EZ33A (EZ33A-T5, M12330) Magnesium
EZ33A magnesium is a magnesium alloy. Cited properties are appropriate for 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 melting temperature.
The graph bars on the material properties cards below compare EZ33A 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
Brinell Hardness
55
Compressive (Crushing) Strength
310 MPa 45 x 103 psi
Elastic (Young's, Tensile) Modulus
44 GPa 6.4 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
Latent Heat of Fusion
330 J/g
Maximum Temperature: Mechanical
250 °C 480 °F
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
54 mm2/s
Thermal Shock Resistance
9.2 points
Alloy Composition
| Mg | 91.5 to 95 | |
| Zn | 2.0 to 3.1 | |
| Zr | 0.5 to 1.0 | |
| Cu | 0 to 0.1 | |
| Ni | 0 to 0.010 | |
| rare e. | 2.5 to 4.0 | |
| res. | 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
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.
Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012