Study of the magnetic and metallurgical properties of Sm(Co,Fe,Cu,Zr)z alloys near z = 8. 5. Final report 16 Jul 81-31 Oct 83

Technical Report · Tue Feb 07 00:00:00 EST 1984

OSTI ID:7026409

Ray, A E

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.

• Research Organization: Dayton Univ., OH (USA). Research Inst.
• OSTI ID: 7026409
• Report Number(s): AD-A-138253/0; UDR-TR-84-08
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT ALLOYS
CRYSTAL STRUCTURE
MAGNETIC PROPERTIES
COPPER ALLOYS
IRON ALLOYS
SAMARIUM ALLOYS
ZIRCONIUM ALLOYS
AGE HARDENING
ANISOTROPY
CHEMICAL COMPOSITION
CRYSTAL LATTICES
HIGH TEMPERATURE
LATTICE PARAMETERS
METALLURGY
MICROSTRUCTURE
PERMANENT MAGNETS
PHASE TRANSFORMATIONS
QUENCHING
SOLID SOLUTIONS
ALLOYS
DISPERSIONS
HARDENING
MAGNETS
MIXTURES
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SOLUTIONS
360104* - Metals & Alloys- Physical Properties
360102 - Metals & Alloys- Structure & Phase Studies