Title

Forming Ai-Ai2O3 Nanocomposite Surfaces Using Friction Stir Processing

Keywords

Aluminum; Friction stir processing; Nanocomposite; Surface engineering; Wear resistance

Abstract

This study presents a solid-state process based nanocomposite surface engineering approach. Friction stir processing was used to stir and mix nano-sized Al2O3 particles into a pure aluminum surface to form a high-particle-concentration (up to 20 vol%) AI-AI2O 3 nanocomposite layer of up to several millimeters thick. Compared with an unprocessed aluminum surface, the nanocomposite surface demonstrated increased hardness (by 3x) and yield strength (by 10x), and reduced friction coefficient (by 55%) and wear rate (by 100x). A high matrix dislocation density revealed by transmission electron microscopy is believed to be largely responsible for such significant improvements. Neutron diffraction measurements indicated tensile residual stress in the aluminum matrix that was mainly induced by the thermal-expansion mismatch between aluminum and alumina.

Publication Date

11-23-2009

Publication Title

Transactions of the North American Manufacturing Research Institution of SME

Volume

37

Number of Pages

349-356

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

69549095677 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/69549095677

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