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QE22A (QE22A-T6, 3.5106, M18220) Magnesium

QE22A 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. QE22A is the ASTM designation for this material. 3.5106 is the EN numeric designation. And M18220 is the UNS number.

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

The graph bars on the material properties cards below compare QE22A magnesium to other magnesium alloys (top) and the entire database (bottom).

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 13560 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

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)

110 % 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

12 points

Stiffness to Weight: Bending

60 points

Strength to Weight: Axial

36 points

Strength to Weight: Bending

45 points

Thermal Diffusivity

59 m2/s

Thermal Shock Resistance

15 points

Alloy Composition

Magnesium (Mg) 92.6 to 95.8
Silver (Ag) 2.0 to 3.0
Zirconium (Zr) 0.4 to 1.0
Zinc (Zn) 0 to 0.2
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 1.8 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

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

ASTM B403: Standard Specification for Magnesium-Alloy Investment Castings

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

Welding and Joining of Magnesium Alloys, Liming Liu ed., 2010

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