In order to obtain rapidly solidified ribbons, it is important to control and understand the mechanism of ribbon formation. In this study, rapidly solidified Cu-Sn ribbons were produced by water jet cooled rotating disc method. The produced ribbons had typically 15-95 mu m thickness, 3-6 mm width and 45-72 mm length depending on process parameters. Increasing the disc speed from 50 to 75 m s(-1) resulted in a decrease of ribbon thickness from 75 to 34 mu m. From the disc-side to the air-side surface of the ribbons, the microstructure of the ribbons consisted of three distinct zones: fine grained microstructure (chill region), columnar zone and cellular/equiaxed region. The columnar zone/ribbon thickness ratio decreased with increasing ribbon thickness. The estimated cooling rates of 20 and 90 mu m thick ribbons were 1.98 x 10(6) and 5.49 x 10(3) K s(-1), respectively.(C) 2011 Elsevier B.V. All rights reserved.