Jul 3 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Introduction
Magnesium alloys are light in weight and used for both cast and forged components.
The following datasheet gives an overview of magnesium HM21A-T5 alloy.
Chemical Composition
The following table shows the chemical composition of magnesium HM21A-T5 alloy.
|
Element |
Content (%) |
|
Magnesium, Mg |
97 |
|
Thorium, Th |
1.5-2.5 |
|
Manganese, Mn |
0.45 – 1.1 |
Physical Properties
The physical properties of magnesium HM21A-T5 alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
1.78 g/cm³ |
0.0643 lb/in³ |
Mechanical Properties
The mechanical properties of magnesium HM21A-T5 alloy are listed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
230 MPa |
33400 psi |
|
Yield strength |
150 MPa |
21800 psi |
|
Compressive yield strength |
110 MPa |
16000 psi |
|
Ultimate bearing strength |
250 MPa |
36300 psi |
|
Bearing yield strength |
160 MPa |
23200 psi |
|
Shear strength |
125 MPa |
18100 psi |
|
Fatigue strength |
83 MPa |
12000 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) |
9% |
9% |
|
Brinell hardness (500 kg load, 10 mm ball) |
50 |
50 |
|
Machinability (relative rating, 100=best) |
100 |
100 |
Thermal Properties
The following table outlines the thermal properties of magnesium HM21A-T5 alloy.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@ 0-100°C/32-212°F) |
26.8 µm/m°C |
14.9 µin/in°F |
|
Thermal conductivity |
135 W/mK |
937 BTU in/hr.ft².°F |
Other Designations
An equivalent material to magnesium HM21A-T5 alloy is AMS 4363.