FCC Al matrix
Face-centred cubicDuctile, no ductile-to-brittle transition like BCC steels.
What holds Aluminium together is not the nickname. Formula Al (+ Mg, Si, Cu, Zn…), density 2.70 g/cm³.
Meters are atlas-relative. Grades are the SKUs buyers write.
Phases
GP zones
Cu clusteringThe first hardening step in 2000-series ageing.
Mg2Si
6000-series precipitateThe extrusion family’s strength after T5/T6.
S / θ phases
Al2Cu, Al2CuMgOverageing coarsens them and drops strength.
Dispersoids
Mn, Cr, ZrControl grain structure during hot working.
Oxide film
Al2O3Nanometre passive film; the reason aluminium “does not rust” until chlorides pit it.
Jauges relatives
Strength62
Strength is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Heat envelope48
Heat envelope is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Fire behaviour70
Fire behaviour is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Insulation12
Insulation is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Workability90
Workability is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Circularity72
Circularity is an editorial 0–100 mark relative to the other 31 materials in this atlas — not a laboratory certificate.
Nuances
1050 / 1100
Commercially pureCommercially pure
3003 / 3004
Mn-bearingMn-bearing
5052 / 5083
Mg marineMg marine
6061 / 6063
Mg-Si extrusionMg-Si extrusion
7075
Zn-Mg-Cu aeroZn-Mg-Cu aero
Liaisons
Metallic FCC
Twelve slip systems: easy forming compared with HCP titanium or magnesium.
Precipitation
Coherent precipitates block dislocations after controlled ageing.
Passive oxide
Amphoteric film — acids and strong alkalis both attack it.
Galvanic couples
Aluminium is anodic to steel and copper; isolation washers exist for a reason.
Change the grade, the coating or the moisture and you have a different material with the same English name.
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