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Investigation on Nd2Fe14B/α-Fe nanocomposite magnets microalloyed with refractory elements

ZHANYONG WANG1,* , WENQING LIU2, MINGLIN JIN1, YANLI SUI3

Affiliation

  1. Department of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418
  2. Institute of Materials Science, Shanghai University, Shanghai 200072
  3. State Key Laboratory for Advanced Metals and Materials, USTB, Beijing 100083

Abstract

The microstructure and magnetic properties for Nd2Fe14B/α-Fe nanocomposite magnets with Nb and Zr additions have been investigated. Zr-enriched clusters with 2~3 nm and 7×106/μm3 in the size and number densities, respectively, have been found in as-spun amorphous ribbons. The concentration of Zr atom is about 30 at% for the clusters with total number of atoms higher than 40, which is about 9 times than its nominal composition and helpful to the grain refinement. With the addition of Zr and Nb elements, a fine and uniform microstructure with about 20~30 nm in grain size is obtained, which leads to the enhancement of the interaction coupling between the grains and improves the magnetic properties. The coercivity mechanism for nanocomposite magnets changes from nucleation mechanism for alloy without microalloyed elements to pinning mechanism for nanocomposites bearing with Nb and Zr..

Keywords

Coercivity mechanism; Nd2Fe14B/α-Fe; Crystallization; Elemental distribution.

Submitted at: Dec. 24, 2011
Accepted at: June 6, 2012

Citation

ZHANYONG WANG, WENQING LIU, MINGLIN JIN, YANLI SUI, Investigation on Nd2Fe14B/α-Fe nanocomposite magnets microalloyed with refractory elements, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 5-6, pp. 467-472 (2012)