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Microstructure and wear behaviour of aluminium alloys containing embedded nanoscaled lead dispersoids

Bhattacharya, Victoria and Chattopadhyay, K (2004) Microstructure and wear behaviour of aluminium alloys containing embedded nanoscaled lead dispersoids. In: Acta Materialia, 52 (8). pp. 2293-2304.

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We report the early stage friction and wear characteristics of aluminium containing nanosized lead dispersions. The nanocomposite was produced by rapid solidification. The experimental results indicate a significant decrease in friction and wear rate in comparison to its coarse grained counterparts. We show that the observed results suggest an adhesive type of wear mechanism. However, increase in hardness due to refinement of the aluminium grains cannot quantitatively rationalize the results. We explore and discuss the role of nanoscaled lead particles and the mass transport between the sample and counterface via mechanical alloying, in the formation of tribolayers affecting the tribological properties. The plane view and cross-sectional transmission electron microscopy reveals significant elongation as well as coarsening of the lead particles during the process of wear. We attempt to understand these results in the framework of moving dislocations and their assistance to the mass transport among the dispersed lead particles.

Item Type: Journal Article
Publication: Acta Materialia
Publisher: Elsevier
Additional Information: The copyright belongs to Elsevier.
Keywords: Nano particles;Wear;Diffusion;Coarsening;Dislocation
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 17 May 2006
Last Modified: 19 Sep 2010 04:26
URI: http://eprints.iisc.ac.in/id/eprint/6715

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