Jul 30 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications
Introduction
Zamak 7 alloy is a high-purity alloy with lower magnesium content and slightly better ductility than zamak 3 alloys. The alloy is added with a small amount of nickel in order to reduce inter-granular corrosion and control impurities. The high ductility exhibited by this alloy also has an impact on processing, particularly in secondary operations for flash removal and trimming.
The alloy also exhibits excellent damping capacity and vibration when compared to aluminum die casting alloys.
The following datasheet will provide an overview of zamak 7 alloy.
Chemical Composition
The chemical composition of zamak 7 alloy is outlined in the following table.
|
Element |
Content (%) |
|
Aluminum, Al |
3.5-4.3 |
|
Copper, Cu |
0.25 |
|
Iron, Fe |
0.075 |
|
Nickel, Ni |
0.005-0.02 |
|
Magnesium, Mg |
0.005-0.02 |
|
Lead, Pbsss |
0.003 |
|
Cadmium, Cd |
0.002 |
|
Tin, Sn |
0.001 |
|
Zinc, Zn |
Remainder |
Physical Properties
The following table shows the physical properties of zamak 7 alloy.
|
Properties |
Metric |
Imperial |
|
Density |
6.6 g/cm3 |
0.24 lb/in3 |
|
Melting point |
381-387°C |
718-728°F |
Mechanical Properties
The mechanical properties of zamak 7 alloy are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
283 MPa |
441 psi |
|
Yield strength |
221 MPa |
32 psi |
|
Elongation at break |
13% |
13% |
|
Brinell hardness |
80 |
80 |
Thermal Properties
The thermal properties of zamak 7 alloy are given in the following table
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient |
27.4 µm/m°C |
15.2 µin/in°F |
|
Thermal conductivity |
113 W/mK |
784 BTU.in/hrft².°F |
Applications
Zamak 7 alloy is used in special cases where the die caster is employed for making thin walled components that requires a good surface finish.