Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 16: Microstructure and Phase Transformations III - Precipitaion hardening/ Alloying elements
MM 16.6: Vortrag
Montag, 31. März 2014, 17:00–17:15, IFW B
Droplet size distribution in liquid phase separated Cu75Co25-xMx (M = Fe, Ni) alloys with low M content — •Yikun Zhang1,2, Zhikang Wu1, Meimei Wang1, Jianrong Gao1, Chao Yang1, and Gerhard Wilde2 — 1Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110004, China — 2Institute of Materials Physics, University of Münster, Wilhelm-Klemm-Straße 10, D-48149 Münster, Germany
Liquid phase separation in metallic alloys has been investigated over the past sixty years. One of the most intensively studied systems is the binary Cu-Co system, which is a simple peritectic system, but has a metastable miscibility gap in the undercooled region because of a positive heat of mixing. A recent study indicated that a Zr addition can modify the surface energies and/or the wetting behavior in a peculiar way in the ternary Co-Cu-Zr system at low Zr content. In the present work, the effect of small amounts of an Fe/Ni addition on the liquid phase separation behavior in undercooled Cu75Co25-xMx (M = Fe, Ni and x = 1, 5) alloys has been studied by using the glass fluxing method. All the samples show a bimodal droplet size distribution, the center of the first peak position shifts to a larger radius gradually with increasing undercooling in Cu75Co24Ni. The Fe addition can promote the liquid phase separation behavior, but in contrast the Ni addition can suppress it effectively. The present results may provide valuable information for understanding the microstructure evolution in undercooled Cu-Co alloys.