ZL5 is a pressure die casting zinc base alloy which conforms to BS EN 1774.
Application Pressure Diecasting
ZL5 is generally used for castings that require moderately higher strength and hardness and where dimensional stability is not an important criterion in the product application. ZL 5 is often specified for automotive applications in Europe. The alloy contains Copper as specified alloying element, this promotes marginally better casting properties than the ZL3 alloy and improves mechanical properties. The nominal 1% makes the alloy more expensive and therefore its use should be restricted to applications requiring its higher properties. ZL 5 will accept any finish specified for ZL 3.
When designing a stressed component using ZL5 further reference should be made to the alloys properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.
| Alloy Designation | ZnAL4Cu1 | Colour code | White + Black |
| Short designation | ZL 5 | Alloy Number. | ZL0410 |
MECHANICAL PROPERTIES
| Supplied in diecast form. | As Cast | Aged |
| Tensile strength | 328 MPa | 269 MPa |
| Yield strength | 221 MPa | – |
| Impa ct strength | 65 Joules | 54 Joules |
| Elongation 50mm | 7% | 13% |
| Shear strength | 262 MPa | – |
| Compressive yield strength | 599.8 MPa | – |
| Fatigue Strength | 56 MPa | – |
| Hardness BHN 500Kg | 91 max | 80 max |
PHYSICAL PROPERTIES
| Melting range | 380 - 386 deg C |
| Density | 6.7 g / cm 3 |
| Coefficient of Thermal expansion | 27.4 um/m deg C |
| Thermal Conductivity | 109 W/m deg C |
| Electrical Conductivity | 26 % IACS |
| Electrical Resistivity | 6.5359 u ohm-cm at 20 deg C |
