Guinier–Preston zone
A Guinier–Preston zone, or GP-zone, is a fine-scale metallurgical phenomenon, involving early stage precipitation.[1][2]
GP-zones are associated with the phenomenon of age hardening, whereby room-temperature reactions continue to occur within a material through time, resulting in changing physical properties. In particular, this occurs in several aluminium series, such as the 6000 and 7000 series alloys.
Physically, GP zones are extremely fine-scaled (on the order of 3–10 nm in size) solute enriched regions of the material, which offer physical obstructions to the motion of dislocations, above that of the solid-solution strengthening of the solute components. In 7075 aluminium for example,[3] Zn–Mg clusters precede the formation of equilibrium MgZn2 precipitates.
References
Further reading
- G.D Preston, Structure of age-hardening aluminium–copper alloys, Nature 142 (1938) 570, September 24