IRON-GADOLINIUM PHASE DIAGRAM
Data from the investigation of the iron-gadolinium phase diagram revealed a single eutectic system with very limited terminal solubility and three intermediate phases. The eutectic point occurs at about 85 percent gadolinium, and the eutectic isotherm, which occurs at 850 deg C, extends from the compound Fe/sub 2/Gd to 99-plus percent gadolinium. Very little solubility of the solid phases in each other was observed. The three intermediate phases, Fesub 9/Gd, Fe/ sub 3/Gd, and Fe/sub 2/Gd, melt incongruently at peritectic isotherms at 1320, 1l50, and 1080 deg C, respectively. The crystalline systems of the three phases were determined as follows: Fe/sub 9/Gd, hexagonal; Fe/sub 3/Gd, hexagonal or rhombohedral; and Fe/sub 2/Gd, face-centered cubic. No lowering or raising of the alphagamma iron transformation at 9l0 deg C, the gamma-delta iron transformation at 1388 deg C, or the gadolinium transformation at l262 deg C was observed. The principal methods used in determining the iron--gadolinium phase diagram were melting-point determinations, thermal analyses, metallographic examination, and x-ray diffraction analyses. Melting, heat treating, and thermal analyses were conducted in a vacuum or under a helium atmosphere because of the avidity with which oxygen combines with gadolinium at elevated temperatures. A few hardness values were determined, but they had no part in the derivation of the phase diagram. No other mechanical properties were determined. (auth)
- Research Organization:
- Bureau of Mines. Albany Metallurgy Research Center, Ore.
- NSA Number:
- NSA-16-012086
- OSTI ID:
- 4806809
- Report Number(s):
- BM-RI-5925
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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THE PHASE DIAGRAM OF THE TITANIUM-GADOLINIUM SYSTEM
QUARTERLY METALLURGICAL PROGRESS REPORT NO. 8 FOR THE PERIOD OF JULY 1, 1960 TO SEPTEMBER 30, 1960
Related Subjects
CHEMICAL REACTIONS
COMPOUNDS
CONFIGURATION
CRYSTALS
DIFFRACTION
ENVIRONMENT
EUTECTICS
EXPANSION
GADOLINIUM
GADOLINIUM ALLOYS
HARDNESS
HEAT TREATMENTS
HELIUM
HIGH TEMPERATURE
INERT GASES
INTERMETALLIC COMPOUNDS
IRON
IRON ALLOYS
IRON- GAMMA
IRON-ALPHA
IRON-DELTA
LATTICES
MECHANICAL PROPERTIES
MELTING
MELTING POINTS
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
OXYGEN
PERITECTICS
PHASE DIAGRAMS
QUANTITATIVE ANALYSIS
SOLID SOLUTIONS
SOLIDS
SOLUBILITY
THERMAL ANALYSIS
VACUUM
X RADIATION