Magnesium AZ92A-F Alloy (UNS M11920)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Applications

Introduction

Magnesium alloys are used for both cast and forged components, and have the ability to absorb energy elastically owing to their low modulus of elasticity. Magnesium AZ92A-F alloy can be cast, formed, and forged. It has good ductility and toughness and moderate strength.

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

Chemical Composition

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

Properties Metric Imperial
Tensile strength 365 MPa 52900 psi
Yield strength (at strain 0.2%) 305 MPa 44200 psi
Compressive yield strength (at 0.2% offset) 250 MPa 36300 psi
Ultimate bearing strength 585 MPa 84800 psi
Bearing yield strength 405 MPa 58700 psi
Fatigue strength (at number of cycles 1.00e+8) 55 MPa 7890 psi
Shear strength 125 MPa 18100 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) 2% 2%
Brinell hardness (500 kg load, 10 mm ball) 65 65
Knoop hardness (estimated from Brinell) 88 88
Rockwell E hardness 76 76
Vickers hardness (estimated from Brinell) 75 75
Machinability (relative rating, 100=best) 100 100

Thermal Properties

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

Properties Metric Imperial
Thermal expansion co-efficient (at 0-100°C/32-212°F) 26 µm/m°C 14.4 µin/in°F
Thermal conductivity 52.2 W/mK 362 BTU in/hr.ft².°F

Other Designations

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

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

Applications

Magnesium AZ92A-F alloy is typically used for commercial and military pressure-tight sand and permanent-mold castings that have high yield and tensile strengths.

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