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5251 Aluminum vs. 7049 Aluminum

Both 5251 aluminum and 7049 aluminum are aluminum alloys. They have a moderately high 90% of their average alloy composition in common.

For each property being compared, the top bar is 5251 aluminum and the bottom bar is 7049 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 44 to 79
140
Elastic (Young's, Tensile) Modulus, GPa 68
70
Elongation at Break, % 2.0 to 19
6.2 to 7.0
Fatigue Strength, MPa 59 to 110
160 to 170
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
27
Shear Strength, MPa 110 to 160
300 to 310
Tensile Strength: Ultimate (UTS), MPa 180 to 280
510 to 530
Tensile Strength: Yield (Proof), MPa 67 to 250
420 to 450

Thermal Properties

Latent Heat of Fusion, J/g 400
370
Maximum Temperature: Mechanical, °C 180
180
Melting Completion (Liquidus), °C 650
640
Melting Onset (Solidus), °C 610
480
Specific Heat Capacity, J/kg-K 900
860
Thermal Conductivity, W/m-K 150
130
Thermal Expansion, µm/m-K 24
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
36
Electrical Conductivity: Equal Weight (Specific), % IACS 120
110

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
Density, g/cm3 2.7
3.1
Embodied Carbon, kg CO2/kg material 8.5
8.1
Embodied Energy, MJ/kg 150
140
Embodied Water, L/kg 1180
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.4 to 27
31 to 34
Resilience: Unit (Modulus of Resilience), kJ/m3 33 to 450
1270 to 1440
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
45
Strength to Weight: Axial, points 18 to 29
46 to 47
Strength to Weight: Bending, points 26 to 35
46 to 47
Thermal Diffusivity, mm2/s 61
51
Thermal Shock Resistance, points 7.9 to 13
22 to 23

Alloy Composition


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Aluminum (Al), % 95.5 to 98.2
85.7 to 89.5
Chromium (Cr), % 0 to 0.15
0.1 to 0.22
Copper (Cu), % 0 to 0.15
1.2 to 1.9
Iron (Fe), % 0 to 0.5
0 to 0.35
Magnesium (Mg), % 1.7 to 2.4
2.0 to 2.9
Manganese (Mn), % 0.1 to 0.5
0 to 0.2
Silicon (Si), % 0 to 0.4
0 to 0.25
Titanium (Ti), % 0 to 0.15
0 to 0.1
Zinc (Zn), % 0 to 0.15
7.2 to 8.2
Residuals, % 0 to 0.15
0 to 0.15