EZ33A (EZ33A-T5, M12330) Magnesium

EZ33A magnesium is an alloy of magnesium. It is typically furnished in the T5 temper. EZ33A is the ASTM designation for this material. M12330 is the UNS number.

Material Properties

Base Metal Price41 % rel

Brinell Hardness55

Compressive (Crushing) Strength310 MPa (45 x 103 psi)

Density2.1 g/cm3 (130 lb/ft3)

Elastic (Young's, Tensile) Modulus44 GPa (6.4 x 106 psi)

Electrical Conductivity24 % IACS

Electrical Resistivity Order of Magnitude-7 10x Ω-m

Elongation at Break2.7 %

Fatigue Strength (Endurance Limit)61 MPa (8.8 x 103 psi)

Melting Onset (Solidus)570 °C (1060 °F)

Modulus of Resilience (Unit Resilience)110 kJ/m3

Poisson's Ratio0.29

Shear Strength140 MPa (20 x 103 psi)

Solidification (Pattern Maker's) Shrinkage1.6 %

Specific Heat Capacity1050 J/kg-K

Strength to Weight Ratio71 kN-m/kg

Tensile Strength: Ultimate (UTS)150 MPa (22 x 103 psi)

Tensile Strength: Yield (Proof)100 MPa (15 x 103 psi)

Thermal Conductivity100 W/m-K

Thermal Diffusivity45 m2/s

Thermal Expansion27 µm/m-K

Unit Rupture Work (Ultimate Resilience)3.6 MJ/m3

The length of each bar compares the given value to the highest value in the database.

Alloy Composition

Magnesium (Mg)91.5 to 95 %

Unspecified Rare Earths2.5 to 4.0 %

Zinc (Zn)2.0 to 3.1 %

Zirconium (Zr)0.5 to 1.0 %

Residuals0 to 0.3 %

Copper (Cu)0 to 0.1 %

Nickel (Ni)0 to 0.010 %

Further Reading

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

ASTM B403: Standard Specification for Magnesium-Alloy Investment Castings

ASTM B80: Standard Specification for Magnesium-Alloy Sand Castings

Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.