Formation of spherulites and pentagonal quasicrystals in metals being electrodeposited

Girin, O. B.; Овчаренко, Владимир Иванович

doi:10.15587/1729-4061.2014.21860

Cited by 2 publications

(10 citation statements)

References 15 publications

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“…2b). 79,80 The presence of a variety of spherulite and pentagonal quasicrystal forms clearly seen in metal layers next to the substrate supports the concept advanced above, i.e. that the electrochemical phase formation in metals involves occurrence of a deeply supercooled metallic liquid and its ultrarapid solidification.…”

Section: First Principal Hypothesissupporting

confidence: 65%

“…A general feature of the quasicrystalline structure elements revealed in the electrodeposited layers was that the crystal aggregates had a radially diverging arrangement, each having a common center. 79 Also found in metal layers next to the cathode were quasicrystals with five-fold symmetry prohibited by the classical crystallography (Fig. 2b).…”

Section: First Principal Hypothesismentioning

confidence: 96%

“…77,78 Consequently, if metals indeed pass a supercooled liquid state stage in electrodeposition and solidify rapidly at the deposition temperature, then spherulites and pentagonal quasicrystals must be identified in the deposit layers next to the cathode. 62,79,80 Occurrence of such elements of a quasicrystalline structure in metal electrodeposit layers next to the cathode will be an argument for the phenomenon in point. 79,80 To check if the above idea holds, electrodeposit layers next to the cathode were investigated for copper, lead and cobalt.…”

Section: First Principal Hypothesismentioning

confidence: 99%

“…62,79,80 Occurrence of such elements of a quasicrystalline structure in metal electrodeposit layers next to the cathode will be an argument for the phenomenon in point. 79,80 To check if the above idea holds, electrodeposit layers next to the cathode were investigated for copper, lead and cobalt. Electrodeposits were obtained at temperature 25 °C while current density was varied from 0.4 to 0.6 A dm −2 for copper, from 0.8 to 1.0 A dm −2 for lead and from 0.1 to 0.3 A dm −2 for cobalt.…”

Section: First Principal Hypothesismentioning

confidence: 99%

“…2a). 79 Faceted pyramid crystals radiating from a common center were thus found in copper. In lead, the spherulites consisted of radial plates whereas in cobalt they displayed a rosette form (Fig.…”

Section: First Principal Hypothesismentioning

confidence: 99%

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Review—Electrochemical Phase Formation via a Supercooled Liquid State Stage: Metastable Structures and Intermediate Phases

Girin

2022

J. Electrochem. Soc.

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A review of experimental works proving the existence of the phenomenon of the electrochemical phase formation in metals and alloys via a supercooled liquid state stage is presented. The research findings focused on the electrochemical formation of metastable structures and intermediate phases, as well as on the structural features accompanying them. Electrochemical amorphous phase formation in metals and alloys, electrochemical quasicrystalline phase formation in metals, and electrochemical polymorphic phase formation in metals are discussed. Electrochemical hydrogen-related structure formation in metals, electrochemical high-defect crystalline phase formation in metals, and electrochemical texture-inhomogeneous structure formation in metals are considered. Electrochemical formation of intermediate phases in metals and alloys, electrochemical formation of eutectics in metallic alloys, and electrochemical formation of chemical compounds at the metallic cathode/electrodepositing metal interface are analyzed. Electrochemical reduction of ions in metals and alloys at a liquid cathode versus a solid chemically identical one, electrochemical phase formation of metals at chemically identical solid or liquid cathode, and electrochemical phase formation of alloys at chemically identical solid or liquid cathode are discussed.

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Section: First Principal Hypothesissupporting

confidence: 65%

Section: First Principal Hypothesismentioning

confidence: 96%

Section: First Principal Hypothesismentioning

confidence: 99%

Section: First Principal Hypothesismentioning

confidence: 99%

Section: First Principal Hypothesismentioning

confidence: 99%

See 3 more Smart Citations

Review—Electrochemical Phase Formation via a Supercooled Liquid State Stage: Metastable Structures and Intermediate Phases

Girin

2022

J. Electrochem. Soc.

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Structural Features of Electrodeposited Metals as a Result of Ultra-Rapid Solidification of a Highly Supercooled Liquid Metal Phase

Girin¹

2015

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With a view to validating the existence of the phenomenon of phase formation via a liquid state stage in metals being electrodeposited, experiments were carried out to reveal electrodeposited metal's structural features typical of metals produced by solidification at ultra-high rates under high supercooling, and to establish consistent changes in metal structural characteristics with increasing degree of supercooling in electrodeposition. Following experimental facts in favour of the existence of the phenomenon in point were found: (1) occurrence of spherulites and pentagonal quasicrystals in electrodeposit layers adjoining the cathode, the occurrence being typical of metals produced by ultra-rapid solidification of a highly supercooled liquid metal phase; (2) emergence of the electrodeposited metals solely in a spherulitic form when transition of spherulitic growth to drusy growth with increasing deposit thickness was prevented; and (3) regular change in characteristics of point, linear and planar defects in the crystalline lattice with increasing degree of supercooling in electrodeposition of metals.

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Formation of spherulites and pentagonal quasicrystals in metals being electrodeposited

Cited by 2 publications

References 15 publications

Review—Electrochemical Phase Formation via a Supercooled Liquid State Stage: Metastable Structures and Intermediate Phases

Review—Electrochemical Phase Formation via a Supercooled Liquid State Stage: Metastable Structures and Intermediate Phases

Structural Features of Electrodeposited Metals as a Result of Ultra-Rapid Solidification of a Highly Supercooled Liquid Metal Phase

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