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7049 Aluminum vs. Automotive Malleable Cast Iron

7049 aluminum belongs to the aluminum alloys classification, while automotive malleable cast iron belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, 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 7049 aluminum and the bottom bar is automotive malleable cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
130 to 290
Elastic (Young's, Tensile) Modulus, GPa 70
180
Elongation at Break, % 6.2 to 7.0
1.0 to 10
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
70
Tensile Strength: Ultimate (UTS), MPa 510 to 530
350 to 720
Tensile Strength: Yield (Proof), MPa 420 to 450
220 to 590

Thermal Properties

Latent Heat of Fusion, J/g 370
260
Melting Completion (Liquidus), °C 640
1410
Melting Onset (Solidus), °C 480
1370
Specific Heat Capacity, J/kg-K 860
480
Thermal Conductivity, W/m-K 130
41
Thermal Expansion, µm/m-K 23
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 110
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 10
1.9
Density, g/cm3 3.1
7.6
Embodied Carbon, kg CO2/kg material 8.1
1.5
Embodied Energy, MJ/kg 140
20
Embodied Water, L/kg 1110
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
6.8 to 30
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
130 to 950
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 46 to 47
13 to 26
Strength to Weight: Bending, points 46 to 47
14 to 24
Thermal Diffusivity, mm2/s 51
11
Thermal Shock Resistance, points 22 to 23
9.9 to 21

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Carbon (C), % 0
2.2 to 2.9
Chromium (Cr), % 0.1 to 0.22
0
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.35
93.6 to 96.7
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
0.15 to 1.3
Phosphorus (P), % 0
0.020 to 0.15
Silicon (Si), % 0 to 0.25
0.9 to 1.9
Sulfur (S), % 0
0.020 to 0.2
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 7.2 to 8.2
0
Residuals, % 0 to 0.15
0