Published March 2009 | Version v1
Journal article Metadata-only

Magnetic properties and grain-boundary structure transition of melt-spun (Sm0.12Co0.87Cu0.01)97(VC)3 under annealing

Creators

  • 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083 (China) and Ninggbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201 (China)
  • 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083 (China)
  • 3. Ninggbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201 (China)

Description

Effects of annealing treatment on the magnetic properties and microstructure of SmCo7-based magnets doped with VC and Cu were investigated. The coercivity of the as-spun ribbons (Sm0.12Co0.87Cu0.01)97(VC)3 was 3.6 kOe. It was increased to 7.3 kOe after annealing at 800 deg. C for 15 min. A fixed single 1:7H structure and regular 1:7H dendrite grains with long axes preferentially parallel to each other had been attained during rapid solidification and subsequent annealing treatment. However, TEM results revealed that there was grain-boundary phase rich in C and Cu besides 1:7H phase in the as-solidified ribbon. After annealing, the grain-boundary phase decomposed to Cu-, Sm- and C-rich intergranular phases. Cu-, Sm- and C-rich regions formed at the grain boundaries after annealing improved the coercivity of (Sm0.12Co0.87Cu0.01)97(VC)3 by decreasing the magnetostatic interactions and act as effective domain wall pinning sites

Availability note (English)

Available from http://dx.doi.org/10.1016/j.jmmm.2008.09.023

Additional details

Identifiers

DOI
10.1016/j.jmmm.2008.09.023;
PII
S0304-8853(08)00957-8;

Publishing Information

Journal Title
Journal of Magnetism and Magnetic Materials
Journal Volume
321
Journal Issue
5
Journal Page Range
p. 361-364
ISSN
0304-8853
CODEN
JMMMDC

INIS

Country of Publication
Netherlands
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
40056133
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
ANNEALING; CARBON; COBALT ALLOYS; COERCIVE FORCE; COPPER ALLOYS; DOPED MATERIALS; GRAIN BOUNDARIES; INTERACTIONS; MAGNETIC FLUX; MAGNETIC PROPERTIES; MAGNETS; SAMARIUM ALLOYS; SOLIDIFICATION; TRANSMISSION ELECTRON MICROSCOPY; VANADIUM
Descriptors DEC
ALLOYS; ELECTRON MICROSCOPY; ELEMENTS; EQUIPMENT; HEAT TREATMENTS; MATERIALS; METALS; MICROSCOPY; MICROSTRUCTURE; NONMETALS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; RARE EARTH ALLOYS; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENTS

Optional Information

Copyright
Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.