Abstract
The effect of super plastic deformation on the microstructure of the low density Al–Li–Cu–Mg–Zr (8090) alloy has been investigated. Changes in grain structure, grain misorientation, and texture were observed with increasing superplastic deformation. These observations are consistent with strain enhanced grain growth accompanied by grain boundary sliding and rotation. The tensile and fatigue properties of superplastically formed (SPF) 8090 depend on superplastic strain, post-form heat treatment, and copper content. It is shown that, in the heat treated condition, the continuous loss in strength with superplastic strain can be attributed to grain growth and solute depletion at the surface. The changes in grain structure lead to increased surface roughness and a consequent reduction in fatigue life. In alloys of high copper content precipitation during age hardening is additionally dependent on the rate of cooling after SPF.MST/1286
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