	0.102 lb/in³	AA; Typical

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	105	105	500 kg load with 10 mm ball
Hardness, Knoop	132	132	Converted from Brinell Hardness Value
Hardness, Rockwell A	43	43	Converted from Brinell Hardness Value
Hardness, Rockwell B	66	66	Converted from Brinell Hardness Value
Hardness, Vickers	118	118	Converted from Brinell Hardness Value
Tensile Strength, Ultimate	345 MPa	50000 psi
Tensile Strength, Yield	280 MPa	40600 psi
Elongation at Break	11 %	11 %	In 5 cm; Sample 1.6 mm thick
Modulus of Elasticity	74.4 GPa	10800 ksi	Average of Tension and Compression. In Al alloys, the compressive modulus is typically 2% greater than the tensile modulus
Poissons Ratio	0.33	0.33
Shear Modulus	27.5 GPa	3990 ksi
Shear Strength	207 MPa	30000 psi	Calculated value.

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.00000430 ohm-cm	0.00000430 ohm-cm	Estimated from other heat treatments.

Thermal Properties	Metric	English	Comments
CTE, linear	20.7 µm/m-°C @Temperature -50.0 - 20.0 °C	11.5 µin/in-°F @Temperature -58.0 - 68.0 °F
	22.3 µm/m-°C @Temperature 20.0 - 100 °C	12.4 µin/in-°F @Temperature 68.0 - 212 °F	AA; Typical; average over range
	22.4 µm/m-°C @Temperature 20.0 - 100 °C	12.4 µin/in-°F @Temperature 68.0 - 212 °F
	23.3 µm/m-°C @Temperature 20.0 - 200 °C	12.9 µin/in-°F @Temperature 68.0 - 392 °F
	24.2 µm/m-°C @Temperature 20.0 - 300 °C	13.4 µin/in-°F @Temperature 68.0 - 572 °F
Specific Heat Capacity	0.880 J/g-°C	0.210 BTU/lb-°F	Estimated from trends in similar Al alloys.
Thermal Conductivity	155 W/m-K	1080 BTU-in/hr-ft²-°F
Melting Point	502 - 638 °C	935 - 1180 °F	AA; Typical range based on typical composition for wrought products >= 1/4 in. thickness. Eutectic melting is not eliminated by homogenization.
Solidus	502 °C	935 °F	AA; Typical
Liquidus	638 °C	1180 °F	AA; Typical

Processing Properties	Metric	English	Comments
Solution Temperature	510 °C	950 °F

Component Elements Properties	Metric	English	Comments
Aluminum, Al	88.8 - 93.6 %	88.8 - 93.6 %	As remainder
Chromium, Cr	<= 0.10 %	<= 0.10 %
Copper, Cu	3.5 - 4.5 %	3.5 - 4.5 %
Iron, Fe	<= 1.0 %	<= 1.0 %
Magnesium, Mg	1.2 - 1.8 %	1.2 - 1.8 %
Manganese, Mn	<= 0.20 %	<= 0.20 %
Nickel, Ni	1.7 - 2.3 %	1.7 - 2.3 %
Other, each	<= 0.05 %	<= 0.05 %
Other, total	<= 0.15 %	<= 0.15 %
Silicon, Si	<= 0.90 %	<= 0.90 %
Zinc, Zn	<= 0.25 %	<= 0.25 %

References for this datasheet.

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MA2218T71 / 8924

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