Solder SAC305 vs. Titanium Ti-6Al-4V

Compare Solder SAC305 vs. Titanium Ti-6Al-4V strength, stiffness, weight and thermal properties.

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Mechanical
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Yield strength	22MPasourcetypical	885MPasourcetypical, plate (>0.187 in), annealed, 0.2% offset
Ultimate tensile strength	39.6MPasourcetypical	940MPasourcetypical, plate, annealed
Elongation at break	49%sourcetypical	16%sourcetypical, in 2 in., plate annealed
Young's modulus (stiffness)	6.9GPasourcetypical, temperature and strain rate not stated	107–122GPasourcetypical range, 20 °C
Density	7,350kg/m³sourcetypical	4,430kg/m³sourcenominal
Strength to weight	2.99kN·m/kg	200kN·m/kg66.7x higher
Stiffness to weight	0.939MN·m/kg	25.8MN·m/kg27.5x higher
Poisson's ratio	0.35sourcetypical	0.342sourcemean of TIMET measurements
Shear modulus	2.56GPa	42.7GPa16.7x stiffer in shear
Bulk modulus	7.67GPa	121GPa
Speed of sound	969m/s	5,084m/s
Thermal
Thermal conductivity	61W/m·Ksourcetypical, temperature not stated	6.6W/m·Ksourcetypical, 20 °C, mill annealed
Thermal expansion	21.9µm/m·Ksourcemean, 20-100 °C (MacDermid Alpha)	9µm/m·Ksourcetypical, mean 0-100 °C
100 mm part over a 50 °C swing	110µm growth	45µm growth2.43x less
Specific heat	232J/kg·Ksourcetypical (MacDermid Alpha)	580J/kg·Ksourcetypical, 20 °C
Heats up and cools (diffusivity)	35.8mm²/s13.9x faster	2.57mm²/s
Thermal shock resistance	5,773W/m1.55x more resistant	3,730W/m
Melting point	217–220°Csourcesolidus-liquidus	1,630–1,650°Csourcemelting range
Max service temperature	not sourced	400°Csourceupper recommended use temperature
Values for	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).	TIMETAL 6-4 (Ti-6Al-4V Grade 5) annealed plate typical (TIMET properties manual) + TIMET datasheet TMC-0150 physical properties

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 Solder SAC305 stronger than Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stronger: its yield strength is 885 MPa against 22 MPa for Solder SAC305 (40.2x).

Which is lighter, Solder SAC305 or Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is lighter: 4,430 kg/m³ against 7,350 kg/m³ for Solder SAC305.

Which is stiffer, Solder SAC305 or Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stiffer: Young's modulus 115 GPa against 6.9 GPa for Solder SAC305, so the same part in Titanium Ti-6Al-4V deflects less under the same load.

Which is lighter for the same job, Solder SAC305 or Titanium Ti-6Al-4V?

For the same stiffness or strength: Titanium Ti-6Al-4V 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	Solder SAC305	Titanium Ti-6Al-4V
Stiff rod or tie (tension)	27.5x heavier	lighter
Stiff beam (bending)	6.76x heavier	lighter
Stiff panel or plate	4.23x heavier	lighter
Strong rod or tie	66.7x heavier	lighter
Strong beam	19.5x heavier	lighter
Strong panel or plate	10.5x 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, Solder SAC305 or Titanium Ti-6Al-4V?

Solder SAC305 conducts heat better: 61 W/m·K against 6.6 W/m·K for Titanium Ti-6Al-4V.

Which expands less with temperature?

Titanium Ti-6Al-4V expands less: 9 µm/m·K against 21.9 µm/m·K for Solder SAC305.

Among 72 materials

Stiffness against density

Strength against density