Magnesium AZ92A-T6 Alloy (UNS M11920)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Applications

Introduction

Magnesium is highly flammable in its pure form and soluble in water. It is used as an alloy element for aluminum, lead, zinc and other nonferrous alloys. Magnesium AZ92A-T6 alloy is ductile, and has good castability and moderate strength.

The following datasheet gives an overview of magnesium AZ92A-T6 alloy.

Chemical Composition

The following table shows the chemical composition of magnesium AZ92A-T6 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-T6 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-T6 alloy are listed in the following table.

Properties Metric Imperial
Tensile strength 275 MPa 39900 psi
Yield strength (@ strain 0.2%) 150 MPa 21800 psi
Compressive yield strength (at 0.2% offset) 150 MPa 21800 psi
Ultimate bearing strength 550 MPa 79800 psi
Bearing yield strength 450 MPa 65300 psi
Shear strength 150 MPa 21800 psi
Fatigue strength (@# of cycles 1.00e+8) 30 MPa 4350 psi
Shear modulus 17 GPa 2470 ksi
Elastic modulus 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) 84 84
Knoop hardness (estimated from Brinell) 108 108
Rockwell A hardness (estimated from Brinell) 36 36
Rockwell B hardness (estimated from Brinell) 52 52
Rockwell E hardness 88 88
Vickers hardness (estimated from Brinell) 95 95
Machinability (relative rating, 100=best) 100 100

Thermal Properties

The following table outlines the thermal properties of magnesium AZ92A-T6 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-T6 alloy include:

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

Fabrication and Heat Treatment

Magnesium AZ92A-T6 alloy is commonly welded using arc-welding and gas-shielded techniques. It is stress-relieved after welding. The material is then heat-treated at 410°C (765°F) for 16 to 24 h. The castings are then cooled to room temperature. This process is followed by aging at 218°C (425°F) for 5 h.

Applications

Magnesium AZ92A-T6 alloy is usually used in sand casting and permanent mold casting.

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