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Research Papers: Friction and Wear

Effect of Mn Modification on the Tribological Properties of In Situ Al-15Mg2Si Composites Containing Fe as an Impurity

[+] Author and Article Information
A. Nadim

Department of Materials Science and Metallurgy,
Imam Khomeini International University (IKIU),
Qazvin 3414896818, Iran
e-mail: aida.nadim@gmail.com

R. Taghiabadi

Department of Materials Science and Metallurgy,
Imam Khomeini International University (IKIU),
Qazvin 3414896818, Iran
e-mail: taghiabadi@ikiu.ac.ir

A. Razaghian

Department of Materials Science and Metallurgy,
Imam Khomeini International University (IKIU),
Qazvin 3414896818, Iran
e-mail: razaghian@eng.ikiu.ac.ir

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 25, 2017; final manuscript received May 20, 2018; published online July 12, 2018. Assoc. Editor: Xiaolei Wang.

J. Tribol 140(6), 061610 (Jul 12, 2018) (9 pages) Paper No: TRIB-17-1497; doi: 10.1115/1.4040384 History: Received December 25, 2017; Revised May 20, 2018

The effect of Mn modification on the tribological properties of Al-15Mg2Si-(0.5-2)Fe composites was investigated. The sliding wear tests were conducted under the applied pressures of 0.25, 0.5, and 1.0 MPa at the constant sliding speed of 0.13 m/s. According to the results, the behavior of FeMn-rich intermetallics against the strains induced by sliding wear has an important role in the wear behavior of composites. In low-Fe composites (0.5–1 wt % Fe), Mn promotes the formation of Chinese script α-Al15(Fe,Mn)3Si2 phases instead of harmful β-Al5FeSi platelets. The formation of these compounds strengthens the substrate and decreases its microcracking tendency giving rise to a more stable tribolayer and improved wear properties. At the higher Fe contents, Mn modification leads to the formation of primary polyhedral or star-like α-Al15(Fe,Mn)3Si2 compounds in the microstructure and substantially neutralizes the harmful effect of the primary β-Fe crystals on the wear behavior. However, when subjected to the friction-induced surface plastic strains, the near-surface α-FeMn particles fracture and incorporate into the tribolayer making it unstable and less protective. The tribolayer stability in Mn-modified composites decreases the chance of adhesion between contacting surfaces, and, under low applied pressures, lowers the average friction coefficient (AFC) and its fluctuation. At higher applied pressures, however, the nonmodified composites exhibit lower AFC, which is probably due to the negative impact of β-Fe fragments on the tribolayer shear strength.

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Figures

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Fig. 1

(a) Microstructure of the base Al-15Mg2Si composite and (b) EDS spectrum of the primary Mg2Si particles

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Fig. 2

Microstructure of (a) 1Fe, (b) 2Fe, (c) 1FeMn, and (d) 2FeMn composites

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Fig. 3

The EDS microanalysis of (a) β-Fe particles, (b) α-Chinese scripts, and (c) α-star-likes

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Fig. 4

Effect of Fe content on the average size and the volume fraction of Mg2SiP particles

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Fig. 5

Variation of Al-15Mg2Si hardness against Fe content in non-modified and Mn-modified conditions

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Fig. 6

Variation of Al-15Mg2Si wear rate with Fe content at different applied pressures

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Fig. 7

SEM micrographs of the cross section of the (a) base, (b) 1Fe, and (c) 1FeMn composites after sliding under the applied pressure of 0.5 MPa

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Fig. 8

SEM micrographs of the cross section of the (a) base, (b) 1FeMn, (c) 2FeMn, and (d) 2Fe composites after sliding under applied pressure of 1 MPa

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Fig. 12

Variation of friction coefficient with sliding distance: (a) base, 1Fe, and 2Fe composites (0.5 MPa), (b) base, 1FeMn, and 2FeMn composites (0.5 MPa), (c) base, 1Fe, and 2Fe composites (1 MPa), and (d) base, 1FeMn, and 2FeMn composites (1 MPa)

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Fig. 11

Variation of AFC with Fe content for nonmodified and Mn-modified composites at the applied pressures of (a) 0.5 MPa and (b) 1 MPa

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Fig. 10

SEM micrographs showing wear debris of the (a) base and (b) 1FeMn composite, generated during sliding wear under the applied pressure of 1 MPa

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Fig. 9

SEM micrographs showing the worn surface morphology of the (a) base composite (0.5 MPa), (b) base composite (1 MPa), (c) 1FeMn composite (1 MPa), (d) 2FeMn composite (1 MPa), (e) 1Fe composite (1 MPa), and 2Fe composite (1 MPa)

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