Aluminum 1100-O vs. Magnesium AZ31B-H24

Compare Aluminum 1100-O vs. Magnesium AZ31B-H24 strength, stiffness, weight and thermal properties.

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Mechanical
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Yield strength	35MPasourcetypical, O, 0.0625 in specimen	220MPasourcetypical, H24, 0.5-6 mm, 0.2 % proof stress
Ultimate tensile strength	90MPasourcetypical, O	290MPasourcetypical, H24, 0.5-6 mm
Elongation at break	35%sourcetypical, O, in 4D	13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A
Young's modulus (stiffness)	69GPasourcetypical	44.8GPasourcetypical (handbook physical constant)
Density	2,710kg/m³sourcenominal, 20 °C	1,769kg/m³sourcenominal
Strength to weight	12.9kN·m/kg	124kN·m/kg9.63x higher
Stiffness to weight	25.5MN·m/kg	25.3MN·m/kg
Poisson's ratio	not sourced	0.35sourcetypical (handbook physical constant)
Shear modulus	not sourced	16.6GPa
Bulk modulus	not sourced	49.8GPa
Speed of sound	5,046m/s	5,032m/s
Thermal
Thermal conductivity	222W/m·Ksourcetypical, O, 20 °C	76.9W/m·Ksourcetypical (temper/temperature not stated)
Thermal expansion	23.6µm/m·Ksourcetypical, mean 20-100 °C	26.8µm/m·Ksourcetypical (temperature range not stated)
100 mm part over a 50 °C swing	118µm growth14% less	134µm growth
Specific heat	901J/kg·Ksourcebase material: commercially pure aluminium EN AW-1050A (Hydro), 20 °C	1,040J/kg·Ksourcetypical
Heats up and cools (diffusivity)	90.9mm²/s2.18x faster	41.8mm²/s
Thermal shock resistance	not sourced	9,159W/m
Melting point	640–655°Csourcemelting range	not sourced
Max service temperature	not sourced	149°Csourcestated application limit
Values for	1100-O (annealed) commercially pure aluminium, Kaiser Aluminum Tube & Pipe Alloy 1100 Technical Data (Rev. 05/06), typical properties; specific heat from Hydro EN AW-1050A (99.5% Al) extruded-products datasheet (10/2018).	AZ31B-H24 sheet 0.016-0.062 in., MIL-HDBK-5J Table 4.2.1.0(b) (AMS 4377); strengths are S-basis MINIMUMS

Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.

Questions

Is Aluminum 1100-O stronger than Magnesium AZ31B-H24?

Magnesium AZ31B-H24 is stronger: its yield strength is 220 MPa against 35 MPa for Aluminum 1100-O (6.29x).

Which is lighter, Aluminum 1100-O or Magnesium AZ31B-H24?

Magnesium AZ31B-H24 is lighter: 1,769 kg/m³ against 2,710 kg/m³ for Aluminum 1100-O.

Which is stiffer, Aluminum 1100-O or Magnesium AZ31B-H24?

Aluminum 1100-O is stiffer: Young's modulus 69 GPa against 44.8 GPa for Magnesium AZ31B-H24, so the same part in Aluminum 1100-O deflects less under the same load.

Which is lighter for the same job, Aluminum 1100-O or Magnesium AZ31B-H24?

For the same stiffness or strength: Magnesium AZ31B-H24 is lighter for a stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.

Part that must be	Aluminum 1100-O	Magnesium AZ31B-H24
Stiff rod or tie (tension)	about equal	about equal
Stiff beam (bending)	23% heavier	lighter
Stiff panel or plate	33% heavier	lighter
Strong rod or tie	9.63x heavier	lighter
Strong beam	5.22x heavier	lighter
Strong panel or plate	3.84x heavier	lighter

For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).

Which conducts heat better, Aluminum 1100-O or Magnesium AZ31B-H24?

Aluminum 1100-O conducts heat better: 222 W/m·K against 76.9 W/m·K for Magnesium AZ31B-H24.

Which expands less with temperature?

Aluminum 1100-O expands less: 23.6 µm/m·K against 26.8 µm/m·K for Magnesium AZ31B-H24.

Among 72 materials

Stiffness against density

Strength against density