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QE22A (QE22A-T6, 3.5106, M18220) Magnesium

QE22A magnesium is a magnesium alloy. Cited properties are appropriate for the T6 temper. To achieve this temper, the metal is solution heat-treated and artificially aged until it meets standard mechanical property requirements. QE22A is the ASTM designation for this material. M18220 is the UNS number.

It has a very high density among magnesium alloys. In addition, it has a fairly high melting temperature and a fairly high embodied energy.

The graph bars on the material properties cards below compare QE22A 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

80

Compressive (Crushing) Strength

350 MPa 50 x 103 psi

Elastic (Young's, Tensile) Modulus

44 GPa 6.4 x 106 psi

Elongation at Break

2.4 %

Fatigue Strength

110 MPa 15 x 103 psi

Fracture Toughness

15 MPa-m1/2 14 x 103 psi-in1/2

Poisson's Ratio

0.29

Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

150 MPa 22 x 103 psi

Tensile Strength: Ultimate (UTS)

250 MPa 37 x 103 psi

Tensile Strength: Yield (Proof)

190 MPa 27 x 103 psi

Thermal Properties

Latent Heat of Fusion

340 J/g

Maximum Temperature: Mechanical

250 °C 480 °F

Melting Completion (Liquidus)

640 °C 1190 °F

Melting Onset (Solidus)

570 °C 1060 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

970 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

110 W/m-K 65 BTU/h-ft-°F

Thermal Expansion

27 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

25 % IACS

Electrical Conductivity: Equal Weight (Specific)

120 % IACS

Otherwise Unclassified Properties

Density

2.0 g/cm3 120 lb/ft3

Embodied Carbon

27 kg CO2/kg material

Embodied Energy

220 MJ/kg 95 x 103 BTU/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

5.5 MJ/m3

Resilience: Unit (Modulus of Resilience)

400 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

60 points

Strength to Weight: Axial

36 points

Strength to Weight: Bending

46 points

Thermal Diffusivity

59 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Magnesium (Mg) 93.1 to 95.8
Silver (Ag) 2.0 to 3.0
Zirconium (Zr) 0.4 to 1.0
Copper (Cu) 0 to 0.1
Nickel (Ni) 0 to 0.010
Unspecified Rare Earths 1.8 to 2.5
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

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.