Amorphization, Crystallization, and Magnetic Properties of Melt-Spun SmCo7−x(Cr3C2)x Alloys. (20th January 2011)

• Record Type: Journal Article
• Authors: Li, Liya; Xie, Wei
• Other Names: Makino Akihiro Academic Editor.
• Is Part Of: Journal of metallurgy. Volume 2011(2011)
• Publication Date: 2011-01-20
• Subjects: Metallurgy -- Periodicals; Metallurgy; Periodicals; Electronic journals; 669
• DOI: 10.1155/2011/910268
• Languages: English
• ISSNs: 1687-9465

Abstract

Abstract : Effects of Cr3 C2 content and wheel surface speed on the amorphous formation ability and magnetic properties have been investigated for melt-spunSmCo 7 − x ( Cr 3 C 2 ) x (x = 0.10 - 0.25 ) alloys. Ribbon melt-spun at lower wheel speed (30 m/s) has composite structure composed of mostly SmCo7, a small amount of Sm2 Co17, and residual amorphous phases. The grain size of SmCo7 phase decreases with the increase of Cr3 C2 contentx . When melt spinning at 40 m/s, SmCo 7 − x ( Cr 3 C 2 ) x alloys can be obtained in the amorphous state for0.15 ≤ x ≤ 0.25 with intrinsic coerciveH c i of the order of 40–70 Oe. DSC analysis reveals that SmCo7 phase first precipitates from the amorphous matrix at 650 ∘ C, followed by the crystallization of Sm2 Co17 phase at 770 ∘ C. Optimal coercivityH c i of 7.98 kOe and remanent magnetizationM r of 55.05 emu/g have been realized inSmCo 6.8 ( Cr 3 C 2 ) 0 .20 magnet subjected to melt spinning at 40 m/s and annealing at 650 ∘ C for 5 min. The domain structure of the annealed ribbon is composed of interaction domains typically 100–400 nm in size, which indicates the presence of a strong exchange coupling between the grains.