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Young's Modulus of Aluminium Alloy 6061

EAl=6.89×1010 PaE_{\mathrm{Al}} = 6.89 \times 10^{10}\ \text{Pa}
Value68.9 GPa (6.89 × 10¹⁰ Pa)
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StatusTypical value: varies by about ± 1.5 GPa in practice
SourceNASA CR-123772, Materials Data Handbook: Aluminum Alloy 6061, 2nd ed. (1972), section 7.224: typical E = 10.0 × 10³ ksi (68.9 GPa); the design value in section 7.223 is 9.9 × 10³ ksi
CategoriesMaterial PropertiesEngineering & Trade
Young's Modulus of Aluminium Alloy 6061 in every pressure unit
UnitValue
gigapascal68.9 GPa
megapascal68,900 MPa
kip per square inch9,993.1001 ksi
million pounds per square inch9.9931001 Mpsi
21 more pressure units
microbar689,000,000,000 μbar
barye689,000,000,000 Ba
millitorr516,792,500,000 mTorr
pascal68,900,000,000 Pa
millimeter of water column7,025,844,700 mmH₂O
pound per square foot1,439,006,400 lb/ft²
centimeter of water column702,584,470 cmH₂O
hectopascal689,000,000 hPa
millibar689,000,000 mbar
torr516,792,500 Torr
millimeter of mercury516,792,430 mmHg
inch of water column276,608,060 in w.g.
kilopascal68,900,000 kPa
foot of water column23,050,672 ft H₂O
inch of mercury20,346,158 inHg
pound per square inch9,993,100.1 psi
meter of water column7,025,844.7 m H₂O
decibar6,890,000 dbar
kilogram-force per square centimeter702,584.47 kgf/cm²
bar689,000 bar
atmosphere679,990.13 atm

Learning zone

Ten thousand ksi is the number every aluminium designer carries, and like steel's 29 000 ksi it is essentially alloy-independent: 6061-T6, 6063-T5 and 5052-H32 all sit within a couple of percent of 69 GPa, and even 7075-T6, which is three times stronger than 6061-O, is only 71.7 GPa. Temper changes strength, not stiffness.

The ratio to steel, very nearly 1:3, drives the design of every aluminium structure. Substituting an aluminium section for an identical steel one triples the deflection and cuts the Euler buckling load to a third, while cutting the weight to about 35 %. That is why aluminium extrusions are deep and ribbed: geometry has to buy back the stiffness the material does not have. Aluminium also has no fatigue endurance limit, so cyclically loaded aluminium is designed to a finite life, and it loses strength fast above about 150 °C: near a weld, the heat-affected zone of 6061-T6 reverts toward annealed properties and is designed as such.

Used by 5 solvers

Axial Deformation (δ = PL/AE)

δ=PLAE\delta = \frac{P L}{A E}

Beam Deflection: Simply Supported, Uniform Load

δ=5wL4384EI\delta = \frac{5 w L^{4}}{384 E I}

Euler Critical Buckling Load

Pcr=π2EI(KL)2P_{cr} = \frac{\pi^{2} E I}{(K L)^{2}}

Thermal Stress in a Restrained Member

σ=EαΔT\sigma = E \alpha \Delta T

Young's Modulus (E = σ/ε)

E=σεE = \frac{\sigma}{\varepsilon}
Revised 8 November 2026
Cite this page

formula.expert. (2026, November 8). Young's Modulus of Aluminium Alloy 6061. https://formula.expert/constants/youngs-modulus-aluminium-6061