Research Papers: Friction & Wear

Wear Characteristics of NiTi/Al6061 Short Fiber Metal Matrix Composite Reinforced With SiC Particulates

[+] Author and Article Information
Ozgen Akalin1

Department of Mechanical Engineering, Istanbul Technical University, Gumussuyu, Istanbul 34437, Turkeyakalin@itu.edu.tr

K. Vefa Ezirmik

Department of Metallurgical and Materials Engineering, Ataturk University, Erzurum 25240, Turkey

Mustafa Urgen

Department of Metallurgical and Materials Engineering, Istanbul Technical University, Maslak, Istanbul 34469, Turkey

Golam M. Newaz

Department of Mechanical Engineering, Wayne State University, Detroit, MI 48202


Corresponding author.

J. Tribol 132(4), 041603 (Sep 23, 2010) (6 pages) doi:10.1115/1.4002332 History: Received January 31, 2010; Revised July 27, 2010; Published September 23, 2010; Online September 23, 2010

Wear characteristics of Al6061 composites, reinforced with short NiTi fibers, were investigated. The NiTi/Al6061 composite samples were fabricated using pressure-assisted sintering process in ambient air where the NiTi fibers are aligned unidirectional in the Al matrix. In addition, NiTi/Al6061 composite with 5wt%SiC particulates and monolithic Al6061 and Al6061 with 5wt%SiC particulates were processed in similar conditions. The wear tests were performed using a reciprocating tribometer in ball-on-flat configuration where the counterbody material was martensitic steel. The effects of fiber isotropy and SiC reinforcements on wear resistance were experimentally investigated in dry sliding. Wear properties of the samples were studied using an optical profiler and a scanning electron microscope analysis. The results showed that transverse NiTi fibers improve the wear resistance significantly. Samples with transverse fiber orientation show mostly abrasive wear, whereas, monolithic and parallel samples show adhesive wear mechanism. In addition, SiC reinforcements improve the wear resistance of the composite and the monolithic samples. Since the Al6061 matrix material is smeared onto NiTi fibers in a short period, all composite samples show similar frictional characteristics after certain period of running in dry sliding.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

NiTi short fiber orientation

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Figure 2

Wear volume of the samples (μm3)×106

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Figure 3

SEM images of pin wear: (a) NiTi/Al6061 (parallel), (b) NiTi/SiC/Al6061 (parallel), (c) NiTi/Al6061 (transverse), and (d) NiTi/SiC/Al6061 (transverse)

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Figure 4

Optical profiler measurements of the specimens: (a) Al6061, (b) SiC/Al6061, (c) NiTi/Al6061 (transverse), (d) NiTi/AL6061 (parallel), (e) NiTi/SiC/Al6061 (transverse), and (f) NiTi/SiC/Al6061 (parallel)

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Figure 5

SEM images of the worn specimens: (a) Al6061, (b) SiC/Al6061, (c) NiTi/Al6061 (transverse), (d) NiTi/Al6061 (parallel), (e) NiTi/SiC/Al6061 (transverse), and (f) NiTi/SiC/Al6061 (parallel)

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Figure 6

EDS of the specimens on NiTi fiber after the wear test. (Al 6061/SiC /NiTi sample in transverse configuration)



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