Aug 5 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Introduction
Magnesium ZK21A-F alloys have been developed in an effort to obtain mechanical properties that are halfway between magnesium AZ31B and ZK60A alloys; good weldability in contrast to magnesium ZK60A alloy and freedom from stress relief requirements in contrast to magnesium AZ31B alloy.
They are designated using the ASTM and SAE system in which the first part indicates the two main alloying elements in the alloy and the second part represents their percentages.
The following datasheet gives an overview of magnesium ZK21A-F alloy.
Chemical Composition
The following table shows the chemical composition of magnesium ZK21A-F alloy.
|
Element |
Content (%) |
|
Magnesium, Mg |
97 |
|
Zinc. Zn |
2-2.6 |
|
Zirconium, Zr |
0.45-0.80 |
Physical Properties
The physical properties of magnesium ZK21A-F alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
1.80 g/cm³ |
0.0650 lb/in³ |
Mechanical Properties
The mechanical properties of extruded tubing magnesium ZK21A-F alloy are outlined in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
235 MPa |
34100 psi |
|
Yield strength (@strain 0.200 %) |
180 MPa |
26100 psi |
|
Elongation at break |
4% |
4% |
|
Poisson's ratio |
0.35 |
0.35 |
|
Elastic modulus |
44.8 GPa |
6497 ksi |
Thermal Properties
The thermal properties of magnesium ZK21A-F alloy are highlighted in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@0.000-100°C/32-212°F) |
26 µm/m°C |
14.4 µin/in°F |
|
Thermal conductivity |
110 W/mK |
763 BTU in/hr.ft².°F |
Other Designations
The other designation used to denote magnesium ZK21A-F alloy is AMS 4387.