ZL8 Zinc Alloy
Hot chamber pressure diecasting Zinc alloy.
ZL8 is a pressure die casting zinc base alloy which conforms to BS EN 1774 and is one of a family of versatile high grade zinc alloys manufactured by Brock Metal.
Application
ZL8 is designed to extend the application range of Zinc alloy diecastings. In the past Zinc alloys were considered unsuitable for applications where moderate stress was anticipated at elevated temperatures. ZL8 was specifically developed improve the creep resistance and offer the best creep resistance of all the pressure diecasting alloys. It should be specified for structural or stressed applications for which other Zinc alloys would be unsuitable.
Although it is the strongest of the hot chamber alloys, it still possesses all of the properties associated with Zinc diecasting alloys. The combination of higher strength, excellent dimensional stability, good surface finish and definition make it ideal for visible stressed parts which are subject to elevated temperatures during service. Finishes suitable for traditional pressure diecasting alloys can be applied to ZL 8 castings with the same excellent results.
Typical applications for this alloy are under bonnet automotive parts, stressed parts for hazardous or mining applications, stressed electrical or computer parts microwave guides etc.
When designing a stressed component using ZL8 further reference should be made to the alloys properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.
| Alloy Designation | ZnA18Cu1 | Colour code | White + blue. |
|---|---|---|---|
| Short designation | ZL 8 | Alloy Number. | ZL0810 |
| Chemical composition of Ingots. | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Al | Cu | Mg | Pb | Cd | Sn | Fe | Ni | Si | |
| Minimum | 8.2 | 0.9 | 0.02 | ||||||
| Maximum | 8.8 | 1.3 | 0.03 | 0.005 | 0.005 | 0.002 | 0.035 | 0.001 | 0.035 |
| MECHANICAL PROPERTIES | ||
|---|---|---|
| Supplied in diecast form. | As Cast | Aged |
| Tensile strength | 374 MPa | 297 MPa |
| Yield strength | 290 MPa | 225 MPa |
| Impact strength | 42 Joules | 17 joules |
| Elongation 50mm | 8% | 20% |
| Shear strength | 276 MPa | 227 MPa |
| Compressive yield strength | 252 MPa | 171 MPa |
| Fatigue Strength | 103 MPa | -- |
| Hardness BHN 500Kg | 106 max | 91 max |
| PHYSICAL PROPERTIES | |
|---|---|
| Melting range | 374 - 404° C |
| Density | 6.3 g / cm3 |
| Coefficient of Thermal expansion | 27.4 um/m0 C |
| Thermal Conductivity | 109 W/m0 C |
| Electrical Conductivity | 26 % IACS |
| Electrical Resistivity | 6.5359 u ohm-cm at 200 C |
