Magnesium AZ92A-T7 Alloy (UNS M11920)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Magnesium is the eighth most abundant element in the earths crust. Magnesium alloys are easy to machine and process with conventional methods. Magnesium AZ92A-T7 alloy has good yield strength and high tensile strength.

The following datasheet gives an overview of magnesium AZ92A-T7 alloy.

Chemical Composition

The following table shows the chemical composition of magnesium AZ92A-T7 alloy.

Element Content (%)
Magnesium, Mg 89
Aluminum, Al 8.3 - 9.7
Zinc, Zn 1.6 - 2.4
Silicon, Si ≤ 0.30
Copper, Cu ≤ 0.25
Manganese, Mn ≥ 0.10
Nickel, Ni ≤ 0.010

Physical Properties

The physical properties of magnesium AZ92A-T7 alloy are given in the following table.

Properties Metric Imperial
Density 1.83 g/cm³ 0.0661 lb/in³

Mechanical Properties

The mechanical properties of cast magnesium AZ92A-T7 alloy are listed in the following table.

Properties Metric Imperial
Tensile strength 275 MPa 39900 psi
Yield strength (@ strain 0.2%) 145 MPa 21000 psi
Compressive yield strength (at 0.2% offset) 145 MPa 21000 psi
Shear strength 150 MPa 21800 psi
Fatigue strength (@# of cycles 5.00e+8) 90 MPa 13100 psi
Shear modulus 17 GPa 2470 ksi
Elastic modulus (in tension) 45 GPa 6530 ksi
Poisson's ratio 0.35 0.35
Elongation at break (in 50 mm) 3% 3%
Brinell hardness (500 kg load, 10 mm ball) 78 78
Knoop hardness (estimated from Brinell) 101 101
Rockwell E hardness 86 86
Vickers hardness (estimated from Brinell) 88 88
Machinability (relative rating, 100=best) 100 100

Thermal Properties

The following table outlines the thermal properties of magnesium AZ92A-T7 alloy.

Properties Metric Imperial
Thermal expansion co-efficient (@ 0-100°C/32-212°F) 26 µm/m°C 14.4 µin/in°F
Thermal conductivity 58.3 W/mK 405 BTU in/hr.ft².°F

Other Designations

Other designations that are equivalent to magnesium AZ92A-T7 alloy include:

  • SAE J465
  • AMS 4434
  • AMS 4453
  • AMS 4484
  • ASTM B 80
  • ASTM B 199
  • ASTM B 403


Magnesium AZ92A-T7 alloy is used for commercial and military pressure-tight sand and permanent-mold castings.

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