Magnesium AZ91B-F (UNS M11912) Die Cast Alloy

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Magnesium Azxx alloys have moderate strength, good ductility and toughness and can be cast, formed, and forged.

The following sections will discuss in detail about magnesium AZ91B-F die cast alloy.

Chemical Composition

The chemical composition of magnesium AZ91B-F alloy is outlined in the following table.

Element Content (%)
Aluminum, Al 9
Zinc, Zn 0.7
Copper, Cu 0.30
Manganese, Mn 0.13
Magnesium, Mg Remainder

Physical Properties

The physical properties of magnesium AZ91B-F alloy are tabulated below.

Properties Metric Imperial
Density 1.81 g/cm3 0.0654 lb/in3
Melting point ≥ 421°C ≥ 790 °F

Mechanical Properties

The following table shows mechanical properties of magnesium AZ91B-F alloy.

Properties Metric Imperial
Tensile strength 230 MPa 33400 psi
Yield strength 150 MPa 21800 psi
Poisson’s ratio 0.35 0.35
Elastic modulus 44.8 GPa 6500 ksi
Elongation 3% 3%
Hardness, Brinell 63 63
Hardness, Knoop 84 84
Hardness, Rockwell E 75 75
Hardness, Vickers 71 71
Machinability 100 100

Thermal Properties

The thermal properties of magnesium AZ91B-F alloy are tabulated below.

Properties Conditions
T (°C) Treatment
Thermal conductivity 71.13 W/mK 0 F
Thermal expansion 26 x 10-6/°C 20-100 F

Other Designations

Equivalent materials to magnesium AZ91B-F alloy are as follows:

  • ASTM A276
  • ASTM A580

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