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AZ63A (M11630) Magnesium

AZ63A magnesium is a magnesium alloy. AZ63A is the ASTM designation for this material. M11630 is the UNS number. It has a very low embodied energy among magnesium alloys. In addition, it has a fairly low melting temperature and can have a moderately low thermal conductivity.

The properties of AZ63A 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 AZ63A 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

46 GPa 6.7 x 106 psi

Elongation at Break

2.2 to 8.0 %

Fatigue Strength

76 to 83 MPa 11 to 12 x 103 psi

Poisson's Ratio


Shear Modulus

18 GPa 2.6 x 106 psi

Shear Strength

110 to 160 MPa 16 to 23 x 103 psi

Tensile Strength: Ultimate (UTS)

190 to 270 MPa 28 to 39 x 103 psi

Tensile Strength: Yield (Proof)

81 to 120 MPa 12 to 18 x 103 psi

Thermal Properties

Latent Heat of Fusion

350 J/g

Maximum Temperature: Mechanical

120 °C 250 °F

Melting Completion (Liquidus)

610 °C 1130 °F

Melting Onset (Solidus)

450 °C 850 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

980 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

52 to 65 W/m-K 30 to 38 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

12 to 15 % IACS

Electrical Conductivity: Equal Weight (Specific)

59 to 74 % IACS

Otherwise Unclassified Properties

Base Metal Price

12 % relative


1.8 g/cm3 110 lb/ft3

Embodied Carbon

22 kg CO2/kg material

Embodied Energy

150 MJ/kg 66 x 103 BTU/lb

Embodied Water

970 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

3.7 to 16 MJ/m3

Resilience: Unit (Modulus of Resilience)

71 to 160 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

66 points

Strength to Weight: Axial

29 to 41 points

Strength to Weight: Bending

40 to 51 points

Thermal Diffusivity

29 to 37 mm2/s

Thermal Shock Resistance

11 to 16 points

Alloy Composition

Magnesium (Mg)Mg 88.6 to 92.1
Aluminum (Al)Al 5.3 to 6.7
Zinc (Zn)Zn 2.5 to 3.5
Manganese (Mn)Mn 0.15 to 0.35
Silicon (Si)Si 0 to 0.3
Copper (Cu)Cu 0 to 0.25
Nickel (Ni)Ni 0 to 0.010
Residualsres. 0 to 0.3

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

Followup Questions

Similar Alloys

Further Reading

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

ASTM B80: Standard Specification for Magnesium-Alloy Sand Castings

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