Magnesium AZ91C-T6 Alloy (UNS S13800)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Magnesium Azxx alloy series are known to possess good ductility, toughness, and moderate strength. They can be cast, formed, and forged. These alloys are more frequently used than others.

The following sections will discuss in detail about magnesium AZ91C-T6 alloy.

Chemical Composition

The chemical composition of magnesium AZ91C-T6 alloy is outlined in the following table.

Element Content (%)
Aluminum, Al 8.70
Zinc, Zn 0.70
Manganese, Mn 0.13
Magnesium, Mg Remainder

Physical Properties

The physical properties of magnesium AZ91C-T6 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 AZ91C-T6 alloy.

Properties Metric Imperial
Tensile strength 275 MPa 39900 psi
Yield strength 145 MPa 21000 psi
Poisson’s ratio 0.35 0.35
Elastic modulus 44.8 GPa 6500 ksi
Elongation 6% 6%
Hardness, Brinell 70 70
Hardness, Knoop 93 93
Hardness, Rockwell E 77 77
Hardness, Vickers 80 80

Thermal Properties

The thermal properties of magnesium AZ91C-T6 alloy are tabulated below.

Properties Conditions
T (°C) Treatment
Thermal conductivity 71.13 W/mK 0 T6
Thermal expansion 26 x 10-6/°C 20-100 T6

Other Designations

Equivalent materials to magnesium AZ91C-T6 alloy are as follows:

  • AMS 4437
  • ASTM B 80
  • ASTM B 403
  • SAE J465.

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