Measurements of the elastic stiffness constants of single-crystal SmCo/sub 5/ and of liquid-phase sintered SmCo/sub 5/ permanent magnet material

Journal Article · Wed Jun 01 04:00:00 EDT 1977 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.323980· OSTI ID:7113128

Doane, D A

The five elastic stiffness constants were determined for both single-crystal SmCo/sub 5/ and for the commercially processed liquid-phase sintered (LPS) SmCo/sub 5/ permanent magnet material. The LPS material is an aligned polycrystalline aggregate of SmCo/sub 5/ crystallites oriented so that their magnetically easy c axes are approximately parallel. The elastic constants were obtained from the velocities of propagation of ultrasound in various directions in samples of known thickness and density. For the single crystal, the room-temperature values of the constants (in units of 10/sup 12/ dyn/cm/sup 2/) are c/sub 11/=1.968 +- 2%, c/sub 12/=1.032 +- 4%, c/sub 13/=1.049 +- 4%, c/sub 33/=2.398 +- 2%, and c/sub 44/=0.483 +- 2%, and for the LPS permanent magnet material, c/sub 11/=1.330 +- 2%, c/sub 12/=0.616 +- 5%, c/sub 13/ =0.485 +- 5%, c/sub 33/=1.659 +- 2%, and c/sub 44/=0.419 +- 2%. The decrease in elastic constants in SmCo/sub 5/ relative to cobalt can be related qualitatively to a corresponding decrease in the number of nearest-neighbor cobalt bonds in SmCo/sub 5/.

• Research Organization: Box 21, Berkeley Heights, New Jersey 07922
• OSTI ID: 7113128
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 48:6; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
COBALT ALLOYS
COBALT BASE ALLOYS
CRYSTALS
ELASTICITY
MAGNETS
MECHANICAL PROPERTIES
MONOCRYSTALS
PERMANENT MAGNETS
RARE EARTH ALLOYS
SAMARIUM ALLOY
SAMARIUM ALLOYS
SINTERED MATERIALS
SOUND WAVES
TENSILE PROPERTIES
ULTRASONIC WAVES