Aug 6 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications
Introduction
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 |
Applications
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.