Article ID Journal Published Year Pages File Type
1624625 Journal of Alloys and Compounds 2008 6 Pages PDF
Abstract

Cu77Cr23 − XZrX (X = 1, 2, 3) and Cu82 − XCr18ZrX (X = 6, 10) (at.%) ribbons were prepared by melt spinning in order to obtain finer Cr particles in Cu–Cr contact materials. Microstructural analyses reveal that the Cr particles from liquid phase separation can be refined to 50 nm when Cr content is in a range of 18–22 at.% and Zr addition is more than 3%. Meanwhile, Cu5Zr precipitations in nano-scale were observed in the ribbons. The thermodynamic analyses indicate that Zr addition has reduced the large positive mixing heat between Cu and Cr, which resulted in the liquid phase separation occurring at a lower temperature and a smaller nucleation driving force. Therefore, Zr addition can partly restrain the liquid phase separation of Cu–Cr alloy during rapid cooling and then Cr particles have been refined.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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