May 27 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Applications
Introduction
Magnesium is highly flammable in its pure form and soluble in water. It is used as an alloy element for aluminum, lead, zinc and other nonferrous alloys. Magnesium AZ92A-T6 alloy is ductile, and has good castability and moderate strength.
The following datasheet gives an overview of magnesium AZ92A-T6 alloy.
Chemical Composition
The following table shows the chemical composition of magnesium AZ92A-T6 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-T6 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-T6 alloy are listed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
275 MPa |
39900 psi |
|
Yield strength (@ strain 0.2%) |
150 MPa |
21800 psi |
|
Compressive yield strength (at 0.2% offset) |
150 MPa |
21800 psi |
|
Ultimate bearing strength |
550 MPa |
79800 psi |
|
Bearing yield strength |
450 MPa |
65300 psi |
|
Shear strength |
150 MPa |
21800 psi |
|
Fatigue strength (@# of cycles 1.00e+8) |
30 MPa |
4350 psi |
|
Shear modulus |
17 GPa |
2470 ksi |
|
Elastic modulus |
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) |
84 |
84 |
|
Knoop hardness (estimated from Brinell) |
108 |
108 |
|
Rockwell A hardness (estimated from Brinell) |
36 |
36 |
|
Rockwell B hardness (estimated from Brinell) |
52 |
52 |
|
Rockwell E hardness |
88 |
88 |
|
Vickers hardness (estimated from Brinell) |
95 |
95 |
|
Machinability (relative rating, 100=best) |
100 |
100 |
Thermal Properties
The following table outlines the thermal properties of magnesium AZ92A-T6 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-T6 alloy include:
-
SAE J465
-
AMS 4434
-
AMS 4453
-
AMS 4484
-
ASTM B 80
-
ASTM B 199
-
ASTM B 403
Fabrication and Heat Treatment
Magnesium AZ92A-T6 alloy is commonly welded using arc-welding and gas-shielded techniques. It is stress-relieved after welding. The material is then heat-treated at 410°C (765°F) for 16 to 24 h. The castings are then cooled to room temperature. This process is followed by aging at 218°C (425°F) for 5 h.
Applications
Magnesium AZ92A-T6 alloy is usually used in sand casting and permanent mold casting.