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AZ31B-O Magnesium

AZ31B-O magnesium is AZ31B magnesium in the annealed condition. It has the lowest strength and highest ductility compared to the other variants of AZ31B magnesium. The graph bars on the material properties cards below compare AZ31B-O magnesium to other magnesium alloys (top) 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

56

Elastic (Young's, Tensile) Modulus

45 GPa 6.5 x 106 psi

Elongation at Break

12 %

Fatigue Strength

120 MPa 18 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

140 MPa 21 x 103 psi

Tensile Strength: Ultimate (UTS)

240 MPa 34 x 103 psi

Tensile Strength: Yield (Proof)

120 MPa 18 x 103 psi

Thermal Properties

Latent Heat of Fusion

350 J/g

Maximum Temperature: Mechanical

150 °C 300 °F

Melting Completion (Liquidus)

600 °C 1110 °F

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)

25 MJ/m3

Resilience: Unit (Modulus of Resilience)

170 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

70 points

Strength to Weight: Axial

39 points

Strength to Weight: Bending

50 points

Thermal Diffusivity

62 mm2/s

Thermal Shock Resistance

14 points

Alloy Composition

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

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

Followup Questions

Further Reading

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

Advances in Wrought Magnesium Alloys: Fundamentals of Processing, Properties and Applications, Colleen Bettles and Matthew Barnett (editors), 2012

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

Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012

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