Aluminum 7050-T7451 vs. Solder SAC305

Compare Aluminum 7050-T7451 vs. Solder SAC305 strength, stiffness, weight and thermal properties.

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Mechanical
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Yield strength	469MPasourcetypical, longitudinal, 0.2% offset	22MPasourcetypical
Ultimate tensile strength	524MPasourcetypical, longitudinal	39.6MPasourcetypical
Elongation at break	11%sourcetypical, longitudinal	49%sourcetypical
Young's modulus (stiffness)	70.3GPasourcetypical	6.9GPasourcetypical, temperature and strain rate not stated
Density	2,830kg/m³sourcenominal	7,350kg/m³sourcetypical
Strength to weight	166kN·m/kg55.4x higher	2.99kN·m/kg
Stiffness to weight	24.8MN·m/kg26.5x higher	0.939MN·m/kg
Poisson's ratio	0.33sourcetypical (handbook physical constant)	0.35sourcetypical
Shear modulus	26.4GPa10.3x stiffer in shear	2.56GPa
Bulk modulus	68.9GPa	7.67GPa
Speed of sound	4,984m/s	969m/s
Thermal
Thermal conductivity	157W/m·Ksourcetypical, 20 °C	61W/m·Ksourcetypical, temperature not stated
Thermal expansion	23.5µm/m·Ksourcetypical, mean 20-100 °C	21.9µm/m·Ksourcemean, 20-100 °C (MacDermid Alpha)
100 mm part over a 50 °C swing	118µm growth	110µm growth7% less
Specific heat	860J/kg·Ksourcetypical, at 100 °C	232J/kg·Ksourcetypical (MacDermid Alpha)
Heats up and cools (diffusivity)	64.5mm²/s1.8x faster	35.8mm²/s
Thermal shock resistance	29,862W/m5.17x more resistant	5,773W/m
Melting point	524–635°Csourcemelting range	217–220°Csourcesolidus-liquidus
Values for	7050-T7451 plate, Kaiser Aluminum sheet, coil & plate typical datasheet (longitudinal); Poisson from MIL-HDBK-5J	SAC305 (Sn96.5Ag3.0Cu0.5) solder alloy, bulk; Indium Corporation Indalloy 256 (SAC305) for Preforms product data sheet (Form No. 100346 R0, 2024), selected properties, test temperature not stated; expansion and specific heat from MacDermid Alpha VACULOY SAC TDS (06 September 2023).

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 7050-T7451 stronger than Solder SAC305?

Aluminum 7050-T7451 is stronger: its yield strength is 469 MPa against 22 MPa for Solder SAC305 (21.3x).

Which is lighter, Aluminum 7050-T7451 or Solder SAC305?

Aluminum 7050-T7451 is lighter: 2,830 kg/m³ against 7,350 kg/m³ for Solder SAC305.

Which is stiffer, Aluminum 7050-T7451 or Solder SAC305?

Aluminum 7050-T7451 is stiffer: Young's modulus 70.3 GPa against 6.9 GPa for Solder SAC305, so the same part in Aluminum 7050-T7451 deflects less under the same load.

Which is lighter for the same job, Aluminum 7050-T7451 or Solder SAC305?

For the same stiffness or strength: Aluminum 7050-T7451 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.

Part that must be	Aluminum 7050-T7451	Solder SAC305
Stiff rod or tie (tension)	lighter	26.5x heavier
Stiff beam (bending)	lighter	8.29x heavier
Stiff panel or plate	lighter	5.63x heavier
Strong rod or tie	lighter	55.4x heavier
Strong beam	lighter	20x heavier
Strong panel or plate	lighter	12x heavier

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 7050-T7451 or Solder SAC305?

Aluminum 7050-T7451 conducts heat better: 157 W/m·K against 61 W/m·K for Solder SAC305.

Which expands less with temperature?

Solder SAC305 expands less: 21.9 µm/m·K against 23.5 µm/m·K for Aluminum 7050-T7451.

Among 72 materials

Stiffness against density

Strength against density