Structural Analysis and Magnetic Properties of FeCo Alloys Obtained by Mechanical Alloying. (13th July 2016)

• Record Type: Journal Article
• Authors: Sánchez-De Jesús, F.; Bolarín-Miró, A. M.; Cortés Escobedo, C. A.; Torres-Villaseñor, G.; Vera-Serna, P.
• Other Names: Sauthoff Gerhard Academic Editor.
• Is Part Of: Journal of metallurgy. Volume 2016(2016)
• Publication Date: 2016-07-13
• Subjects: Metallurgy -- Periodicals; Metallurgy; Periodicals; Electronic journals; 669
• DOI: 10.1155/2016/8347063
• Languages: English
• ISSNs: 1687-9465

Abstract

Abstract : A systematic study on the structural and magnetic properties ofF e 100 - x C o x alloys (10 < x < 90, Δ x = 10 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 tox = 60 ), solid solutions based on bcc structures were obtained. For Co-rich alloys (x ≥ 70 ), 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-Fe70 Co30, and then it shows a diminution up to 154 emu/g for bcc-Fe30 Co70 . All studied alloys (F e 100 - x C o x ) 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 Fe40 Co60 . After that, the coercivity falls up to 24.5 Oe for Co-rich alloys, which make them a very low coercive material.