ELEKTRON AZ91D magnesium die-casting alloy, as cast; Magnesium Elektron datasheet 475 (7/01), typical properties; Poisson from MIL-HDBK-5J for AZ91C castings.
Sumitomo Chemical SUMIKASUPER LCP E6006L (30% glass fibre; high strength, low shrinkage); SUMIKASUPER LCP Technical Note, Version 04 / Nov. 2023, typical values.
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 AZ91D stronger than Plastic LCP GF30?
Magnesium AZ91D is stronger: its yield strength is 150 MPa against tensile strength 115 MPa for Plastic LCP GF30 (30%).
Which is lighter, Magnesium AZ91D or Plastic LCP GF30?
Plastic LCP GF30 is lighter: 1,610 kg/m³ against 1,810 kg/m³ for Magnesium AZ91D.
Which is stiffer, Magnesium AZ91D or Plastic LCP GF30?
Magnesium AZ91D is stiffer: Young's modulus 45 GPa against 11.5 GPa for Plastic LCP GF30, so the same part in Magnesium AZ91D deflects less under the same load.
Which is lighter for the same job, Magnesium AZ91D or Plastic LCP GF30?
For the same stiffness or strength: Magnesium AZ91D 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 AZ91D
Plastic LCP GF30
Stiff rod or tie (tension)
lighter
3.48x heavier
Stiff beam (bending)
lighter
1.76x heavier
Stiff panel or plate
lighter
40% heavier
Strong rod or tie
lighter
16% heavier
Strong beam
lighter
6% heavier
Strong panel or plate
lighter
2% 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 AZ91D or Plastic LCP GF30?
Magnesium AZ91D conducts heat better: 72 W/m·K against 0.5 W/m·K for Plastic LCP GF30.
Which expands less with temperature?
Plastic LCP GF30 expands less: 20 µm/m·K against 25 µm/m·K for Magnesium AZ91D.