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ZE63A (ZE63A-T6, M16630) Magnesium

ZE63A magnesium is a magnesium alloy. It is typically furnished in the T6 temper. To achieve this temper, the metal is solution heat-treated and artificially aged until it meets standard mechanical property requirements. ZE63A is the ASTM designation for this material. M16630 is the UNS number.

It has the lowest melting temperature among magnesium alloys. In addition, it has a very high density and a moderately high electrical conductivity.

The graph bars on the material properties cards below compare ZE63A magnesium to other magnesium alloys (top) and the entire database (bottom).

Mechanical Properties

Brinell Hardness


Compressive (Crushing) Strength

450 MPa 65 x 103 psi

Elastic (Young's, Tensile) Modulus

46 GPa 6.6 x 106 psi

Elongation at Break

7.7 %

Fatigue Strength

120 MPa 17 x 103 psi

Fracture Toughness

27 MPa-m1/2 24570 psi-in1/2

Poisson's Ratio


Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

170 MPa 25 x 103 psi

Tensile Strength: Ultimate (UTS)

300 MPa 43 x 103 psi

Tensile Strength: Yield (Proof)

190 MPa 28 x 103 psi

Thermal Properties

Melting Completion (Liquidus)

510 °C 950 °F

Melting Onset (Solidus)

390 °C 730 °F

Solidification (Pattern Maker's) Shrinkage

1.6 %

Specific Heat Capacity

950 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

110 W/m-K 64 BTU/h-ft-°F

Thermal Expansion

27 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

31 % IACS

Electrical Conductivity: Equal Weight (Specific)

140 % IACS

Otherwise Unclassified Properties

Base Metal Price

22 % relative


2.0 g/cm3 130 lb/ft3

Embodied Carbon

24 kg CO2/kg material

Embodied Energy

180 MJ/kg 79 x 103 BTU/lb

Embodied Water

920 L/kg 110 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

20 MJ/m3

Resilience: Unit (Modulus of Resilience)

400 kJ/m3

Stiffness to Weight: Axial

12 points

Stiffness to Weight: Bending

58 points

Strength to Weight: Axial

40 points

Strength to Weight: Bending

48 points

Thermal Diffusivity

57 m2/s

Thermal Shock Resistance

17 points

Alloy Composition

Magnesium (Mg) 89.6 to 92
Zinc (Zn) 5.5 to 6.0
Zirconium (Zr) 0.4 to 1.0
Copper (Cu) 0 to 0.1
Nickel (Ni) 0 to 0.010
Unspecified Rare Earths 2.1 to 3.0
Residuals 0 to 0.3

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

Followup Questions

Similar Alloys

Further Reading

ASTM B80: Standard Specification for Magnesium-Alloy Sand Castings

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