Magnesium AZ91D-F Alloy (UNS M11916)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

Introduction

Magnesium is a silvery-white chemical element with the symbol Mg and atomic number 12. Magnesium alloys contain magnesium as the chief metal along with alloy elements such as lead, aluminum, zinc, and other non-ferrous alloys.

Magnesium alloys in the past were used only as cast alloys; however, with advanced technology available today, the wrought alloy version is also used. Magnesium AZ91D-F alloy is a cast alloy type.

The following datasheet gives an overview of magnesium AZ91D-F alloy.

Chemical Composition

The following table shows the chemical composition of magnesium AZ91D-F alloy.

Element Content (%)
Magnesium, Mg 90
Aluminum, Al 8.3 - 9.7
Zinc, Zn 0.35 - 1
Manganese, Mn ≥ 0.13
Silicon, Si ≤ 0.10
Copper, Cu ≤ 0.030
Iron, Fe ≤ 0.0050
Nickel, Ni ≤ 0.0020

Physical Properties

The physical properties of magnesium AZ91D-F alloy are given in the following table.

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

Mechanical Properties

The mechanical properties of magnesium AZ91D-F alloy are outlined in the following table.

Properties Metric Imperial
Tensile strength 230 MPa 33400 psi
Yield strength (at strain 0.200 %) 150 MPa 21800 psi
Elastic modulus 44.8 GPa 6500 ksi
Shear modulus 17 GPa 2470 ksi
Poisson's ratio 0.35 0.35
Elongation at break (in 50mm) 3% 3%
Hardness, Brinell 63 63
Hardness, Knoop (estimated from Brinell) 84 84
Hardness, Rockwell E 75 75
Hardness, Vickers (estimated from Brinell) 71 71

Thermal Properties

The thermal properties of magnesium AZ91D-F alloy are highlighted in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (at 0.000-100°C/ 32-212°F) 26 µm/m°C 14.4 µin/in°F
Thermal conductivity 72.7 W/mK 505 BTU in/hr.ft².°F

Other Designations

Equivalent materials to magnesium AZ91D-F alloy are listed below:

  • EN 1753 MC 21120
  • ASTM B 94
  • SAE J465

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