Influence of friction stir processing tool design on microstructure and superplastic behavior of Al-Mg alloys

M. A. García-Bernal, R. S. Mishra, R. Verma, D. Hernández-Silva

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Friction stir processing is one of the most efficient techniques for microstructure refinement and has a potential for enhancing the deformation behavior of metallic materials at elevated temperature. The design of the tool has been shown to play a decisive role in microstructure modification. In this work, the effect of tool design on superplastic behavior of friction stir processed Al-Mg alloys has been investigated. The alloy was friction stir processed at 400 rpm and 0.42 m/s. Four different tools were used and compared. The pin was right-handed screw type in all cases. Very fine microstructures with grain sizes less than 3 µm were obtained with all the tools. Abnormal grain growth was observed after high temperature exposure using some of the tools. Maximum tensile elongations in the range of 575–810% were achieved with three of the tools. The tool with a larger shoulder area allowed more plastic deformation on the microstructure generating a more suitable microstructure for high temperature deformation.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalMaterials Science and Engineering A
Volume670
DOIs
StatePublished - 18 Jul 2016

Keywords

  • 5083
  • Al alloys
  • Friction stir processing
  • Superplasticity

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