Yaomin Zhu

Microstructures of melt-spun Cu100-x-Crx (x=3.4-25) ribbons

Abstract Cu 100− x –Cr x ( x =3.4–25) ribbons were prepared by melt-spinning. Examination revealed that a supersaturated solid solution and a few very fine Cr-rich particles can be obtained for the Cu 96.6 Cr 3.4 ribbon. When x is ≥9, a microstructure with refined Cu- and Cr-rich phases can be obtained by melt spinning. The analyses indicated that the Cr-rich phase in the ribbons may be formed in two ways. One is the direct solidification from the liquid alloys during melt spinning, the diameter range of the Cr-rich particles formed lying between 30 and 200 nm. The other is the solid-phase separation of a Cu-rich supersaturated solid solution, the diameter of Cr-rich particles formed being only several nanometers.