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Research Papers: Friction and Wear

Wear Characteristics of Friction Stir Processed Magnesium RZ 5 Composites

[+] Author and Article Information
G. Vedabouriswaran

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
Delhi 110 016, India

S. Aravindan

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
Delhi 110 016, India
e-mail: aravindan@mech.iitd.ac.in

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 6, 2018; final manuscript received November 16, 2018; published online January 16, 2019. Assoc. Editor: Longqiu Li.

J. Tribol 141(4), 041601 (Jan 16, 2019) (10 pages) Paper No: TRIB-18-1223; doi: 10.1115/1.4042039 History: Received June 06, 2018; Revised November 16, 2018

Friction stir processing is performed on RZ 5 Mg alloy to produce surface metal matrix composites reinforced with hard reinforcement particles. Boron carbide, multiwalled carbon nanotubes, and a mixture of zirconia and alumina particle reinforcements were introduced. The developed surface composites (SCs) exhibited lower wear rates at various normal loads than the base RZ 5 Mg alloy owing to their improved microhardness. The wear resistance of the composites was 1.2–1.9 times greater than the base alloy, and hence, the wear rates were 18–50% lower than the base alloy. Maximum reduction in wear rate is observed in B4C-reinforced SC. Abrasion, adhesion, and oxidative wear mechanisms are operational during the wear test performed at loads ranging between 10 N and 75 N.

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Figures

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Fig. 1

(a) FSP setup, (b) schematic representation of specimen showing groove on its top surface, and (c) developed SMMC by FSP

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Fig. 2

(a) Pin-on-disk setup, (b) schematic representation of wear pin and its dimensions, and (c) zone of preparation of MMC wear samples

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Fig. 3

Microstructure of BM

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Fig. 4

Energy dispersive X-ray spectroscopy analysis of BM

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Fig. 5

XRD of BM and MMCs developed

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Fig. 6

(a) Microhardness of BM and MMCs and (b) variation of microhardness of the MMC with respect to the centerline distance of the surface MMC

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Fig. 7

Variation of COF of BM with respect to sliding distance

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Fig. 8

Variation of COF of MMC-A with respect to sliding distance

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Fig. 9

Variation of COF of MMC-B with respect to sliding distance

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Fig. 10

Variation of COF of MMC-C with respect to sliding distance

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Fig. 11

Variation of average COF of BM and MMCs

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Fig. 12

Mass loss per sliding distance of various specimens

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Fig. 13

Wear rate characteristics of the BM and the MMC

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Fig. 14

Wear resistances of the BM and the developed MMC

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Fig. 15

Specific wear rate characteristics of BM and MMC

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Fig. 16

Variation of COF and wear rate of various wear test specimen with respect to the applied load

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Fig. 17

EDX analysis of wear pin

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Fig. 19

(a) SEM images of wear debris and (b) and (c) higher magnification of wear debris

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Fig. 20

EDX analysis of the wear debris

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