Strain rate insensitive plasticity in aluminum alloy 5083
- Nanyang Technological Univ., Singapore (Singapore). School of Mechanical and Production Engineering
Superplastic forming offers a cost effective means to produce stress free, complex shaped components in one operation with consistency and dimensional accuracy. With the emphasis for light weight structural materials increasing, several aluminum alloys, which include Supral 2004, 7475, 5083 and 8090 have been studied for their superplastic properties with the ultimate objective of using them in automotive and aerospace structures. Among these, non heat treatable 5083 because of its moderate strength, better corrosion resistance, weldability and ability to take surface finishes coupled with its low cost, is preferred for applications involving superplastic forming. Research into the various metallurgical aspects of AA 5083 has been pursued by several groups around the world. In general, development of superplastic alloys has been concerned with grain refinement through elemental additions, recrystallization and thermo-mechanical processing of existing alloys. While the primary role of Mg in 5083 AA is solid solution strengthening many modified Al-Mg alloys have been developed by addition of different elements like Cu, Mn, Zr, etc. in different proportions to AA 5083 with an aim to reduce the tendency of cavitation and improve overall superplastic properties. AA 5083 has been categorized as statically recrystallizing rather than dynamically recrystallizing prior to superplastic deformation that occurs during thermo-mechanical processing. All the studies done so far share one thing and that is the direct dependence of flow stress on the strain. This strain hardening which increases with strain rate is attributed to the grain coarsening that occurs during the deformation of the 5083 alloy. Also found in this alloy is the higher total elongation at lower strain rates. The purpose of this paper is to report and explain the unusual stress strain behavior and strain rate independent plasticity observed in 5083 aluminum alloy.
- OSTI ID:
- 619477
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 38; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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