Jul 15 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Applications
Introduction
Magnesium (Mg) is a widely used metal, and is found in over numerous minerals such as talc, magnesite, brucite, dolomite, carnallite, and olivine.
Magnesium alloys are light weight alloys that are highly sought after. Magnesium AZ91E-T4 is a cast alloy. It is a general purpose alloy with high strength.
The following datasheet gives an overview of magnesium AZ91E-T4 alloy.
Chemical Composition
The following table shows the chemical composition of magnesium AZ91E-T4 alloy.
Element |
Content (%) |
Magnesium, Mg |
88.51 - 91.22 |
Aluminum, Al |
8.1 - 9.3 |
Zinc, Zn |
0.40 - 1 |
Silicon, Si |
≤ 0.20 |
Manganese, Mn |
0.17 - 0.35 |
Copper, Cu |
0.015 |
Nickel, Ni |
≤ 0.0010 |
Iron, Fe |
≤ 0.0050 |
Physical Properties
The physical properties of magnesium AZ91E-T4 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 AZ91E-T4 alloy are outlined in the following table.
Properties |
Metric |
Imperial |
Tensile strength |
275 MPa |
39900 psi |
Yield strength (@strain 0.200 %) |
90 MPa |
13100 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) |
15% |
15% |
Hardness, Brinell |
55 |
55 |
Hardness, Knoop (estimated from Brinell) |
70 |
70 |
Hardness, Rockwell E |
62 |
62 |
Thermal Properties
The thermal properties of magnesium AZ91E-T4 alloy are highlighted in the following table.
Properties |
Metric |
Imperial |
Thermal expansion co-efficient (@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 AZ91E-T4 alloy are listed below:
-
EN 1753 MC 21120
-
ASTM B 94
-
SAE J465
Applications
Magnesium AZ91E-T4 alloy is used in pressure-tight sand and permanent mold castings with medium yield strength and high tensile strength.