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AZ91D Magnesium vs. ZA-8

AZ91D magnesium belongs to the magnesium alloys classification, while ZA-8 belongs to the zinc alloys. There are 32 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is AZ91D magnesium and the bottom bar is ZA-8.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 60 to 80
87 to 100
Compressive (Crushing) Strength, MPa 310 to 430
210 to 250
Elastic (Young's, Tensile) Modulus, GPa 46
85 to 86
Elongation at Break, % 2.3 to 4.5
1.3 to 8.0
Fatigue Strength, MPa 74 to 85
51 to 100
Poisson's Ratio 0.29
0.26
Shear Modulus, GPa 18
34
Shear Strength, MPa 120 to 140
240 to 280
Tensile Strength: Ultimate (UTS), MPa 160 to 220
210 to 370
Tensile Strength: Yield (Proof), MPa 80 to 130
210 to 290

Thermal Properties

Latent Heat of Fusion, J/g 350
110
Maximum Temperature: Mechanical, °C 130
100
Melting Completion (Liquidus), °C 600
400
Melting Onset (Solidus), °C 490
380
Specific Heat Capacity, J/kg-K 990
440
Thermal Conductivity, W/m-K 78
120
Thermal Expansion, µm/m-K 27
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
28
Electrical Conductivity: Equal Weight (Specific), % IACS 58
40

Otherwise Unclassified Properties

Base Metal Price, % relative 12
11
Density, g/cm3 1.7
6.3
Embodied Carbon, kg CO2/kg material 22
3.3
Embodied Energy, MJ/kg 160
62
Embodied Water, L/kg 990
420

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
2.8 to 28
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
260 to 490
Stiffness to Weight: Axial, points 15
7.5
Stiffness to Weight: Bending, points 69
23
Strength to Weight: Axial, points 26 to 34
9.3 to 17
Strength to Weight: Bending, points 38 to 46
12 to 18
Thermal Diffusivity, mm2/s 45
42
Thermal Shock Resistance, points 9.5 to 13
7.6 to 13

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
8.0 to 8.8
Cadmium (Cd), % 0
0 to 0.0060
Copper (Cu), % 0 to 0.030
0.8 to 1.3
Iron (Fe), % 0 to 0.0050
0 to 0.075
Lead (Pb), % 0
0 to 0.0060
Magnesium (Mg), % 88.7 to 91.2
0.015 to 0.030
Manganese (Mn), % 0.15 to 0.5
0
Nickel (Ni), % 0 to 0.0020
0 to 0.020
Silicon (Si), % 0 to 0.1
0 to 0.045
Tin (Sn), % 0
0 to 0.0030
Zinc (Zn), % 0.35 to 1.0
89.7 to 91.2