Magnesium AZ31B-H24 vs. Titanium Ti-6Al-4V

Compare Magnesium AZ31B-H24 vs. Titanium Ti-6Al-4V 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	885MPasourcetypical, plate (>0.187 in), annealed, 0.2% offset
Ultimate tensile strength	290MPasourcetypical, H24, 0.5-6 mm	940MPasourcetypical, plate, annealed
Elongation at break	13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A	16%sourcetypical, in 2 in., plate annealed
Young's modulus (stiffness)	44.8GPasourcetypical (handbook physical constant)	107–122GPasourcetypical range, 20 °C
Density	1,769kg/m³sourcenominal2.5x lighter	4,430kg/m³sourcenominal
Strength to weight	124kN·m/kg	200kN·m/kg1.61x higher
Stiffness to weight	25.3MN·m/kg	25.8MN·m/kg2% higher
Poisson's ratio	0.35sourcetypical (handbook physical constant)	0.342sourcemean of TIMET measurements
Shear modulus	16.6GPa	42.7GPa2.57x stiffer in shear
Bulk modulus	49.8GPa	121GPa
Speed of sound	5,032m/s	5,084m/s
Thermal
Thermal conductivity	76.9W/m·Ksourcetypical (temper/temperature not stated)	6.6W/m·Ksourcetypical, 20 °C, mill annealed
Thermal expansion	26.8µm/m·Ksourcetypical (temperature range not stated)	9µm/m·Ksourcetypical, mean 0-100 °C
100 mm part over a 50 °C swing	134µm growth	45µm growth2.98x less
Specific heat	1,040J/kg·Ksourcetypical	580J/kg·Ksourcetypical, 20 °C
Heats up and cools (diffusivity)	41.8mm²/s16.3x faster	2.57mm²/s
Thermal shock resistance	9,159W/m2.46x more resistant	3,730W/m
Melting point	not sourced	1,630–1,650°Csourcemelting range
Max service temperature	149°Csourcestated application limit	400°Csourceupper recommended use temperature
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	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 Magnesium AZ31B-H24 stronger than Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stronger: its yield strength is 885 MPa against 220 MPa for Magnesium AZ31B-H24 (4.02x).

Which is lighter, Magnesium AZ31B-H24 or Titanium Ti-6Al-4V?

Magnesium AZ31B-H24 is lighter: 1,769 kg/m³ against 4,430 kg/m³ for Titanium Ti-6Al-4V.

Which is stiffer, Magnesium AZ31B-H24 or Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stiffer: Young's modulus 115 GPa against 44.8 GPa for Magnesium AZ31B-H24, so the same part in Titanium Ti-6Al-4V deflects less under the same load.

Which is lighter for the same job, Magnesium AZ31B-H24 or Titanium Ti-6Al-4V?

For the same stiffness or strength: Magnesium AZ31B-H24 is lighter for a stiff beam (bending), stiff panel or plate, strong panel or plate; Titanium Ti-6Al-4V is lighter for a stiff rod or tie (tension), strong rod or tie.

Part that must be	Magnesium AZ31B-H24	Titanium Ti-6Al-4V
Stiff rod or tie (tension)	2% heavier	lighter
Stiff beam (bending)	lighter	1.57x heavier
Stiff panel or plate	lighter	1.83x heavier
Strong rod or tie	1.61x heavier	lighter
Strong beam	about equal	about equal
Strong panel or plate	lighter	25% 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 Titanium Ti-6Al-4V?

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

Among 59 materials

Stiffness against density

Strength against density