Influence of process on parameters on superplasticity of friction stir processed nugget in high strength Al-Cu-Li alloy

Moataz Attallah, H. G. Salem

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A parametric study was carried out to evaluate the influence of friction stir processing (FSP) parameters (tool rotation speed and feed rate) on the superplasticity of the weld nugget. Dynamically recrystallised AA 2095 thin sheets with a fine grain size of 2 μm were welded using four feed rates and three rotational speeds. High temperature tensile testing was employed to understand the significance of the FSP parameters and to optimise the parameters for maximum elongation. The tool rotation speed was found to be the most decisive parameter for controlling superplastic behaviour. A strain rate sensitivity of 0.68 was measured for the highest rotational speed at the optimum superplastic forming (SPF) temperature of 495°C. A maximum percentage 'elongation to failure' of 550% was achieved for the sheets subjected to FSP at 1000 rev min-1 and 4.2 mm s-1, compared with 475% obtained for the base metal at the optimum SPF temperature and strain rate of 495°C and 10-3 s-1, respectively.

Original languageEnglish
Pages (from-to)1370-1376
Number of pages7
JournalMaterials Science and Technology
Volume20
Issue number11
DOIs
Publication statusPublished - 1 Nov 2004

Keywords

  • Aluminium alloys
  • Friction stir processing
  • Superplasticity

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

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