Superplastic Behavior of AA7475 Aluminum Alloy

Cavitation behavior in superplastic 5083 Al alloy during multiaxial gas blow forming with lubrication

“…The effect of the stress state on cavitation has been studied both experimentally and theoretically [8,[11][12][13][14]. Zelin et al [8] explored the void distribution in formed double-well pans, while Chan and Chow [11] demonstrated the effect of the stress state on cavitation using biaxial tensile tests.…”

“…If this friction is large, and thinning is localized in the region where no contact has been made, it will result in a greater level of strain in the final forming areas. The strain, strain rate, and stress state can vary widely in different regions of the superplastically formed part [8][9][10], where this also causes variable cavitation levels from one location to another. The interfacial friction would be reduced by use of a lubricant since continued metal flow would be possible for the overlaid region after die contact.…”

Deformation characterization of superplastic AA7475 alloy

“…The AA7475 aluminium alloy has significant application in the aerospace industry for aircraft structures because of lightweight, high strength, good corrosion and fatigue resistance [1,2]. Those good properties along with the ability of forming difficult shape at low cost encourage investigator to study the superplastic behaviour of AA7475 alloy.…”

“…The contribution of grain boundary sliding to the total strain was determined by (2) There were also other investigations, which suggested crystallographic slip during superplastic deformation could cause grain rotation, which might not contribute to the total strain but could induce an extra degree of freedom, large extent spatial rearrangement of grains and variation in crystallographic orientations or texture [4][5][6]. The deformation processes, which could be responsible for textural and microstructural variation during the superplastic deformation are dislocation creep by crystallographic slip and grain boundary sliding.…”

Effect of Die Surface Roughness on Deformation Characteristics and Cavitation during Blow Forming in a Superplastic 5083 Alloy

“…The strain, strain rate, and stress state can vary widely in different regions of the formed part, [16][17][18] causing variable cavitation levels from one location to another. Provided that the interfacial friction is reduced by using a die with a smaller surface roughness, the thinning gradient would be reduced, since continued metal flow might be possible for the overlaid region after die contact.…”