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Research Papers: Friction and Wear

Investigation on Mechanical Properties and Analysis of Dry Sliding Wear Behavior of Al LM13/AlN Metal Matrix Composite Based on Taguchi's Technique

[+] Author and Article Information
N. Radhika

Department of Mechanical Engineering,
Amrita School of Engineering, Coimbatore,
Amrita Vishwa Vidyapeetham,
Amrita University,
Coimbatore 641 112, India
e-mail: n_radhika1@cb.amrita.edu

R. Raghu

Department of Metallurgical Engineering,
PSG College of Technology, Coimbatore,
Coimbatore 641 004, India

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 2, 2016; final manuscript received October 20, 2016; published online April 4, 2017. Assoc. Editor: Robert Wood.

J. Tribol 139(4), 041602 (Apr 04, 2017) (10 pages) Paper No: TRIB-16-1147; doi: 10.1115/1.4035155 History: Received May 02, 2016; Revised October 20, 2016

LM13/AlN (10 wt. %) metal matrix composites (MMC) and unreinforced aluminum alloy were produced under stir casting route. Microstructural characteristics were examined on the developed composite using optical microscope. The hardness and tensile test were carried out on both unreinforced aluminum alloy and composite using Vickers hardness tester and universal testing machine (UTM), respectively. Dry sliding wear behavior of the composite and unreinforced aluminum alloy was evaluated using pin-on-disk tribometer based on the design of experiments approach. Experimental parameters such as applied load (10, 20, and 30 N), velocity (1, 2, and 3 m/s), and sliding distance (500, 1000, and 1500 m) were varied for three levels. Signal-to-noise (S/N) ratio analysis, analysis of variance, and regression analysis were also performed. The characterization results showed that reinforcement particles were uniformly distributed in the composite. The hardness and tensile test revealed greater improvement of property in composite compared to that of unreinforced alloy. Wear plot showed that wear was increased with increase in load and decreased with increase in velocity and sliding distance. S/N ratio analysis and analysis of variance (ANOVA) indicated that load has greater significance over the wear rate followed by velocity and sliding distance. Regression analysis revealed greater adequacy with the constructed model in predicting the wear behavior of composite and unreinforced aluminum alloy. Scanning electron microscopy (SEM) analysis is evident that the transition of wear from mild to severe occurred on increase of the load in the composite.

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References

Figures

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Fig. 1

SEM micrograph of the AlN reinforcement particles

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Fig. 2

Microstructure of the LM13/AlN composite

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Fig. 3

SEM fractograph of the tensile specimens (a) composite and (b) unreinforced alloy

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Fig. 4

(a) Main effect plot for means–wear rate (composite) and (b) main effect plot for means–wear rate (unreinforced aluminum alloy)

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Fig. 5

(a) Main effect plot for S/N ratio–wear rate (composite) and (b) main effect plot for S/N ratio–wear rate (unreinforced aluminum alloy)

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Fig. 6

SEM examination on the worn surfaces of composite: (a) L = 10 N, V = 1 m/s, S = 500 m, (b) L = 20 N, V = 1 m/s, S = 500 m, (c) L = 30 N, V = 1 m/s, S = 500 m, (d) L = 30 N, V = 3 m/s, S = 500 m, and (e) L = 30 N, V = 3 m/s, S = 1500 m

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Fig. 7

SEM examination of the composite surface worn at optimum condition

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