A Study of the Magnetic and Metallurgical Properties of Sm(Co,Fe,Cu,Zr)z Alloys Near z = 8.5.
Abstract
Alloys corresponding to the compositions Sm(Co,Fe,Cu,Zr) have been characterized magnetically and metallurgically. Very large intrinsic coercivities combined with saturation inductions have been obtained for the bulk alloys. If these properties can be incorporated into sintered permanent magnets, energy products should be possible for temperature compensated alloys, and uncompensated alloys. The Sm(Co,Fe,Cu,Zr) alloys were found to behave metallurgically like alloys with similar transition metal content. They form a single phase solid solution at high temperatures which is retained at room temperature by rapid quenching; on reheating to approximately 800 deg. C, the high temperature phase dissociates by a spinodal-like reaction into a cellular microstructure consisting of 2:17 R cells, 1:5 cells and a platelet phase. All phase boundaries are coherent. The platelet phase was determined to have the 2:17 H crystal structure but also Sm-depleted of 2:17 stoichiometry. By comparing lattice constants of the multicomponent alloys with those of Sm2(Co1-xFex)17 alloys at the same Fe levels, it was determined that Zr-vacancy pairs substitute for Fe pairs at the dumbbell sites in the 2:17 R phase at high temperatures.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 07, 1984
- Accession Number
- ADA138253
Entities
People
- A. E. Ray
Organizations
- University of Dayton