Magnesium AZ91D Cast Alloy

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties


Magnesium alloys are some of lightest structural materials around. Magnesium AZ91D cast alloy is a high-purity alloy that has excellent corrosion resistance, excellent castablilty and good strength. It is the most commonly used magnesium die casting alloy.

The following sections will discuss magnesium AZ91D cast alloy in further detail.

Chemical Composition

The chemical composition of magnesium AZ91D cast alloy is outlined in the following table.

Element Content (%)
Aluminum, Al 8.3-9.7
Manganese, Mn 0.15-0.50
Zinc, Zn 0.35-1
Silicon, Si 0.1
Copper, Cu 0.03
Iron, Fe 0.005
Nickel, Ni 0.002
Others, each max 0.02
Magnesium, Mg Remainder

Physical Properties

The physical properties of magnesium AZ91D cast alloy are tabulated below.

Properties Metric Imperial
Density 1.81 g/cm3 1.046 lb/in3

Mechanical Properties

The following table shows mechanical properties of magnesium AZ91D cast alloy.

Properties Metric Imperial
Tensile strength 240-250 MPa 35-36 ksi
Yield strength 160 MPa 23.20 ksi
Elastic modulus 45 GPa 6526 ksi
Elongation 3-7 % 3-7 %
Hardness 63 63

Thermal Properties

The thermal properties of magnesium AZ91D cast alloy are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (at 20-100°C/68-212°F) 26 µm/m°C 14.4 µin/in°F
Thermal conductivity (at 20°C/68°F) 72.7 W/mK 504 BTU in/hr.ft².°F


Magnesium AZ91D cast alloy is used in several components. Some of them are listed below:

  • Covers
  • Housings
  • Handheld tools
  • Sporting goods
  • Computer parts
  • Mobile and telephones
  • Household equipment
  • Automobile components.


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