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CURRENT LOCATION:NEWS >> Company's News >> AZ31B (3.5312, M11311) Magnesium

AZ31B (3.5312, M11311) Magnesium

Writer:Vera ChengSource:INTERNATIONAL SALES Date:2018-11-30

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 among the magnesium alloys in the database.

The properties of AZ31B magnesium 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 AZ31B 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

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



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

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



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

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

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


TypeInfo: Company's News

Keywords for the information:AZ31B magnesium alloy