Bambu Lab PAHT-CF, TDS V3.0, printed specimens X-Y, dry state; nozzle 290 °C, bed 100 °C, 100 mm/s, 100% infill; annealed and dried 80 °C for 12 h before testing.
ELEKTRON AZ91D magnesium die-casting alloy, as cast; Magnesium Elektron datasheet 475 (7/01), typical properties; Poisson from MIL-HDBK-5J for AZ91C castings.
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.
FDM PAHT-CF is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is FDM PAHT-CF stronger than Magnesium AZ91D?
Magnesium AZ91D is stronger: its yield strength is 150 MPa against tensile strength 92 MPa for FDM PAHT-CF (1.63x).
Which is lighter, FDM PAHT-CF or Magnesium AZ91D?
FDM PAHT-CF is lighter: 1,060 kg/m³ against 1,810 kg/m³ for Magnesium AZ91D.
Which is stiffer, FDM PAHT-CF or Magnesium AZ91D?
Magnesium AZ91D is stiffer: Young's modulus 45 GPa against 3.86 GPa for FDM PAHT-CF, so the same part in Magnesium AZ91D deflects less under the same load.
Which is lighter for the same job, FDM PAHT-CF or Magnesium AZ91D?
For the same stiffness or strength: FDM PAHT-CF is lighter for a strong rod or tie, strong beam, strong panel or plate; Magnesium AZ91D is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate.
Part that must be
FDM PAHT-CF
Magnesium AZ91D
Stiff rod or tie (tension)
6.83x heavier
lighter
Stiff beam (bending)
2x heavier
lighter
Stiff panel or plate
33% heavier
lighter
Strong rod or tie
lighter
5% heavier
Strong beam
lighter
23% heavier
Strong panel or plate
lighter
34% 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).