The effect of ingot processing treatments on the grain size and properties of Al alloy 7075

Texture analysis of the transition from slip to grain boundary sliding in a discontinuously recrystallized superplastic aluminum alloy

“…While details of the TMP are proprietary, the processing is similar to that initially developed for the 7475 aluminum alloy [10,11]. During rolling, deformation zones form around the Al 6 Mn particles and PSN may then take place.…”

“…These precipitate particles are intended to become sites for particle-stimulated nucleation (PSN) of recrystallization. This involves the formation of high-angle boundaries within the deformation zones around the particles and subsequent high-angle boundary migration into surrounding material [10][11][12][13][14]. Resulting recrystallization textures tend to be random, reflecting random grain orientations due to PSN [14], and there is a predominance of random, high-angle boundaries in the microstructure.…”

New Process Produces Superplastic Aerospace/Automotive Aluminum Alloy

“…Waldman [16] and Paton and Hamilton [17] patented general approaches for the grain refinement of aluminum alloys through TMP. The procedure included solution heat treatment, overaging, large subsequent rolling reductions, and static recrystallization.…”

“…Cold work can be used prior to the overaging step to improve the distribution of the precipitates by providing a uniform network of dislocations on which they can nucleate. [13] Although a general approach for the grain refinement of precipitation-hardening aluminum alloys existed prior to the current investigation, [16,17] it has not been applied as successfully to the 6XXX aluminum alloys as to, for instance, the 7XXX alloys. Waldman [16] successfully applied this process to aluminum alloy 7075, as did Paton and Hamilton.…”

“…[13] Although a general approach for the grain refinement of precipitation-hardening aluminum alloys existed prior to the current investigation, [16,17] it has not been applied as successfully to the 6XXX aluminum alloys as to, for instance, the 7XXX alloys. Waldman [16] successfully applied this process to aluminum alloy 7075, as did Paton and Hamilton. [17] The refined 7075 was then shown to exhibit superplasticity.…”