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Technical Brief

Surface Layer Modification of 6061 Al Alloy by Friction Stir Processing and Second Phase Hard Particles for Improved Friction and Wear Performance

[+] Author and Article Information
M. Cinta Lorenzo-Martin

Argonne National Laboratory,
9700 S. Cass Avenue,
Lemont, IL 60439
e-mail: lorenzo-martin@anl.gov

Oyelayo O. Ajayi

Argonne National Laboratory,
9700 S. Cass Avenue,
Lemont, IL 60439,
e-mail: ajayi@anl.gov

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received February 10, 2014; final manuscript received June 13, 2014; published online July 9, 2014. Assoc. Editor: Dae-Eun Kim. The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States government purposes.

J. Tribol 136(4), 044501 (Jul 09, 2014) (6 pages) Paper No: TRIB-14-1040; doi: 10.1115/1.4027860 History: Received February 10, 2014; Revised June 13, 2014

This paper presents the results of the study on mechanical and tribological performance enhancement of 6061 aluminum alloys by incorporation of B4C particle via friction stir processing (FSP). The incorporation of B4C particles reduced friction by 30% and reduced wear by two orders of magnitude compared to unprocessed base material. FSP alone without particles addition did not have a significant effect on the tribological behavior of the aluminum alloy studied.

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Figures

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Fig. 1

Microstructure of Al alloy 6061, showing Al matrix and Mg rich second phase particles

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Fig. 2

Schematic of FSP for particle incorporation

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Fig. 3

B4C particles used for incorporation into Al 6061 surface layer

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Fig. 4

Microstructure of Al 6061 alloy: (a) original surface and (b) FSP surface without particles

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Fig. 5

(a) FSP material with B4C particles incorporated into surface layer and (b) matrix-particle interface

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Fig. 6

Variation of friction coefficient with time during sliding of 52100 steel on the base, and FSP without and with B4C particles Al alloys

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Fig. 7

Wear tracks for the base, and FSP without and with B4C Al alloy materials

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Fig. 8

Example of flat wear track analysis using profilometry

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Fig. 9

Wear volume for the flat base, and FSP without and with B4C Al alloy materials flat slid against steel ball after dry reciprocating sliding

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Fig. 10

Profilometry and 3D view of steel counterface after dry sliding against the base, and FSP without and with B4C Al alloy materials

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Fig. 11

Variation of wear volume with B4C particle volume fraction

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