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ASTM B817 Type II vs. AZ81A Magnesium

ASTM B817 type II belongs to the titanium alloys classification, while AZ81A magnesium belongs to the magnesium 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 ASTM B817 type II and the bottom bar is AZ81A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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