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5042 (AlMg3.5Mn) Aluminum

5042 aluminum is a 5000-series aluminum alloy: the main alloying addition is magnesium, and it is formulated for primary forming into wrought products. 5042 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-5042. Additionally, the EN chemical designation is AlMg3,5Mn. And the UNS number is A95042.

It originally received its standard designation in 1980.

The properties of 5042 aluminum include four common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 5042 aluminum to: 5000-series alloys (top), all aluminum alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

68 GPa 9.9 x 106 psi

Elongation at Break

1.1 to 3.4 %

Fatigue Strength

97 to 120 MPa 14 to 18 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.7 x 106 psi

Shear Strength

200 MPa 29 to 30 x 103 psi

Tensile Strength: Ultimate (UTS)

340 to 360 MPa 50 to 52 x 103 psi

Tensile Strength: Yield (Proof)

270 to 310 MPa 39 to 45 x 103 psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

180 °C 360 °F

Melting Completion (Liquidus)

640 °C 1190 °F

Melting Onset (Solidus)

570 °C 1060 °F

Specific Heat Capacity

900 J/kg-K 0.22 BTU/lb-°F

Thermal Conductivity

130 W/m-K 75 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

33 % IACS

Electrical Conductivity: Equal Weight (Specific)

110 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Density

2.7 g/cm3 170 lb/ft3

Embodied Carbon

8.8 kg CO2/kg material

Embodied Energy

150 MJ/kg 66 x 103 BTU/lb

Embodied Water

1180 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

3.6 to 12 MJ/m3

Resilience: Unit (Modulus of Resilience)

550 to 720 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

50 points

Strength to Weight: Axial

35 to 37 points

Strength to Weight: Bending

40 to 42 points

Thermal Diffusivity

53 mm2/s

Thermal Shock Resistance

15 to 16 points

Alloy Composition

Among wrought aluminum alloys, the composition of 5042 aluminum is notable for containing a comparatively high amount of magnesium (Mg). Magnesium promotes hardenability through both heat treatment and strain hardening mechanisms. It also increases susceptibility to intergranular corrosion.

Aluminum (Al) 94.2 to 96.8
Magnesium (Mg) 3.0 to 4.0
Manganese (Mn) 0.2 to 0.5
Iron (Fe) 0 to 0.35
Zinc (Zn) 0 to 0.25
Silicon (Si) 0 to 0.2
Copper (Cu) 0 to 0.15
Chromium (Cr) 0 to 0.1
Titanium (Ti) 0 to 0.1
Residuals 0 to 0.15

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ISO 6361-2: Wrought aluminium and aluminium alloys - Sheets, strips and plates - Part 2: Mechanical properties

EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993