Effect of multi pass friction stir processing on surface modification and properties of aluminum alloy 6061

Hardik Vyas, Kush P. Mehta*

*Corresponding author for this work

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

5 Citations (Scopus)


In the present investigation, friction stir processing (FSP) is carried out with multi pass processing having 100 % overlap zone on the workpiece material of aluminum alloy 6061. The experiments were conducted with constant FSP parameters and varying multi pass processing conditions. Novel processing concept of multi pass FSP was performed with different rotation directions (such as clock wise and anti-clock wise directions) and processing directions (such as forward, reverse and revert directions). Surface inspection, macrographs and microstructures of the processed regions are evaluated and compared with each other. Differences in microstructures were observed in the processed zone after multi-pass FSP compare to base materials. Multi-pass FSP with 100 % overlapping of two passes caused intense dynamic recrystallization and resulted in reduced grain size compare to AA6061 base material and other processing conditions. Hardness of processed zone was found increased in case two pass FSP relative to other processing conditions of single pass FSP and double sided FSP. Minimum tensile strength was reported with double sided FSP compare to single pass and two pass FSPs. No major variations in tensile strength were reported in case of single pass and two pass FSPs.

Original languageEnglish
Title of host publicationSurface Modification Technologies
EditorsPierpaolo Carlone, Antonello Astarita, Antonino Squillace, T.S. Sudarshan
Number of pages7
ISBN (Print)9783035715255
Publication statusPublished - 1 Jan 2019
MoE publication typeA4 Article in a conference publication
EventSurface Modification Technologies Conference - Naples, Italy
Duration: 26 Jun 201928 Jun 2019
Conference number: 33

Publication series

NameKey Engineering Materials
Volume813 KEM
ISSN (Print)1013-9826


ConferenceSurface Modification Technologies Conference
Abbreviated titleSMT


  • Friction stir processing
  • Microstructure
  • Multi-pass
  • Surface modification


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