Unusual fatigue behavior of friction-stir welded Al-Mg-Si alloy

Igor Vysotskiy, Sergey Malopheyev, Salaheddin Rahimi, Sergey Mironov, Rustam Kaibyshev

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this work, high-cycle fatigue behavior of friction-stir welded AA6061-T6 was studied. An emphasis has been made on the inter-relationship between microstructure, residual stress and fatigue resistance. The welds were produced under optimized conditions, including a combination of relatively high welding temperature and rapid cooling rate, and subsequently undergone a standard post-weld aging heat treatment. The optimized welds exhibited excellent fatigue performance that was comparable (or even superior) to that of the base material. This result was attributed to a considerable grain refinement in the stir zone, subtle material softening in the heat-affected zone as well as to significant residual stress generated during the optimized FSW.
Original languageEnglish
Pages (from-to)277-286
Number of pages10
JournalMaterials Science and Engineering: A
Volume760
Issue number7
Early online date4 Jun 2019
DOIs
Publication statusPublished - 8 Jul 2019

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Keywords

  • heat treatable aluminum alloys
  • friction-stir welding
  • fatigue
  • microstructure
  • residual stress

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