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EN-MC65120 (MgRE3Zn2Zr) Magnesium

EN-MC65120 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. MC65120 is the EN numeric designation for this material. MgRE3Zn2Zr is the EN chemical designation. Additionally, the British Standard (BS) designation is MAG 6. And the AFNOR (French) designation is G-TR3Z2.

It has a very low 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 EN-MC65120 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

Elastic (Young's, Tensile) Modulus

45 GPa 6.5 x 106 psi

Elongation at Break

3.1 %

Fatigue Strength

80 MPa 12 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

92 MPa 13 x 103 psi

Tensile Strength: Ultimate (UTS)

160 MPa 23 x 103 psi

Tensile Strength: Yield (Proof)

110 MPa 16 x 103 psi

Thermal Properties

Latent Heat of Fusion

330 J/g

Maximum Temperature: Mechanical

180 °C 350 °F

Melting Completion (Liquidus)

590 °C 1100 °F

Melting Onset (Solidus)

520 °C 970 °F

Specific Heat Capacity

970 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

100 W/m-K 60 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

25 % IACS

Electrical Conductivity: Equal Weight (Specific)

120 % 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)

4.4 MJ/m3

Resilience: Unit (Modulus of Resilience)

140 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

62 points

Strength to Weight: Axial

23 points

Strength to Weight: Bending

34 points

Thermal Diffusivity

56 mm2/s

Thermal Shock Resistance

9.8 points

Alloy Composition

Magnesium (Mg) 91.8 to 95.1
Zinc (Zn) 2.0 to 3.0
Zirconium (Zr) 0.4 to 1.0
Manganese (Mn) 0 to 0.15
Copper (Cu) 0 to 0.030
Silicon (Si) 0 to 0.010
Iron (Fe) 0 to 0.010
Nickel (Ni) 0 to 0.0050
Unspecified Rare Earths 2.5 to 4.0
Residuals 0 to 0.010

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

Followup Questions

Similar Alloys

Further Reading

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

EN 1753: Magnesium and magnesium alloys. Magnesium alloy ingots and castings