Highly magnetostrictive rare earth--iron alloys. Technical report
Technical Report
·
OSTI ID:7257132
Since 1963, it has been known that the rare earth elements possess extraordinary magnetostrictions (approx. .06), far in excess of those characteristic of the magnetic transition metals and alloys. These magnetostrains, however, are available only at cryogenic temperatures. Within the last few years, magnetostrictive strains exceeding .002500 have been achieved at room temperature in rare earth alloys containing Tb and Fe. These alloys possess the largest known room temperature magnetostrictions by far and maintain the largest known magnetomechanical coupling factor (k = 0.6) over wide ranges in applied field. Recently, both positive and negative magnetostrictive materials have been examined. In this technical report, an introduction to the highly magnetostrictive rare earths is given. Measurements on polycrystals and single crystals are presented. The importance of grain orientation in the fabrication of transducer elements is established.
- Research Organization:
- Naval Surface Weapons Center, Silver Spring, MD (USA)
- OSTI ID:
- 7257132
- Report Number(s):
- AD-A-038251; NSWC/WOL/TR-76-99
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
CRYSTAL STRUCTURE
CRYSTALS
DYSPROSIUM ALLOYS
ELASTICITY
ERBIUM ALLOYS
GRAIN ORIENTATION
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETOSTRICTION
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
MICROSTRUCTURE
MONOCRYSTALS
ORIENTATION
PHYSICAL PROPERTIES
POLYCRYSTALS
RARE EARTH ALLOYS
SAMARIUM ALLOYS
TENSILE PROPERTIES
TERBIUM ALLOYS
TRANSDUCERS
360103 -- Metals & Alloys-- Mechanical Properties
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
CRYSTAL STRUCTURE
CRYSTALS
DYSPROSIUM ALLOYS
ELASTICITY
ERBIUM ALLOYS
GRAIN ORIENTATION
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETOSTRICTION
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
MICROSTRUCTURE
MONOCRYSTALS
ORIENTATION
PHYSICAL PROPERTIES
POLYCRYSTALS
RARE EARTH ALLOYS
SAMARIUM ALLOYS
TENSILE PROPERTIES
TERBIUM ALLOYS
TRANSDUCERS