Dendritic Growth of Graphite from Melts

Journal Article · Sat May 26 04:00:00 EDT 1962 · Nature (London)

DOI:https://doi.org/10.1038/194765a0· OSTI ID:4828412

MINKOFF, I.; EINBINDER, I.

Observations are reported on the dendritic growth of graphite from Ni--C melts. Ni shot was melted in graphite crucibles, held at 1450 deg C to saturate the melt, and cooled at a rate of 15 deg C/min. Large discontinuous plates of primary graphite were observed, separated from eutectic graphite by the alpha phase. Large growth steps averaging 0.01 mm were observed in the crystal interior, while at the surface smaller steps of 0.001 mm height were measured. No evidence was found for screw dislocations, but systems of concentric circular steps or hexagonal steps were observed. It is concluded that the dendritic graphlte grows by repeated nucleation of steps which advance as a series of macro- steps into the liquid. (D.L.C.)

• Research Organization: Faculty of Mechanical Engineering, Technion, Haifa, Israel
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-021066
• OSTI ID: 4828412
• Journal Information: Nature (London), Journal Name: Nature (London) Journal Issue: 4830 Vol. 194; ISSN 0028-0836
• Publisher: Nature Publishing Group
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CONFIGURATION
COOLING
CRUCIBLES
CRYSTALLIZATION
CRYSTALS
DEFECTS
DENDRITES
DISLOCATIONS
EUTECTICS
GRAIN SIZE
GRAPHITE
HIGH TEMPERATURE
LIQUIDS
MELTING
METALS, CERAMICS, AND OTHER MATERIALS
NICKEL
NICKEL CARBIDES
NUCLEATE BOILING
PELLETS
PHASE DIAGRAMS
PLATES
SURFACES
THICKNESS