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7178 Aluminum vs. M1A Magnesium

7178 aluminum belongs to the aluminum alloys classification, while M1A magnesium belongs to the magnesium alloys.

For each property being compared, the top bar is 7178 aluminum and the bottom bar is M1A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
45
Elongation at Break, % 4.5 to 12
5.5
Fatigue Strength, MPa 120 to 210
88
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
18
Shear Strength, MPa 140 to 380
120
Tensile Strength: Ultimate (UTS), MPa 240 to 640
230
Tensile Strength: Yield (Proof), MPa 120 to 560
130

Thermal Properties

Latent Heat of Fusion, J/g 370
350
Maximum Temperature: Mechanical, °C 180
95
Melting Completion (Liquidus), °C 630
610
Melting Onset (Solidus), °C 480
580
Specific Heat Capacity, J/kg-K 860
990
Thermal Conductivity, W/m-K 130
150
Thermal Expansion, µm/m-K 23
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
35
Electrical Conductivity: Equal Weight (Specific), % IACS 91
190

Otherwise Unclassified Properties

Base Metal Price, % relative 10
12
Density, g/cm3 3.1
1.7
Embodied Carbon, kg CO2/kg material 8.2
24
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 1110
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
11
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
180
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 45
71
Strength to Weight: Axial, points 21 to 58
38
Strength to Weight: Bending, points 28 to 54
49
Thermal Diffusivity, mm2/s 47
88
Thermal Shock Resistance, points 10 to 28
13

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Calcium (Ca), % 0
0 to 0.3
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
0 to 0.050
Iron (Fe), % 0 to 0.5
0
Magnesium (Mg), % 2.4 to 3.1
97.2 to 98.8
Manganese (Mn), % 0 to 0.3
1.2 to 2.0
Nickel (Ni), % 0
0 to 0.010
Silicon (Si), % 0 to 0.4
0 to 0.1
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0
0 to 0.3