Effect of heat treatment on the microstructure and mechanical properties of the spray-deposited Al–10.8Zn–2.8Mg–1.9Cu alloy

Quantitative study of precipitates in an Al–Zn–Mg–Cu alloy aged with various typical tempers

“…The evolution for tensile strength of the alloy with the precipitate size suggests a predominant orowan bypassing mechanism for the over-aging states. The reduced degree of lattice coherency from η′ to η is another reason for the loss of mechanical strength [1][2][3]. However, compared with that of the T6 sample, the RRA treated sample has a larger precipitate size and smaller number density, but their mechanical strengths are comparable.…”

“…The strengthening effect mainly comes from the nanoscale precipitates formed during the aging process [1][2][3]. Different aging tempers have been developed for the 7000 series age-hardening aluminum alloys, such as T6, T7X and RRA (retrogression and reaging) treatments.…”

Quantitative study of nanoscale precipitates in Al–Zn–Mg–Cu alloys with different chemical compositions

“…And a lot of 7000 series aluminum alloys with different chemical compositions and performances have been developed. It is well known that the strengthening effect in Al-Zn-Mg-Cu alloys mainly comes from the nanoscale precipitates formed during the aging process [3][4][5]. Basically, the geometrical characteristics of the nanoscale precipitates (including the size, shape, interprecipitate distance, volume fraction, and number density) determine the mechanical strength of the alloy [6].…”

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

“…Al-Zn-Mg-Cu series (7000) alloys with high strength, low density and good workability are extensively used in the aerospace and automobile industries [1][2][3], and, it is well known that the high strength of 7000 series alloys is in most cases associated with fine scale precipitation of the metastable Zn-and Mg-rich phase and GP zones. And furthermore, for the most part, increasing the zinc content will result in an increased volume fraction of metastable precipitates and improve the strength of the alloys.…”

“…Especially, spray deposition technique has been used extensively to manufacture many structural materials. And it has been recognized generally that the spray forming process enables the level of Zn in Al-Zn-Mg-Cu alloys to be increased considerably and further improves the mechanical properties of the alloys by introducing more precipitate phase, and, many research results concerned have been reported [2][3][4][5][6][7][8][9][10].…”