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Research Papers: Micro-Nano Tribology

Synthesis and Characterization of Al/Al3Fe Nanocomposite for Tribological Applications

[+] Author and Article Information
Rahul Agarwal

Centre of Advanced Study,
Department of Metallurgical Engineering,
Indian Institute of Technology,
Banaras Hindu University,
Varanasi 221005, India

Anita Mohan

Department of Physics,
Indian Institute of Technology,
Banaras Hindu University,
Varanasi 221005, India

Sunil Mohan

Centre of Advanced Study,
Department of Metallurgical Engineering,
Indian Institute of Technology,
Banaras Hindu University,
Varanasi 221005, India
e-mail: smohan_1@yahoo.com; smohan.met@itbhu.ac.in

Rakesh Kr. Gautam

Department of Mechanical Engineering,
Indian Institute of Technology,
Banaras Hindu University,
Varanasi 221005, India

1Current address: Doctoral student at Materials Science Engineering, Department at University of Pennsylvania, Philadelphia, PA 19104.

2Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 8, 2013; final manuscript received May 15, 2013; published online November 18, 2013. Assoc. Editor: Dae-Eun Kim.

J. Tribol 136(1), 012001 (Nov 18, 2013) (9 pages) Paper No: TRIB-13-1016; doi: 10.1115/1.4025601 History: Received January 08, 2013; Revised May 15, 2013

Aluminum based composites find diverse applications due to their superior mechanical and physical properties. Aluminum matrix nanocomposites have been synthesized with Al3Fe nanocrystalline intermetallics reinforcement using the powder metallurgy route. The prepared composites have been characterized for various physical and mechanical properties such as density measurement, bulk hardness, compressive strength, and tribological properties. The theoretical coefficient of the linear thermal expansion has also been predicted. The composite shows a high strength to weight ratio and excellent wear resistance, along with a low coefficient of friction. The observed wear rate is superior to other composites irrespective of the load and sliding velocity chosen for the study and it continuously decreases withan increasing amount of dispersoid.

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Figures

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Fig. 1

XRD of (a) pure aluminum and (b) pure iron

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Fig. 2

(a) XRD plots of the powder sample with increasing milling time and (b) the Williamson–Hall plot

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Fig. 3

(a) Variation of the crystallite size and (b) crystallite strain with milling time

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Fig. 4

SEM micrograph of the (a) unsintered and (b) sintered sample. (The inset shows the EDX spectra.)

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Fig. 5

(a) TEM micrograph of an agglomerated Al3Fe powder and (b) EDP of the Al3Fe powder

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Fig. 6

(a) Differential thermal analysis (DTA) curve for the powder sample and (b) thermogravimetry analysis (TGA) curve for the powder sample

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Fig. 7

Variation of (a) density, (b) hardness, (c) elastic modulus, and (d) ultimate and yield strength with wt. % Al3Fe

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Fig. 8

(a) Variation of the coefficient of friction with wt. % Al3Fe at 20 N load and 1 m/s sliding velocity and (b) wear rate with wt. % Al3Fe with a different load

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Fig. 9

Variation of the average coefficient of friction with (a) sliding distance at 60 N load and 1 m/s sliding velocity and (b) with the normal load

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Fig. 10

(a) Bulk wear versus sliding distance for different Al-Al3Fe composites at 20 N applied load and sliding velocity, (b) wear rate versus applied load for different Al-Al3Fe composites at 1 m/s sliding velocity, and (c) wear rate versus sliding velocity for different Al-Al3Fe composites at 20 N applied load

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Fig. 11

SEM micrograph of the worn surface of the composite after the final sliding distance under a normal load of 60 N at 1 m/s: (a)Al 5 wt. % Al3Fe, (b) Al 10 wt. % Al3Fe, (c) Al 15 wt. % Al3Fe, and (d) Al 20 wt. % Al3Fe

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