Jun 26 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Applications
Introduction
Magnesium is the eighth most abundant element in the earths crust. Magnesium alloys are easy to machine and process with conventional methods. Magnesium AZ92A-T7 alloy has good yield strength and high tensile strength.
The following datasheet gives an overview of magnesium AZ92A-T7 alloy.
Chemical Composition
The following table shows the chemical composition of magnesium AZ92A-T7 alloy.
|
Element |
Content (%) |
|
Magnesium, Mg |
89 |
|
Aluminum, Al |
8.3 - 9.7 |
|
Zinc, Zn |
1.6 - 2.4 |
|
Silicon, Si |
≤ 0.30 |
|
Copper, Cu |
≤ 0.25 |
|
Manganese, Mn |
≥ 0.10 |
|
Nickel, Ni |
≤ 0.010 |
Physical Properties
The physical properties of magnesium AZ92A-T7 alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
1.83 g/cm³ |
0.0661 lb/in³ |
Mechanical Properties
The mechanical properties of cast magnesium AZ92A-T7 alloy are listed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
275 MPa |
39900 psi |
|
Yield strength (@ strain 0.2%) |
145 MPa |
21000 psi |
|
Compressive yield strength (at 0.2% offset) |
145 MPa |
21000 psi |
|
Shear strength |
150 MPa |
21800 psi |
|
Fatigue strength (@# of cycles 5.00e+8) |
90 MPa |
13100 psi |
|
Shear modulus |
17 GPa |
2470 ksi |
|
Elastic modulus (in tension) |
45 GPa |
6530 ksi |
|
Poisson's ratio |
0.35 |
0.35 |
|
Elongation at break (in 50 mm) |
3% |
3% |
|
Brinell hardness (500 kg load, 10 mm ball) |
78 |
78 |
|
Knoop hardness (estimated from Brinell) |
101 |
101 |
|
Rockwell E hardness |
86 |
86 |
|
Vickers hardness (estimated from Brinell) |
88 |
88 |
|
Machinability (relative rating, 100=best) |
100 |
100 |
Thermal Properties
The following table outlines the thermal properties of magnesium AZ92A-T7 alloy.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@ 0-100°C/32-212°F) |
26 µm/m°C |
14.4 µin/in°F |
|
Thermal conductivity |
58.3 W/mK |
405 BTU in/hr.ft².°F |
Other Designations
Other designations that are equivalent to magnesium AZ92A-T7 alloy include:
-
SAE J465
-
AMS 4434
-
AMS 4453
-
AMS 4484
-
ASTM B 80
-
ASTM B 199
-
ASTM B 403
Applications
Magnesium AZ92A-T7 alloy is used for commercial and military pressure-tight sand and permanent-mold castings.