Jul 31 2013
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