Magnesium AZ81A-T4 Cast Alloy (UNS M11810)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

Introduction

Magnesium alloys are normally used as cast alloys. Magnesium alloy castings can be produced by most of the traditional casting methods such as permanent, sand, semi permanent mold and shell, investment, and die-casting.

The following sections will discuss in detail about magnesium AZ81A-T4 cast alloy.

Chemical Composition

The chemical composition of magnesium AZ81A-T4 alloy is outlined in the following table.

Element Content (%)
Aluminum, Al 7.60
Zinc, Zn 0.70
Manganese, Mn 0.13
Magnesium, Mg Remainder

Physical Properties

The physical properties of magnesium AZ81A-T4 alloy are tabulated below.

Properties Metric Imperial
Density 1.80 g/cm3 0.0650 lb/in3
Melting point ≥ 421 °C ≥ 790 °F

Mechanical Properties

The following table shows mechanical properties of magnesium AZ81A-T4 alloy.

Properties Metric Imperial
Tensile strength 275 MPa 39900 psi
Yield strength 83 MPa 12000 ksi
Poisson’s ratio 0.34 0.34
Elongation at break 15% 15%
Hardness, Brinell 55 55
Hardness, Knoop 70 70
Hardness, Rockwell E 66 66
Machinability 100 100

Thermal Properties

The thermal properties of magnesium AZ81A-T4 alloy are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-200°C/68-392°F) 27.2 µm/m°C 15.1 µin/in°F
Thermal conductivity 51.1 W/mK 355 BTU in/hr.ft².°F

Other Designations

Equivalent materials to magnesium AZ81A-T4 alloy are as follows:

  • ASTM A276
  • ASTM A580
  • ASTM A412

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