Synthesis and characterization of the nanostructured solid solution with extended solubility of graphite in nickel by mechanical alloying

In the present work, mechanical alloying of a powder mixture of nickel and graphite (up to 15wt%) was carried out in an attrition mill under a nitrogen atmosphere. The as-milled powders were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron micro...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2019-08, Vol.26 (8), p.1031-1037
Main Authors: Kundan, Nitika, Parida, Biswajit, Keshri, Anup Kumar, Soni, Prathvi Raj
Format: Article
Language:English
Subjects:
Alloy powders
Atoms & subatomic particles
Carbon
Ceramics
Characterization and Evaluation of Materials
Chemical vapor deposition
Chemistry and Materials Science
Composites
Corrosion and Coatings
Crystallites
Electron microscopy
Glass
Grain size
Graphite
Grinding mills
Lattice strain
Materials Science
Mechanical alloying
Metallic Materials
Morphology
Natural Materials
Nickel
Powder metallurgy
Process controls
Scanning electron microscopy
Solid solubility
Solid solutions
Solubility
Surfaces and Interfaces
Thin Films
Transmission electron microscopy
Tribology
X-ray diffraction
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Summary:In the present work, mechanical alloying of a powder mixture of nickel and graphite (up to 15wt%) was carried out in an attrition mill under a nitrogen atmosphere. The as-milled powders were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The 15wt% graphite dissolved into the nickel (exceeding the negligible solid solubility in the nickel-carbon system), thereby forming a supersaturated solid solution of graphite in a nickel matrix. The dissolved graphite occupied interstitial positions along the dislocation edges and at the grain-boundary regions. A three-step graphite dissolution mechanism has been proposed. The associated changes in the nickel lattice, such as changes in the crystallite size (62 to 43 nm), lattice strain (0.12% to 0.3%), and lattice parameter (0.3533 to 0.3586 nm), which led to the formation of the supersaturated solid solution, were also evaluated and discussed.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-019-1816-7