Microstructure and mechanical properties of a large billet of spray formed Al–Zn–Mg–Cu alloy with high Zn content

Experimental examination of strain field within GP zone in an Al–Zn–Mg–Cu alloy

“…Al-Zn-Mg-Cu series (7000) alloys with high strength, low density and good workability are extensively used in the aerospace and automobile industries [10][11][12][13], and, it is well known that the high strength of 7000 series alloys is in most cases associated with the strain field of the GP zone with fine scale. In this paper, the strain field of the GP zone in a spray formed Al-Zn-Mg-Cu alloy with high Zn content was explored quantitatively by combination of the HRTEM and the GPA technique.…”

A microstructure-based model for describing strain softening during compression of Al-30%wt Zn alloy

“…On one hand, when Zn particles move to grain boundaries, the movement of most of the dislocations is facilitated leading to enhanced recovery. On the other hand, when L increases the Orowan strengthening is strongly attenuated according to the right term of eqn (6). The TEM analysis has shown that uniaxial compression produces a strong grain refinement of Zn grains.…”

“…Under these circumstances a new term should be added to Eqn. (1) accounting for the Orowan mechanism which in turn should be dependent on both the distance between Zn particles (ω) and the size of Zn particles (d) (6) where (7) With increasing strain several concomitant phenomena should be considered: the size of Al grains decrease from 15 to 4 micron and the Zn particles in the bulk of Al grains increase in size and move to grain boundaries ( Figure 6). Therefore, after a certain amount of plastic deformation, it appears necessary to use both the dislocation density and a size parameter, the mean free path of dislocations, to model the mechanical behavior.…”

Characterization of spray formed Al-alloys — A Review

“…Pucun et al [36] investigated about the microstructure of a large billet of Al-Zn-Mg-Cu alloy which was prepared by spray deposition technique and further it was processed by hot extrusion, solid solution treatment and aging. It was observed that the microstructure of the alloy consists of dispersed and fine L1-Al 3 Zr phases, GP II Zones andή precipitates.…”