May 3 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Introduction
Magnesium is a silvery-white metal used as an alloy element for aluminum, lead, zinc and other nonferrous alloys. Magnesium QH21A-T6 alloy is pressure tight, and has good castability, high yield strength up to 250°C and good creep resistance.
The following datasheet gives an overview of magnesium QH21A-T6 alloy.
Chemical Composition
The following table shows the chemical composition of magnesium QH21A-T6 alloy.
|
Element |
Content (%) |
|
Magnesium, Mg |
95 |
|
Silver, Ag |
2-3 |
|
Neodymium, Nd |
0.60 - 1.5 |
|
Thorium, Th |
0.60 - 1.6 |
|
Zirconium, Zr |
0.40-1 |
|
Zinc, Zn |
≤0.20 |
|
Copper, Cu |
≤0.10 |
|
Nickel, Ni |
≤0.010 |
Physical Properties
The physical properties of magnesium QH21A-T6 alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
1.83 g/cm³ |
0.0661 lb/in³ |
|
Melting point |
535-640°C |
995-1180°F |
Mechanical Properties
The mechanical properties of cast magnesium QH21A-T6 alloy are listed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
275 MPa |
39900 psi |
|
Yield strength (@ strain 0.200%) |
2 MPa |
29700 psi |
|
Compressive yield strength |
210 MPa |
30500 psi |
|
Fatigue strength (@# of cycles 5.00e+7) |
105 MPa |
15200 psi |
|
Shear modulus |
17 GPa |
2470 ksi |
|
Elastic modulus |
45 GPa |
6530 ksi |
|
Poisson's ratio |
0.32 |
0.32 |
|
Elongation at break (in 50 mm) |
4% |
4% |
|
Machinability (relative rating, 100=best) |
100 |
100 |
Thermal Properties
The following table outlines the thermal properties of magnesium QH21A-T6 alloy.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@ 0.000-100°C/32-212°F) |
26.7 µm/m°C |
14.8 µin/in°F |
|
Thermal conductivity |
113 W/mK |
784 BTU in/hr.ft².°F |