Magnesium AZ92A-T5 Alloy (UNS M11920)

Topics Covered

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

Introduction

Magnesium is a silvery-white metal which is used as an alloy element for zinc, lead, aluminum, and other nonferrous alloys. Magnesium alloys have high strength and excellent vibration damping characteristics. Magnesium AZ92A-T5 alloy is ductile, and has moderate strength.

The following datasheet gives an overview of magnesium AZ92A-T5 alloy.

Chemical Composition

The following table shows the chemical composition of magnesium AZ92A-T5 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-T5 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-T5 alloy are listed in the following table.

Properties Metric Imperial
Tensile strength 170 MPa 24700 psi
Yield strength (@ strain 0.2%) 115 MPa 16700 psi
Compressive yield strength (at 0.2% offset) 115 MPa 16700 psi
Ultimate bearing strength 345 MPa 50000 psi
Bearing yield strength 315 MPa 45700 psi
Shear strength 140 MPa 20300 psi
Fatigue strength (@# of cycles 5e+8) 76 MPa 11000 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) 1% 1%
Brinell hardness (500 kg load, 10 mm ball) 69 69
Knoop hardness (estimated from Brinell) 92 92
Rockwell E hardness 80 80
Vickers hardness (estimated from Brinell) 79 79
Machinability (relative rating, 100=best) 100 100

Thermal Properties

The following table outlines the thermal properties of magnesium AZ92A-T5 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-T5 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-T5 alloy is can be welded using gas-shielded and arc-welding techniques. Stress relief is required after welding the alloy. The material is then aged at 260°C (500°F) for 4 h under the as-fabricated F condition.

Applications

Magnesium AZ92A-T5 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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