Magnesium AZ31B-H24 vs. Solder SAC305

Compare Magnesium AZ31B-H24 vs. Solder SAC305 strength, stiffness, weight and thermal properties.

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Mechanical
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Yield strength	220MPasourcetypical, H24, 0.5-6 mm, 0.2 % proof stress	22MPasourcetypical
Ultimate tensile strength	290MPasourcetypical, H24, 0.5-6 mm	39.6MPasourcetypical
Elongation at break	13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A	49%sourcetypical
Young's modulus (stiffness)	44.8GPasourcetypical (handbook physical constant)	6.9GPasourcetypical, temperature and strain rate not stated
Density	1,769kg/m³sourcenominal	7,350kg/m³sourcetypical
Strength to weight	124kN·m/kg41.5x higher	2.99kN·m/kg
Stiffness to weight	25.3MN·m/kg27x higher	0.939MN·m/kg
Poisson's ratio	0.35sourcetypical (handbook physical constant)	0.35sourcetypical
Shear modulus	16.6GPa6.49x stiffer in shear	2.56GPa
Bulk modulus	49.8GPa	7.67GPa
Speed of sound	5,032m/s	969m/s
Thermal
Thermal conductivity	76.9W/m·Ksourcetypical (temper/temperature not stated)	61W/m·Ksourcetypical, temperature not stated
Thermal expansion	26.8µm/m·Ksourcetypical (temperature range not stated)	21.9µm/m·Ksourcemean, 20-100 °C (MacDermid Alpha)
100 mm part over a 50 °C swing	134µm growth	110µm growth22% less
Specific heat	1,040J/kg·Ksourcetypical	232J/kg·Ksourcetypical (MacDermid Alpha)
Heats up and cools (diffusivity)	41.8mm²/s17% faster	35.8mm²/s
Thermal shock resistance	9,159W/m1.59x more resistant	5,773W/m
Melting point	not sourced	217–220°Csourcesolidus-liquidus
Max service temperature	149°Csourcestated application limit	not sourced
Values for	AZ31B-H24 sheet 0.016-0.062 in., MIL-HDBK-5J Table 4.2.1.0(b) (AMS 4377); strengths are S-basis MINIMUMS	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 Magnesium AZ31B-H24 stronger than Solder SAC305?

Magnesium AZ31B-H24 is stronger: its yield strength is 220 MPa against 22 MPa for Solder SAC305 (10x).

Which is lighter, Magnesium AZ31B-H24 or Solder SAC305?

Magnesium AZ31B-H24 is lighter: 1,769 kg/m³ against 7,350 kg/m³ for Solder SAC305.

Which is stiffer, Magnesium AZ31B-H24 or Solder SAC305?

Magnesium AZ31B-H24 is stiffer: Young's modulus 44.8 GPa against 6.9 GPa for Solder SAC305, so the same part in Magnesium AZ31B-H24 deflects less under the same load.

Which is lighter for the same job, Magnesium AZ31B-H24 or Solder SAC305?

For the same stiffness or strength: Magnesium AZ31B-H24 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	Magnesium AZ31B-H24	Solder SAC305
Stiff rod or tie (tension)	lighter	27x heavier
Stiff beam (bending)	lighter	10.6x heavier
Stiff panel or plate	lighter	7.75x heavier
Strong rod or tie	lighter	41.5x heavier
Strong beam	lighter	19.3x heavier
Strong panel or plate	lighter	13.1x 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, Magnesium AZ31B-H24 or Solder SAC305?

Magnesium AZ31B-H24 conducts heat better: 76.9 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 26.8 µm/m·K for Magnesium AZ31B-H24.

Among 72 materials

Stiffness against density

Strength against density