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Research Letters in Materials Science
Volume 2007 (2007), Article ID 27347, 3 pages
http://dx.doi.org/10.1155/2007/27347
Research Letter

Some Material Characteristics of Cold-Sprayed Structures

U.S. Army Research Laboratory, MD 20783-1197, USA

Received 30 July 2007; Accepted 5 November 2007

Academic Editor: Jenn-Ming Yang

Copyright © 2007 Victor K. Champagne et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The deposition and consolidation of metal powders by means of cold spray are methods whereby powder particles are accelerated to high velocity through entrainment in a gas undergoing expansion in a rocket nozzle and are subsequently impacted upon a surface. The impacted powder particles form a consolidated structure which can be several centimeters thick. The characteristics of this structure depend on the initial characteristics of the metal powder and upon impact velocity. The influence of impact velocity on strain hardening and porosity are examined. A materials model is proposed for these phenomena, and model calculation is compared with experiment for the cold spraying of aluminum.