Materials / Compare
Aluminum 7075-T6 vs. Magnesium AZ31B-H24
Compare Aluminum 7075-T6 vs. Magnesium AZ31B-H24 strength, stiffness, weight and thermal properties.
| Try it on a partA bracket to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 503MPasourcetypical, 0.2% offset, .500 in dia specimen | 220MPasourcetypical, H24, 0.5-6 mm, 0.2 % proof stress |
| Ultimate tensile strength | 572MPasourcetypical | 290MPasourcetypical, H24, 0.5-6 mm |
| Elongation at break | 11%sourcetypical, in 4D | 13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A |
| Young's modulus (stiffness) | 71GPasourcetypical | 44.8GPasourcetypical (handbook physical constant) |
| Density | 2,800kg/m³sourcenominal | 1,769kg/m³sourcenominal1.58x lighter |
| Strength to weight | 180kN·m/kg44% higher | 124kN·m/kg |
| Stiffness to weight | 25.4MN·m/kg | 25.3MN·m/kg |
| Poisson's ratio | 0.33sourcetypical (handbook physical constant) | 0.35sourcetypical (handbook physical constant) |
| Shear modulus | 26.7GPa1.61x stiffer in shear | 16.6GPa |
| Bulk modulus | 69.6GPa | 49.8GPa |
| Speed of sound | 5,036m/s | 5,032m/s |
| Thermal | ||
| Thermal conductivity | 130W/m·Ksourcetypical, 20 °C, T651 | 76.9W/m·Ksourcetypical (temper/temperature not stated) |
| Thermal expansion | 23.4µm/m·Ksourcetypical, mean 20-100 °C | 26.8µm/m·Ksourcetypical (temperature range not stated) |
| 100 mm part over a 50 °C swing | 117µm growth15% less | 134µm growth |
| Specific heat | 960J/kg·Ksourcetypical, at 100 °C | 1,040J/kg·Ksourcetypical |
| Heats up and cools (diffusivity) | 48.4mm²/s16% faster | 41.8mm²/s |
| Thermal shock resistance | 26,370W/m2.88x more resistant | 9,159W/m |
| Melting point | 532–635°Csourcemelting range | not sourced |
| Max service temperature | not sourced | 149°Csourcestated application limit |
| Values for | 7075-T6/T651, Kaiser Aluminum rod & bar (mechanical) and sheet/coil/plate (physical) typical datasheets; Poisson from MIL-HDBK-5J | AZ31B-H24 sheet 0.016-0.062 in., MIL-HDBK-5J Table 4.2.1.0(b) (AMS 4377); strengths are S-basis MINIMUMS |
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 7075-T6 stronger than Magnesium AZ31B-H24?
Aluminum 7075-T6 is stronger: its yield strength is 503 MPa against 220 MPa for Magnesium AZ31B-H24 (2.29x).
Which is lighter, Aluminum 7075-T6 or Magnesium AZ31B-H24?
Magnesium AZ31B-H24 is lighter: 1,769 kg/m³ against 2,800 kg/m³ for Aluminum 7075-T6.
Which is stiffer, Aluminum 7075-T6 or Magnesium AZ31B-H24?
Aluminum 7075-T6 is stiffer: Young's modulus 71 GPa against 44.8 GPa for Magnesium AZ31B-H24, so the same part in Aluminum 7075-T6 deflects less under the same load.
Which is lighter for the same job, Aluminum 7075-T6 or Magnesium AZ31B-H24?
For the same stiffness or strength: Aluminum 7075-T6 is lighter for a strong rod or tie, strong beam; Magnesium AZ31B-H24 is lighter for a stiff beam (bending), stiff panel or plate, strong panel or plate.
| Part that must be | Aluminum 7075-T6 | Magnesium AZ31B-H24 |
|---|---|---|
| Stiff rod or tie (tension) | about equal | about equal |
| Stiff beam (bending) | 26% heavier | lighter |
| Stiff panel or plate | 36% heavier | lighter |
| Strong rod or tie | lighter | 44% heavier |
| Strong beam | lighter | 10% heavier |
| Strong panel or plate | 5% 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, Aluminum 7075-T6 or Magnesium AZ31B-H24?
Aluminum 7075-T6 conducts heat better: 130 W/m·K against 76.9 W/m·K for Magnesium AZ31B-H24.
Which expands less with temperature?
Aluminum 7075-T6 expands less: 23.4 µm/m·K against 26.8 µm/m·K for Magnesium AZ31B-H24.