JIS ADC12 (Al-Si-Cu, about A383 / EN AC-46100) high-pressure die-casting alloy, as cast; physical properties from Daiki Aluminium Industry (ADC12 ingot producer) measured values; modulus from S.S.Aluminum (ADC12 ingot producer) standard values.
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 ADC12 stronger than Solder SAC305?
Aluminum ADC12 is stronger: its yield strength is 149 MPa against 22 MPa for Solder SAC305 (6.77x).
Which is lighter, Aluminum ADC12 or Solder SAC305?
Aluminum ADC12 is lighter: 2,680 kg/m³ against 7,350 kg/m³ for Solder SAC305.
Which is stiffer, Aluminum ADC12 or Solder SAC305?
Aluminum ADC12 is stiffer: Young's modulus 79.8 GPa against 6.9 GPa for Solder SAC305, so the same part in Aluminum ADC12 deflects less under the same load.
Which is lighter for the same job, Aluminum ADC12 or Solder SAC305?
For the same stiffness or strength: Aluminum ADC12 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 ADC12
Solder SAC305
Stiff rod or tie (tension)
lighter
31.7x heavier
Stiff beam (bending)
lighter
9.33x heavier
Stiff panel or plate
lighter
6.2x heavier
Strong rod or tie
lighter
18.6x heavier
Strong beam
lighter
9.82x heavier
Strong panel or plate
lighter
7.14x 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 ADC12 or Solder SAC305?
Aluminum ADC12 conducts heat better: 125 W/m·K against 61 W/m·K for Solder SAC305.
Which expands less with temperature?
Aluminum ADC12 expands less: 21 µm/m·K against 21.9 µm/m·K for Solder SAC305.