Accession Number : ADA138253

Title :   A Study of the Magnetic and Metallurgical Properties of Sm(Co,Fe,Cu,Zr)z Alloys Near z = 8.5.

Descriptive Note : Final rept. 16 Jul 81-31 Oct 83,


Personal Author(s) : Ray,A E

PDF Url : ADA138253

Report Date : 07 Feb 1984

Pagination or Media Count : 18

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.

Descriptors :   *Magnetic alloys, *Rare earth alloys, *Transition metals, *Magnetic properties, Metallurgy, Permanent magnets, Heat treatment, High temperature, Phase transformations, Chemical composition, Samarium, Cobalt, Iron, Copper, Zirconium, Curie temperature, Microstructure, Crystal lattices, Crystal structure, Anisotropy, Quenching, Isotherms, Age hardening

Subject Categories : Properties of Metals and Alloys
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE