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EZ33A (EZ33A-T5, M12330) Magnesium

EZ33A magnesium is a magnesium alloy. It is typically furnished in the T5 temper. To achieve this temper, the metal is artificially aged until it meets standard mechanical property requirements. EZ33A is the ASTM designation for this material. M12330 is the UNS number.

It has the lowest tensile strength among magnesium alloys. In addition, it has a moderately high density and a fairly high base cost.

The graph bars on the material properties cards below compare EZ33A magnesium to other magnesium alloys (top) and the entire database (bottom).

Mechanical Properties

Brinell Hardness

55

Compressive (Crushing) Strength

310 MPa 45 x 103 psi

Elastic (Young's, Tensile) Modulus

45 GPa 6.5 x 106 psi

Elongation at Break

2.6 %

Fatigue Strength

70 MPa 10 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)

150 MPa 22 x 103 psi

Tensile Strength: Yield (Proof)

100 MPa 15 x 103 psi

Thermal Properties

Melting Completion (Liquidus)

640 °C 1190 °F

Melting Onset (Solidus)

570 °C 1050 °F

Solidification (Pattern Maker's) Shrinkage

1.6 %

Specific Heat Capacity

970 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

100 W/m-K 58 BTU/h-ft-°F

Thermal Expansion

27 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

24 % IACS

Electrical Conductivity: Equal Weight (Specific)

110 % IACS

Otherwise Unclassified Properties

Base Metal Price

25 % relative

Density

1.9 g/cm3 120 lb/ft3

Embodied Carbon

25 kg CO2/kg material

Embodied Energy

190 MJ/kg 83 x 103 BTU/lb

Embodied Water

930 L/kg 110 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

3.6 MJ/m3

Resilience: Unit (Modulus of Resilience)

120 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

61 points

Strength to Weight: Axial

22 points

Strength to Weight: Bending

33 points

Thermal Diffusivity

53 m2/s

Thermal Shock Resistance

9.2 points

Alloy Composition

Magnesium (Mg) 91.5 to 95.1
Zinc (Zn) 2.0 to 3.1
Zirconium (Zr) 0.4 to 1.0
Manganese (Mn) 0 to 0.15
Copper (Cu) 0 to 0.1
Silicon (Si) 0 to 0.010
Nickel (Ni) 0 to 0.010
Iron (Fe) 0 to 0.010
Unspecified Rare Earths 2.5 to 4.0
Residuals 0 to 0.3

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

Followup Questions

Similar Alloys

Further Reading

Magnesium Alloys Containing Rare Earth Metals: Structure and Properties, L.L. Rokhlin, 2003

ISO 16220: Magnesium and magnesium alloys - Magnesium alloy ingots and castings

ASTM B199: Standard Specification for Magnesium-Alloy Permanent Mold Castings

ASTM B403: Standard Specification for Magnesium-Alloy Investment Castings

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.