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Research Papers: Friction and Wear

Effect of Heat Treatment on Mechanical and Tribological Properties of Centrifugally Cast Functionally Graded Cu/Al2O3 Composite

[+] Author and Article Information
Manu Sam

Department of Mechanical Engineering,
Amrita School of Engineering,
Amrita Vishwa Vidyapeetham,
Amrita University,
Coimbatore 641112, India
e-mail: manusam.chiramel@gmail.com

N. Radhika

Department of Mechanical Engineering,
Amrita School of Engineering,
Amrita Vishwa Vidyapeetham,
Amrita University,
Coimbatore 641112, India
e-mail: n_radhika1@cb.amrita.edu

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 26, 2017; final manuscript received August 2, 2017; published online October 6, 2017. Assoc. Editor: Nuria Espallargas.

J. Tribol 140(2), 021606 (Oct 06, 2017) (7 pages) Paper No: TRIB-17-1152; doi: 10.1115/1.4037767 History: Received April 26, 2017; Revised August 02, 2017

A functionally graded Cu–10Sn–5Ni metal matrix composite (MMC) reinforced with 10 wt % of Al2O3 particles was fabricated using the centrifugal casting process with dimension Φout100 × Φin85 × 100 mm. The mechanical and wear resistance of the composite has been enhanced through heat treatment. Samples from of the inner zone (9–15 mm) were considered for heat treatment, as this zone has higher concentration of less dense hard reinforcement particles. The samples were solutionized (620 °C/60 min) and water quenched followed by aging at different temperatures (400, 450, and 550 °C) and time (1–3 h). Optimum parametric combination (450 °C, 3 h) with maximum hardness (269 HV) was considered for further analysis. Dry sliding wear experiments were conducted based on Taguchi's L27 array using parameters such as applied loads (10, 20, and 30 N), sliding distances (500, 1000, and 1500 m), and sliding velocities (1, 2, and 3 m/s). Results revealed that the wear rate increased with load and distance whereas it decreased initially and then increased with velocity. Optimum condition for maximum wear resistance was determined using signal-to-noise (S/N) ratio. Analysis of variance (ANOVA) predicted the major influential parameter as load, followed by velocity and distance. Scanning electron microscope (SEM) analysis of worn surfaces predicted the wear mechanism, observing more delamination due to increase in contact patch when applied load increased. Results infer 8% increase in hardness after heat treatment, making it suitable for load bearing applications.

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Figures

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Fig. 1

Centrifugally cast composite specimen

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Fig. 2

Microstrucure of the inner zone after heat treatment

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Fig. 3

XRD spectra of the heat treated Cu–Sn–Ni/Al2O3 composite

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Fig. 4

Variation in hardness value at different parametric combinations of aging done at constant solutionizing parameters

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Fig. 5

Plot for the wear rate

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Fig. 6

SEM analysis of the worn surface at different loads: (a) 10 N and (b) 30 N

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Fig. 7

SEM analysis of the worn surface at different velocities: (a) 1 m/s and (b) 2 m/s

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Fig. 8

SEM analysis of the worn surface at different distances: (a) 500 m and (b) 1500 m

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Fig. 9

SEM analysis of the worn surface at L = 10 N, V = 2 m/s, and D = 500 m

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