THE PHASE DIAGRAM OF THE COBALT-GADOLINIUM SYSTEM

Journal Article · Wed Oct 31 23:00:00 EST 1962 · Zh. Neorgan. Khim.

OSTI ID:4753930

Savitskii, E M; Terekhova, V F; Burov, I V

The Co--Gd alloy system was investigated throughout the whole composition range by microstructure determination methods, differential thermal analysis, and microhardness measurements. Twenty-five alloy compositions were prepared by melting the mixtures in an arc furnace. The microstructure of the specimens indicated that the solubility of Gd in Co and of Co in Gd at room temperature does not exceed 0.2 to 0.3 wt%; alloys containing 1.0% of Gd and 0.5% of Co presented large amounts of a eutectic second phase. The existence of 8 previously reported comPounds, GdCo/sub 5/, GdCo/sub 4/, GdCo/sub 2/, GdCo/sub 2/ , GdCo, and Gd/sub 3/C o, were confirmed together with a new compound Gd/sub 2/Co/ sub 17/ which has a trigonal crystal structure with the following parameters: a = 8.535 kX; c = 12.429 kX; and c/a = 1.458. Two eutectic mixtures were found at the Co side of the diagram together with 2 Gd-rich compounds, CoGd/sub 3/ and CoGd. Hardness changes showed that addition of Gd strengthened somewhat the alpha -Co in the solid solution range; in the 2-phase region the hardness increased with increasing Co/sub 17/Gd/sub 2/ content. Addition of Gd decreased the specific magnetization at room temperature. The compound Co/sub 17/Gd/sub 2/ is expected to be antiferromagnetic at low temperatures. (TTT)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-003530
• OSTI ID: 4753930
• Journal Information: Zh. Neorgan. Khim., Journal Name: Zh. Neorgan. Khim. Vol. Vol: 7
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ALLOTROPY
ANTIFERROMAGNETISM
COBALT
COBALT ALLOYS
CRYSTALS
ELECTRIC ARCS
EUTECTICS
EXPANSION
FERROMAGNETISM
FURNACES
GADOLINIUM
GADOLINIUM ALLOYS
HARDNESS
INTERMETALLIC COMPOUNDS
LATTICES
LOW TEMPERATURE
MAGNETISM
MEASURED VALUES
MELTING
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
PHASE DIAGRAMS
PREPARATION
SOLID SOLUTIONS
SOLUBILITY
TEMPERATURE
THERMAL ANALYSIS