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AZ81A Magnesium vs. ASTM B817 Type II

AZ81A magnesium belongs to the magnesium alloys classification, while ASTM B817 type II belongs to the titanium alloys. There are 25 material properties with values for both materials. Properties with values for just one material (9, 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 AZ81A magnesium and the bottom bar is ASTM B817 type II.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
100
Elongation at Break, % 3.0 to 8.8
3.0 to 13
Fatigue Strength, MPa 78 to 80
390 to 530
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 18
40
Tensile Strength: Ultimate (UTS), MPa 160 to 240
900 to 960
Tensile Strength: Yield (Proof), MPa 84
780 to 900

Thermal Properties

Latent Heat of Fusion, J/g 350
400
Maximum Temperature: Mechanical, °C 130
350
Melting Completion (Liquidus), °C 600
1580
Melting Onset (Solidus), °C 500
1530
Specific Heat Capacity, J/kg-K 990
550
Thermal Expansion, µm/m-K 27
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
37
Density, g/cm3 1.7
4.6
Embodied Carbon, kg CO2/kg material 23
40
Embodied Energy, MJ/kg 160
650
Embodied Water, L/kg 990
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
26 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
2890 to 3890
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 70
34
Strength to Weight: Axial, points 26 to 39
55 to 58
Strength to Weight: Bending, points 38 to 50
45 to 47
Thermal Shock Resistance, points 9.1 to 14
62 to 66

Alloy Composition

Aluminum (Al), % 7.0 to 8.1
5.0 to 6.0
Carbon (C), % 0
0 to 0.1
Chlorine (Cl), % 0
0 to 0.2
Copper (Cu), % 0 to 0.1
0.35 to 1.0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0
0.35 to 1.0
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0
Nickel (Ni), % 0 to 0.010
0
Nitrogen (N), % 0
0 to 0.040
Oxygen (O), % 0
0 to 0.3
Silicon (Si), % 0 to 0.3
0 to 0.1
Sodium (Na), % 0
0 to 0.2
Tin (Sn), % 0
1.5 to 2.5
Titanium (Ti), % 0
82.1 to 87.8
Vanadium (V), % 0
5.0 to 6.0
Zinc (Zn), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0 to 0.4