Abstract
The severe segregation of tin during solidification of CuNiSn alloys provides a major barrier to their commericial application. In the present study, rapid solidification has been explored as a means of obtaining chemically homogeneous microstructures. Melt-spun ribbons of thicknesses from 20 to 120 μm were characterized by microscopy and by electron microprobe analysis. Although the degree of segregation and segregation spacing were refined by rapid solidification, it was not possible to obtain chemically homogeneous material even in 20 μm thick ribbons and precipitation of a second phase was observed at grain boundaries in ribbons thicker than about 40 μm. The age-hardening response of ribbon 20 μm thick was similar to that of alloys produced by conventional processing.
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