Sand Cast Zinc-Aluminum 27
Sand cast ZA-27 is ZA-27 in the as-fabricated (no temper or treatment) condition. It has the highest ductility compared to the other variants of ZA-27. The graph bars on the material properties cards below compare sand cast ZA-27 to: zinc-aluminums (top), all zinc alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Brinell Hardness
110
Compressive (Crushing) Strength
330 MPa 48 x 103 psi
Elastic (Young's, Tensile) Modulus
78 GPa 11 x 106 psi
Elongation at Break
4.5 %
Fatigue Strength
170 MPa 25 x 103 psi
Fracture Toughness
24 MPa-m1/2 22 x 103 psi-in1/2
Knoop Hardness
140
Poisson's Ratio
0.27
Rockwell B Hardness
72
Shear Modulus
31 GPa 4.4 x 106 psi
Shear Strength
290 MPa 42 x 103 psi
Tensile Strength: Ultimate (UTS)
420 MPa 61 x 103 psi
Tensile Strength: Yield (Proof)
370 MPa 53 x 103 psi
Thermal Properties
Latent Heat of Fusion
130 J/g
Maximum Temperature: Mechanical
120 °C 260 °F
Melting Completion (Liquidus)
480 °C 900 °F
Melting Onset (Solidus)
380 °C 710 °F
Solidification (Pattern Maker's) Shrinkage
1.3 %
Specific Heat Capacity
530 J/kg-K 0.13 BTU/lb-°F
Thermal Conductivity
130 W/m-K 72 BTU/h-ft-°F
Thermal Expansion
26 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
30 % IACS
Electrical Conductivity: Equal Weight (Specific)
53 % IACS
Otherwise Unclassified Properties
Base Metal Price
11 % relative
Density
5.0 g/cm3 310 lb/ft3
Embodied Carbon
4.2 kg CO2/kg material
Embodied Energy
80 MJ/kg 34 x 103 BTU/lb
Embodied Water
570 L/kg 68 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
18 MJ/m3
Resilience: Unit (Modulus of Resilience)
870 kJ/m3
Stiffness to Weight: Axial
8.6 points
Stiffness to Weight: Bending
28 points
Strength to Weight: Axial
23 points
Strength to Weight: Bending
25 points
Thermal Diffusivity
47 mm2/s
Thermal Shock Resistance
15 points
Alloy Composition
| Zn | 69.3 to 73 | |
| Al | 25 to 28 | |
| Cu | 2.0 to 2.5 | |
| Fe | 0 to 0.1 | |
| Si | 0 to 0.080 | |
| Mg | 0.010 to 0.020 | |
| Ni | 0 to 0.020 | |
| Pb | 0 to 0.0060 | |
| Cd | 0 to 0.0060 | |
| Sn | 0 to 0.0030 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
EN 12844: Zinc and zinc alloys - Castings - Specifications
ASTM B86: Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloy Foundry and Die Castings
Corrosion Resistance of Zinc and Zinc Alloys, Frank C. Porter, 1994
Zinc Handbook: Properties, Processing, and Use In Design, Frank C. Porter, 1991
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015