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AZ31B (3.5312, M11311) Magnesium

AZ31B magnesium is a magnesium alloy. AZ31B is the ASTM designation for this material. M11311 is the UNS number. Additionally, the ISO numeric designation is WD21151. It has a very high melting temperature and a moderately high thermal conductivity relative to other magnesium alloys.

The properties of AZ31B magnesium include four common variations. The property values on this page show 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 AZ31B magnesium to other magnesium alloys (top) and the entire database (bottom).

Mechanical Properties

Elastic (Young's, Tensile) Modulus

45 GPa 6.5 x 106 psi

Elongation at Break

5.6 to 12 %

Fatigue Strength

100 to 120 MPa 15 to 18 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

130 to 160 MPa 19 to 23 x 103 psi

Tensile Strength: Ultimate (UTS)

240 to 270 MPa 34 to 39 x 103 psi

Tensile Strength: Yield (Proof)

120 to 180 MPa 18 to 26 x 103 psi

Thermal Properties

Melting Onset (Solidus)

600 °C 1120 °F

Specific Heat Capacity

990 J/kg-K 0.24 BTU/lb-°F

Thermal Conductivity

100 W/m-K 60 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

18 % IACS

Electrical Conductivity: Equal Weight (Specific)

95 % IACS

Otherwise Unclassified Properties

Base Metal Price

12 % relative

Density

1.7 g/cm3 110 lb/ft3

Embodied Carbon

23 kg CO2/kg material

Embodied Energy

160 MJ/kg 67 x 103 BTU/lb

Embodied Water

970 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

13 to 25 MJ/m3

Resilience: Unit (Modulus of Resilience)

170 to 370 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

70 points

Strength to Weight: Axial

39 to 44 points

Strength to Weight: Bending

50 to 55 points

Thermal Diffusivity

62 m2/s

Thermal Shock Resistance

14 to 16 points

Alloy Composition

Magnesium (Mg) 93.6 to 97.1
Aluminum (Al) 2.4 to 3.6
Zinc (Zn) 0.5 to 1.5
Manganese (Mn) 0.050 to 1.0
Silicon (Si) 0 to 0.1
Iron (Fe) 0 to 0.050
Copper (Cu) 0 to 0.050
Calcium (Ca) 0 to 0.040
Nickel (Ni) 0 to 0.0050
Residuals 0 to 0.3

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

Followup Questions

Similar Alloys

Further Reading

ASTM B90: Standard Specification for Magnesium-Alloy Sheet and Plate

ASTM B107: Standard Specification for Magnesium-Alloy Extruded Bars, Rods, Profiles, Tubes, and Wire

ASTM B91: Standard Specification for Magnesium-Alloy Forgings

ISO 3116: Magnesium and magnesium alloys - Wrought magnesium alloys

Welding and Joining of Magnesium Alloys, Liming Liu (editor), 2010

Essential Readings in Magnesium Technology, Suveen N. Mathaudhu et al. (editors), 2014

Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.

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