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AZ91B Magnesium vs. ZA-27

AZ91B magnesium belongs to the magnesium alloys classification, while ZA-27 belongs to the zinc alloys. There are 32 material properties with values for both materials. Properties with values for just one material (5, 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 AZ91B magnesium and the bottom bar is ZA-27.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
100 to 120
Compressive (Crushing) Strength, MPa 160
260 to 370
Elastic (Young's, Tensile) Modulus, GPa 46
78
Elongation at Break, % 5.0
2.0 to 4.5
Fatigue Strength, MPa 79
110 to 170
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 18
31
Shear Strength, MPa 140
230 to 330
Tensile Strength: Ultimate (UTS), MPa 240
400 to 430
Tensile Strength: Yield (Proof), MPa 160
260 to 370

Thermal Properties

Latent Heat of Fusion, J/g 360
130
Maximum Temperature: Mechanical, °C 130
120
Melting Completion (Liquidus), °C 600
480
Melting Onset (Solidus), °C 470
380
Specific Heat Capacity, J/kg-K 990
530
Thermal Conductivity, W/m-K 73
130
Thermal Expansion, µm/m-K 26
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
30
Electrical Conductivity: Equal Weight (Specific), % IACS 58
53

Otherwise Unclassified Properties

Base Metal Price, % relative 12
11
Density, g/cm3 1.7
5.0
Embodied Carbon, kg CO2/kg material 22
4.2
Embodied Energy, MJ/kg 160
80
Embodied Water, L/kg 990
570

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
8.1 to 18
Resilience: Unit (Modulus of Resilience), kJ/m3 280
420 to 890
Stiffness to Weight: Axial, points 15
8.6
Stiffness to Weight: Bending, points 69
28
Strength to Weight: Axial, points 38
22 to 24
Strength to Weight: Bending, points 49
24 to 25
Thermal Diffusivity, mm2/s 42
47
Thermal Shock Resistance, points 14
14 to 15

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
25 to 28
Cadmium (Cd), % 0
0 to 0.0060
Copper (Cu), % 0 to 0.35
2.0 to 2.5
Iron (Fe), % 0
0 to 0.1
Lead (Pb), % 0
0 to 0.0060
Magnesium (Mg), % 87.9 to 91.2
0.010 to 0.020
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 0.080
Tin (Sn), % 0
0 to 0.0030
Zinc (Zn), % 0.35 to 1.0
69.3 to 73