Table of Contents
Journal of Metallurgy
Volume 2016 (2016), Article ID 8347063, 8 pages
http://dx.doi.org/10.1155/2016/8347063
Research Article

Structural Analysis and Magnetic Properties of FeCo Alloys Obtained by Mechanical Alloying

1Área Académica de Ciencias de la Tierra y Materiales, UAEH, Carretera Pachuca-Tulancingo Km 4.5, 42184 Pachuca, HGO, Mexico
2Centro de Investigación e Innovación Tecnológica del IPN, 02250 Ciudad de México, DF, Mexico
3Departamento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, 04510 Ciudad de México, DF, Mexico
4Laboratorio de Ingeniería Avanzada, Universidad Politécnica de Tecámac, 55740 Tecámac de Felipe Villanueva, MEX, Mexico

Received 8 March 2016; Revised 6 June 2016; Accepted 12 June 2016

Academic Editor: Gerhard Sauthoff

Copyright © 2016 F. Sánchez-De Jesús 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

A systematic study on the structural and magnetic properties of alloys (, in wt. percent) obtained by mechanical alloying is presented. Elemental powders of Fe and Co mixed in an adequate weight ratio were milled at room temperature in a shaker mixer mill using vials and balls of hardened steel as milling media with a ball : powder weight ratio of 12 : 1. The mixtures were milled for 3 h. The results show that, after milling, for almost all the composition (up to ), solid solutions based on bcc structures were obtained. For Co-rich alloys (), different phases were found, revealing the formation of a metastable intermetallic phase (FeCo, wairauite) together with fcc-Co and hcp-Co phases. The specific saturation magnetization increases by increasing Co content, reaching a maximum value of 225 emu/g for hcp-Fe70Co30, and then it shows a diminution up to 154 emu/g for bcc-Fe30Co70. All studied alloys () present low coercivity, in the range from 0 to 65 Oe, which is lower than reported. The coercivity increases with the increment in Co, reaching a maximum of 64.1 Oe for Fe40Co60. After that, the coercivity falls up to 24.5 Oe for Co-rich alloys, which make them a very low coercive material.