Formation of bcc non-equilibrium La, Gd and Dy alloys and the magnetic structure of Mg-stabilized. beta. Gd and. beta. Dy
Technical Report
·
OSTI ID:6418268
The high temperature bcc allotrope of a rare earth metal has the potential for substantially different magnetic properties than the room temperature hexagonal (hcp or dhcp) counterpart because of its more symmetrical crystal field. The stabilization by alloying and quenching of this bcc phase was studied for La-M alloys where M is an non-rare earth metal from Group II or III. The factors influencing the stabilization, such as size of M and quench rate, are discussed. ..gamma..La (bcc) could be retained over a composition range around the eutectoid composition by Mg or Cd alloying. A comparison of T/sub o/ curves of the various alloy systems suggest that the eutectoid temperature of the La-M system must be approximately equal to or less than a critical T/sub o/ temperature of 515/degree/C if the bcc phase is to be retained by quenching. The thermal stability of ..beta..Gd (bcc) was investigated by DTA and isothermal annealing. It was found to transform to an intermediate phase before reverting to the equilibrium phases in contrast to ..gamma..La alloys which decompose directly on heating to the equilibrium phases. 71 refs., 52 figs., 7 tabs.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6418268
- Report Number(s):
- IS-T-1358; ON: DE89007573
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
ANNEALING
ANTIFERROMAGNETISM
BCC LATTICES
BINARY ALLOY SYSTEMS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DIAGRAMS
DIFFRACTION
DYSPROSIUM ALLOYS
DYSPROSIUM BASE ALLOYS
EUTECTICS
FERROMAGNETISM
GADOLINIUM ALLOYS
GADOLINIUM BASE ALLOYS
HEAT TREATMENTS
LANTHANUM ALLOYS
LANTHANUM BASE ALLOYS
LATTICE PARAMETERS
MAGNESIUM ALLOYS
MAGNETIC PROPERTIES
MAGNETISM
MICROSTRUCTURE
PHASE DIAGRAMS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SAMPLE PREPARATION
SCATTERING
SPIN GLASS STATE
X-RAY DIFFRACTION
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
ANNEALING
ANTIFERROMAGNETISM
BCC LATTICES
BINARY ALLOY SYSTEMS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DIAGRAMS
DIFFRACTION
DYSPROSIUM ALLOYS
DYSPROSIUM BASE ALLOYS
EUTECTICS
FERROMAGNETISM
GADOLINIUM ALLOYS
GADOLINIUM BASE ALLOYS
HEAT TREATMENTS
LANTHANUM ALLOYS
LANTHANUM BASE ALLOYS
LATTICE PARAMETERS
MAGNESIUM ALLOYS
MAGNETIC PROPERTIES
MAGNETISM
MICROSTRUCTURE
PHASE DIAGRAMS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SAMPLE PREPARATION
SCATTERING
SPIN GLASS STATE
X-RAY DIFFRACTION