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Research Papers: Friction and Wear

Influence of Applied Load on Abrasive Wear Depth of Hybrid Gr/SiC/Al–Mg–Si Composites in a Two-Body Condition

[+] Author and Article Information
N. Ch. Kaushik

Department of Mechanical Engineering,
National Institute of Technology,
Warangal 506004, India
e-mail: kaushiknch1234@gmail.com

R. N. Rao

Department of Mechanical Engineering,
National Institute of Technology,
Warangal 506004, India

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received November 9, 2016; final manuscript received January 4, 2017; published online May 26, 2017. Assoc. Editor: Dae-Eun Kim.

J. Tribol 139(6), 061601 (May 26, 2017) (9 pages) Paper No: TRIB-16-1351; doi: 10.1115/1.4035779 History: Received November 09, 2016; Revised January 04, 2017

The influence of load applied on wear depth of stir cast hybrid Gr/SiC/Al 6082 composites in a two-body abrasion was investigated in as cast (AC) and T6 heat-treated condition (T6). The obtained results were compared with its unreinforced alloy and SiC/Al 6082 composites. The parameters of the applied load (5–15 N), grit size (100 μm and 200 μm), and sliding distance of 75 m were used in this study. At 200-μm grit size, the wear depth of hybrid composites with respect to unreinforced matrix alloy was reduced by 38.1% (at 5 N load) and 16.2% (at 15 N load) in AC condition; 25.1% (at 5 N load), and 27% (at 15 N load) in T6 condition. The wear mechanisms were demonstrated through the analysis of wear surfaces.

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Figures

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Fig. 1

Input and output variables in the abrasive wear process

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Fig. 2

A schematic sketch stir casting setup

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Fig. 3

Microstructural images of (a) SiC/Al composite and (b) Gr/SiC/Al hybrid composite

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Fig. 4

A schematic diagram indicating pin on the disk in wear test

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Fig. 5

Specific wear rate versus load for alloy matrix and its composites

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Fig. 6

Wear depth versus applied load of unreinforced alloy and its composites at abrasive grit size of (a) 100 μm and (b) 200 μm

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Fig. 7

Relative wear depth versus applied load of materials at grit size of (a) 200 μm in AC condition, (b) 200 μm in T6 condition, (c) 100 μm in AC condition, and (d) 100 μm in T6 condition

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Fig. 8

The three-dimensional surface profiles of worn surface of as cast pins of (a) matrix alloy at 5 N applied load, (b) matrix alloy at 15 N applied load, (c) hybrid Gr/SiC/Al composite at 5 N applied load, and (d) hybrid Gr/SiC/Al composite at 15 N load applied and grit size 200 μm

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Fig. 9

Worn surfaces of pin samples tested at 200 μm grit size and (a) matrix alloy at 15 N applied load [24], (b) hybrid Gr/SiC/Al composite at 15 N applied load [24], (c) matrix alloy at 5 N applied load [22], and (d) hybrid Gr/SiC/Al composite at 5 N applied load [22]

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Fig. 10

Wear surfaces of emery paper of 200 μm grit size (a) matrix alloy pin at 15 N applied load, (b) hybrid Gr/SiC/Al composite pin at 15 N applied load, (c) matrix alloy pin at 5 N applied load [22], and (d) hybrid Gr/SiC/Al composite pin at 5N applied load [22]

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Fig. 11

Interface bond characteristics between reinforcement and matrix

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Fig. 12

A schematic diagram showing possible mechanism of Gr/SiC/Al 6082 hybrid composites: (a) before engagement of abrasive grit and (b) after engagement of abrasive grit

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Fig. 13

A schematic sketch of (a) an abrasive surface before and after wear and (b) wear debris clogged on abrasive surface

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