Jul 16 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Applications
Introduction
Magnesium alloys harden rapidly with any type of cold work, and have good resistance to corrosion. Magnesium AZ92A-T4 alloy has good ductility and toughness, and it can be cast, formed, and forged.
The following datasheet gives an overview of magnesium AZ92A-T4 alloy.
Chemical Composition
The following table shows the chemical composition of magnesium AZ92A-T4 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-T4 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-T4 alloy are listed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
275 MPa |
39900 psi |
|
Yield strength (@ strain 0.200%) |
97 MPa |
14100 psi |
|
Compressive yield strength (at 0.2% offset) |
97 MPa |
14100 psi |
|
Ultimate bearing strength |
470 MPa |
68200 psi |
|
Bearing yield strength |
315 MPa |
45700 psi |
|
Shear strength |
140 MPa |
20300 psi |
|
Fatigue strength (@# of cycles 1.00e+8) |
40 MPa |
5800 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) |
10% |
10% |
|
Brinell hardness (500 kg load, 10 mm ball) |
63 |
63 |
|
Knoop hardness (estimated from Brinell) |
84 |
84 |
|
Rockwell E hardness |
75 |
75 |
|
Vickers hardness (estimated from Brinell) |
70 |
70 |
|
Machinability (relative rating, 100=best) |
100 |
100 |
Thermal Properties
The following table outlines the thermal properties of magnesium AZ92A-T4 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 |
44.3 W/mK |
307 BTU in/hr.ft².°F |
Other Designations
Other designations that are equivalent to magnesium AZ92A-T4 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-T4 alloy is a weldable casting alloy. It can be welded using gas-shielded and arc-welding methods. Stress relief is required after welding the alloy. The alloy is then heat-treated at 410°C (765°F) for 16 to 24 h.
Applications
Magnesium AZ92A-T4 alloy is typically used for commercial and military pressure-tight sand and permanent-mold castings that have high yield and tensile strengths.