Magnesium AZ91E-T6 Alloy (UNS M11919)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Magnesium (Mg) has the atomic number 12. It is a widely used metal, and is found in over 60 minerals.

Magnesium alloys are used in many engineering applications where light weight feature is a major advantage. Magnesium AZ91E-T6 is a cast alloy. It is a general purpose alloy with high strength.

The following datasheet gives an overview of magnesium AZ91E-T6 alloy.

Chemical Composition

The following table shows the chemical composition of magnesium AZ91E-T6 alloy.

Element Content (%)
Magnesium, Mg 88.51 - 91.22
Aluminum, Al 8.1 - 9.3
Zinc, Zn 0.40 - 1
Silicon, Si ≤ 0.20
Manganese, Mn 0.17 - 0.35
Copper, Cu ≤ 0.015
Nickel, Ni ≤ 0.0010
Iron, Fe ≤ 0.0050

Physical Properties

The physical properties of magnesium AZ91E-T6 alloy are given in the following table.

Properties Metric Imperial
Density 1.81 g/cm³ 0.0654 lb/in³
Melting point ≥ 421 °C ≥ 790 °F

Mechanical Properties

The mechanical properties of magnesium AZ91E-T6 alloy are outlined in the following table.

Properties Metric Imperial
Tensile strength 275 MPa 39900 psi
Yield strength (@strain 0.200 %) 145 MPa 21000 psi
Elastic modulus 44.8 GPa 6500 ksi
Shear modulus 17 GPa 2470 ksi
Poisson's ratio 0.35 0.35
Elongation at break (in 50mm) 6% 6%
Hardness, Brinell 70 70
Hardness, Knoop (estimated from Brinell) 93 93
Hardness, Rockwell E 77 77
Hardness, Vickers (estimated from Brinell) 80 80

Thermal Properties

The thermal properties of magnesium AZ91E-T6 alloy are highlighted in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@0.000-100°C/ 32-212°F) 26 µm/m°C 14.4 µin/in°F
Thermal conductivity 72.7 W/mK 505 BTU in/hr.ft².°F

Other Designations

Equivalent materials to magnesium AZ91E-T6 alloy are listed below:

  • EN 1753 MC 21120
  • AMS 4446
  • ASTM B 94
  • SAE J465


The following are the applications of magnesium AZ91E-T6 alloy:

  • In pressure-tight sand and permanent mold castings with medium yield strength and high tensile strength.

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