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3105 (AlMn0.5Mg0.5, 3.0505, N31, A93105) Aluminum

3105 aluminum is a 3000-series aluminum alloy: the main alloying addition is manganese, and it is formulated for primary forming into wrought products. 3105 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-3105. N31 is the British Standard (BS) designation. A93105 is the UNS number. Additionally, the EN chemical designation is AlMn0,5Mg0,5.

It originally received its standard designation in 1960.

The properties of 3105 aluminum include twelve 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 3105 aluminum to: 3000-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

Brinell Hardness

29 to 67

Elastic (Young's, Tensile) Modulus

69 GPa 10 x 106 psi

Elongation at Break

1.1 to 20 %

Fatigue Strength

39 to 95 MPa 5.7 to 14 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.8 x 106 psi

Shear Strength

77 to 140 MPa 11 to 20 x 103 psi

Tensile Strength: Ultimate (UTS)

120 to 240 MPa 17 to 35 x 103 psi

Tensile Strength: Yield (Proof)

46 to 220 MPa 6.6 to 31 x 103 psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

180 °C 360 °F

Melting Completion (Liquidus)

660 °C 1210 °F

Melting Onset (Solidus)

640 °C 1180 °F

Specific Heat Capacity

900 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

170 W/m-K 98 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

44 % IACS

Electrical Conductivity: Equal Weight (Specific)

140 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Calomel Potential

-750 mV

Density

2.8 g/cm3 170 lb/ft3

Embodied Carbon

8.2 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)

2.6 to 19 MJ/m3

Resilience: Unit (Modulus of Resilience)

15 to 340 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

50 points

Strength to Weight: Axial

12 to 24 points

Strength to Weight: Bending

20 to 31 points

Thermal Diffusivity

68 mm2/s

Thermal Shock Resistance

5.2 to 11 points

Alloy Composition

Among wrought aluminum alloys, the composition of 3105 aluminum is notable for containing comparatively high amounts of manganese (Mn) and magnesium (Mg). Manganese is used to improve strength without a proportional reduction in ductility. It also improves workability by controlling the grain structure of the alloy. Magnesium promotes hardenability through both heat treatment and strain hardening mechanisms. It also increases susceptibility to intergranular corrosion.

Aluminum (Al) 96 to 99.5
Manganese (Mn) 0.3 to 0.8
Magnesium (Mg) 0.2 to 0.8
Iron (Fe) 0 to 0.7
Silicon (Si) 0 to 0.6
Zinc (Zn) 0 to 0.4
Copper (Cu) 0 to 0.3
Chromium (Cr) 0 to 0.2
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

ASTM B209: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate

EN 485-2: Aluminium and aluminium alloys. Sheet, strip and plate. Mechanical properties

Aluminum Standards and Data, Aluminum Association Inc., 2013

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015