Aluminum 1100-O vs. Aluminum 2024-T351

Compare Aluminum 1100-O vs. Aluminum 2024-T351 strength, stiffness, weight and thermal properties.

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Aluminum 2024-T351Wrought

Mechanical
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Yield strength	35MPasourcetypical, O, 0.0625 in specimen	324MPasourcetypical, 0.2% offset, .500 in dia specimen
Ultimate tensile strength	90MPasourcetypical, O	469MPasourcetypical
Elongation at break	35%sourcetypical, O, in 4D	19%sourcetypical, in 4D
Young's modulus (stiffness)	69GPasourcetypical	73.1GPasourcetypical
Density	2,710kg/m³sourcenominal, 20 °C	2,770kg/m³sourcenominal
Strength to weight	12.9kN·m/kg	117kN·m/kg9.06x higher
Stiffness to weight	25.5MN·m/kg	26.4MN·m/kg4% higher
Poisson's ratio	not sourced	0.33sourcetypical (handbook physical constant), all tempers
Shear modulus	not sourced	27.5GPa
Bulk modulus	not sourced	71.7GPa
Speed of sound	5,046m/s	5,137m/s
Thermal
Thermal conductivity	222W/m·Ksourcetypical, O, 20 °C	120W/m·Ksourcetypical, 20 °C
Thermal expansion	23.6µm/m·Ksourcetypical, mean 20-100 °C	22.9µm/m·Ksourcetypical, mean 20-100 °C
100 mm part over a 50 °C swing	118µm growth	115µm growth3% less
Specific heat	901J/kg·Ksourcebase material: commercially pure aluminium EN AW-1050A (Hydro), 20 °C	875J/kg·Ksourcetypical, at 100 °C
Heats up and cools (diffusivity)	90.9mm²/s1.84x faster	49.5mm²/s
Thermal shock resistance	not sourced	15,561W/m
Melting point	640–655°Csourcemelting range	502–638°Csourcemelting range
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).	2024-T4/T351, Kaiser Aluminum sheet, coil & plate typical datasheet; Poisson from MIL-HDBK-5J

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 Aluminum 2024-T351?

Aluminum 2024-T351 is stronger: its yield strength is 324 MPa against 35 MPa for Aluminum 1100-O (9.26x).

Which is lighter, Aluminum 1100-O or Aluminum 2024-T351?

Aluminum 1100-O is lighter: 2,710 kg/m³ against 2,770 kg/m³ for Aluminum 2024-T351.

Which is stiffer, Aluminum 1100-O or Aluminum 2024-T351?

Aluminum 2024-T351 is stiffer: Young's modulus 73.1 GPa against 69 GPa for Aluminum 1100-O, so the same part in Aluminum 2024-T351 deflects less under the same load.

Which is lighter for the same job, Aluminum 1100-O or Aluminum 2024-T351?

For the same stiffness or strength: Aluminum 2024-T351 is lighter for a stiff rod or tie (tension), strong rod or tie, strong beam, strong panel or plate.

Part that must be	Aluminum 1100-O	Aluminum 2024-T351
Stiff rod or tie (tension)	4% heavier	lighter
Stiff beam (bending)	about equal	about equal
Stiff panel or plate	about equal	about equal
Strong rod or tie	9.06x heavier	lighter
Strong beam	4.31x heavier	lighter
Strong panel or plate	2.98x 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 Aluminum 2024-T351?

Aluminum 1100-O conducts heat better: 222 W/m·K against 120 W/m·K for Aluminum 2024-T351.

Which expands less with temperature?

Aluminum 2024-T351 expands less: 22.9 µm/m·K against 23.6 µm/m·K for Aluminum 1100-O.

Among 72 materials

Stiffness against density

Strength against density