Microstructure of aged (Co,Cu,Fe)7Sm magnets
- 1 March 1977
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 48 (3), 1350-1354
- https://doi.org/10.1063/1.323729
Abstract
The microstructure of (Co,Cu,Fe)7Sm magnets has been characterized at various states of aging by transmission electron microscopy. At peak magnet properties, the magnet consists of cells of 17 : 2 phase about 500 Å in diameter, separated by a thin continuous fully coherent 5 : 1 boundary phase. This structure evolved by precipitation of ordered 17 : 2 particles from a disordered 5 : 1 matrix, and coarsens with aging until full coherence is lost and the cellular structure breaks up. The overaged alloy consists of semicoherent 5 : 1 particles in a 17 : 2 matrix, with a single set of interface dislocations accommodating the lattice mismatch. The effect of these various microstructural changes on domain‐wall pinning and coercivity is discussed.Keywords
This publication has 15 references indexed in Scilit:
- Statistical theory of the pinning of Bloch walls by randomly distributed defectsJournal of Magnetism and Magnetic Materials, 1975
- Incoherent nucleation of reversed domains in Co5Sm permanent magnetsJournal of Magnetism and Magnetic Materials, 1975
- Magnetic Properties of Sm-Co-Fe-Cu Alloys for Permanent Magnet MaterialsJapanese Journal of Applied Physics, 1975
- Phase stability of Co5SmIEEE Transactions on Magnetics, 1974
- The coarsening of γ' precipitates at large volume fractionsActa Metallurgica, 1974
- Discontinuous coarsening of aligned eutectoidsActa Metallurgica, 1974
- The structure of Co-Cu-Fe-Ce permanent magnetsIEEE Transactions on Magnetics, 1973
- Mechanical, magnetic and superconductor hardening by precipitatesMaterials Science and Engineering, 1972
- Critical Fields Determining Magnetic Coercivity in Microparticles of SmCo5 and LaCo5Journal of Applied Physics, 1971
- Intermetallic compounds in the system samarium-cobaltJournal of the Less Common Metals, 1968