Manufacturing aluminium sandwich structures by means of superplastic forming

P. Impiö*, J. Pimenoff, Hannu Hänninen, M. Heinäkari

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)

Abstract

This paper examines the possibilities of manufacturing large-scale aluminium sandwich structures using superplastic forming. The materials tested were Mg-alloyed production quality aluminium (Al 5083-O, Al 5083-H321) and Aluminium 1561. Tensile tests at elevated temperatures were performed in order to establish the suitability of the test materials for superplastic forming. The microstructural changes in the test material specimens were examined. Thereafter numerical simulation of the Al 5083-O forming process was conducted based on the tensile test results. The numerical simulation results were subsequently used to estimate forming parameters and the feasibility of manufacturing large-scale structures by superplastic forming. The results indicate that higher strain can be reached at higher temperatures for the test materials. Aluminium alloy 1561 exhibited the largest elongation to fracture and Al 5083-H321 the smallest. Strain appeared to be temperature dependent but not much affected by the strain rate. Metallographic examination clarified that Al-5083-O and Al-5083-H321 showed susceptibility for cavity forming whereas Aluminium 1561 formed relatively few voids. The numerical simulation indicated that Al 5083-O can be superplastically formed using relatively low forming pressure (0.9 - 1.4 bar).

Original languageEnglish
Title of host publicationSUPERPLASTICITY-CURRENT STATUS AND FUTURE POTENTIAL
PublisherMATERIALS RESEARCH SOCIETY
Pages223-228
Number of pages6
ISBN (Print)1-55899-509-9
DOIs
Publication statusPublished - 2000
MoE publication typeA4 Article in a conference publication
EventSymposium on Superplasticity-Current Status and Future Potential - Boston, United States
Duration: 29 Nov 19991 Dec 1999

Publication series

NameMATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS
Volume601
ISSN (Print)0272-9172

Conference

ConferenceSymposium on Superplasticity-Current Status and Future Potential
CountryUnited States
CityBoston
Period29/11/199901/12/1999
OtherHeld at the 1999 MRS Fall Meeting

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