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M A Z A K  2 7

Z n A l 2 7 C u 2

A high strength alloy which can be successfully cast by a variety of methods but best suited to sand casting and cold chamber pressure diecasting. Apart from the very high tensile strength and yield the alloy possesses good hardness, bearign properties and machinability. It can be heat treated if required to raise the ductility.

The combination of high strength with the ability to be pressure diecast with long die life means that many parts conventionally made by more expensive methods can now be produced from ZA27.

Mechanical Properties As-cast Aged Sand Heat treated
Tensile Strength (MPa) 426 360 400 - 441 310 - 325
Yield Strength (MPa) 371 317 372 255
Shear Strength (MPa) 325 257 290 228
Elongation (% in 51mm) 2 - 3 2 - 3 3 - 6 8 - 11
Hardness (Brinell-500Kg) 116 - 122 100 110 - 120 90 - 100
Impact Strength (Energy, Joules) 5 2.2 47 58
Fatigue Strength 5 x 108 cycles (MPa) 145 172 103


Physical properties  
Density 5,000 Kg/m3 at 21°C
Solidification shrinkage 1.25%
Casting shrinkage 0.75% (pressure diecast)
Freezing range 376 - 484°C
Casting temperature 550 - 580°C
Specific heat capacity 534.4 J/Kg/°C at 20 - 100°C
Thermal expansion 26.2 x 10-6 linear per °C at 20 - 100°C
Thermal conductivity 125.5 W/m/hr/m2/°C at 70 - 140°C
Electrical conductivity 29.7% IACS
Electrical resistance 5.8 u ohm cm at 20°C


TYPICAL ANALYSIS

Alloying elements  
Aluminum 27%
Copper 2.2%
Magnesium 0.017%
 
Impurities  
Iron < 0.07%
Lead < 0.003%
Cadmium < 0.003%
Tin < 0.001%
Nickel < 0.005%
Thallium < 0.001%
Indium < 0.0005%
Manganese < 0.01%