Aluminum 2218-T72

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Aluminum 2218-T72
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-T72
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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	95	95	AA; Typical; 500 g load; 10 mm ball
Hardness, Knoop	120	120	Converted from Brinell Hardness Value
Hardness, Rockwell A	39.5	39.5	Converted from Brinell Hardness Value
Hardness, Rockwell B	60	60	Converted from Brinell Hardness Value
Hardness, Vickers	107	107	Converted from Brinell Hardness Value
Tensile Strength, Ultimate	331 MPa	48000 psi	AA; Typical
Tensile Strength, Yield	255 MPa	37000 psi	AA; Typical
Elongation at Break	11 % @Diameter 12.7 mm	11 % @Diameter 0.500 in	AA; Typical
Modulus of Elasticity	74.5 GPa	10800 ksi	AA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus.
Poissons Ratio	0.33	0.33
Shear Modulus	27.5 GPa	3990 ksi
Shear Strength	207 MPa	30000 psi	AA; Typical

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.00000432 ohm-cm @Temperature 20.0 °C	0.00000432 ohm-cm @Temperature 68.0 °F	AA; Typical

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	154 W/m-K	1070 BTU-in/hr-ft²-°F	AA; Typical at 77°F
Melting Point	504 - 635.0 °C	940 - 1175 °F	AA; Typical range based on typical composition for wrought products >= 1/4 in. thickness. Eutectic melting is not eliminated by homogenization.
Solidus	504 °C	940 °F	AA; Typical
Liquidus	635.0 °C	1175 °F	AA; Typical

Processing Properties	Metric	English	Comments
Solution Temperature	510 °C	950 °F
Aging Temperature	238 °C	460 °F	for 6 hr at temperature

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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MA2218T72 / 8925

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