Magnesium AZ92A-T4 Alloy (UNS M11920)

Topics Covered

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

Introduction

Magnesium alloys harden rapidly with any type of cold work, and have good resistance to corrosion. Magnesium AZ92A-T4 alloy has good ductility and toughness, and it can be cast, formed, and forged.

The following datasheet gives an overview of magnesium AZ92A-T4 alloy.

Chemical Composition

The following table shows the chemical composition of magnesium AZ92A-T4 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-T4 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-T4 alloy are listed in the following table.

Properties Metric Imperial
Tensile strength 275 MPa 39900 psi
Yield strength (@ strain 0.200%) 97 MPa 14100 psi
Compressive yield strength (at 0.2% offset) 97 MPa 14100 psi
Ultimate bearing strength 470 MPa 68200 psi
Bearing yield strength 315 MPa 45700 psi
Shear strength 140 MPa 20300 psi
Fatigue strength (@# of cycles 1.00e+8) 40 MPa 5800 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) 10% 10%
Brinell hardness (500 kg load, 10 mm ball) 63 63
Knoop hardness (estimated from Brinell) 84 84
Rockwell E hardness 75 75
Vickers hardness (estimated from Brinell) 70 70
Machinability (relative rating, 100=best) 100 100

Thermal Properties

The following table outlines the thermal properties of magnesium AZ92A-T4 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 44.3 W/mK 307 BTU in/hr.ft².°F

Other Designations

Other designations that are equivalent to magnesium AZ92A-T4 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-T4 alloy is a weldable casting alloy. It can be welded using gas-shielded and arc-welding methods. Stress relief is required after welding the alloy. The alloy is then heat-treated at 410°C (765°F) for 16 to 24 h.

Applications

Magnesium AZ92A-T4 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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