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Advances in Condensed Matter Physics - Volume 2015 2015, Article ID 865695, 7 pages -

Research Article

Department of Materials Engineering SEISAN, Yokohama National University, 79-5 Tokiwadai, Hodogayaku, Yokohama 240-8501, Japan

Advanced Electron Microscopy Group, National Institute of Materials, Sakura 3-13-3, Tsukuba 305-0003, Japan

Received 31 March 2015; Accepted 28 September 2015

Academic Editor: Victor V. Moshchalkov

Copyright © 2015 N. Wada et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This work investigates the evolution of microstructures and magnetic properties during isothermal annealing of Cu-Fe-Co alloys, using electron microscopy and superconducting quantum interference device SQUID magnetometry. Small coherent granular precipitates composed of iron and cobalt formed in the copper matrix in the early stage of precipitation. As annealing proceeded, the precipitates lost coherency to the matrix after reaching a size of 15–20 nm and twin-like structures were consecutively introduced in the particles. The SQUID measurements revealed that the magnetic properties of the specimens correlated with the microstructural evolution. The coercive force initially increased with annealing time but decreased after reaching a peak. Lorentz Microscopy suggested that the initial large increase of magnetization was invoked by a structural transition from fcc to B2 in the precipitates.





Autor: N. Wada, K. Kuwada, J. S. Kim, M. Takeguchi, and M. Takeda

Fuente: https://www.hindawi.com/



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