Electrochemical Phase Formation of Metals and Alloys at Chemically Identical Solid or Liquid Cathode: Part 3. Alloys in
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lectrochemical Phase Formation of Metals and Alloys at Chemically Identical Solid or Liquid Cathode: Part 3. Alloys in the Form of Intermetallic Compounds O. B. Girina, * and D. G. Korolyanchuka a
Department of Materials Science, Ukrainian State University of Chemical Technology, Dnipro, 49005 Ukraine *e-mail: [email protected] Received June 12, 2019; revised July 12, 2019; accepted July 12, 2019
Abstract—In order to provide further evidence on the existence of the phenomenon of electro-chemical phase formation in metals and alloys via a supercooled liquid state stage, a set of experiments were carried out to reveal the predicted structural features in alloys during electrochemical phase formation at chemically identical solid or liquid cathode. In the third part of the research, the results of the precision X-ray phase analysis for the interface between an electrodepositing alloy in the form of intermetallic compounds and a cathode of Wood’s alloy that persisted in either a solid or a liquid condition are discussed. The phenomenon in question was proved by the following experimental results: (1) alloys electrodepositing as intermetallic compounds at a solid metallic cathode showed formation of intermetallics involving components of the depositing alloy and, in parallel, cathode elements and alloy components; (2) on replacing a solid cathode with a chemically identical liquid one for alloys electrodepositing as intermetallic compounds, occurrence of additional intermetallics enriched in the major alloy component and cathode elements was observed. Keywords: electrochemical phase formation, electrodepositing alloy, liquid state, intermetallic, liquid cathode DOI: 10.3103/S1068375520040067
INTRODUCTION In the first two parts of the study already published, a set of experiments revealed the predicted structural features in metals and alloys in the form of a substitutional solid solution during electrochemical phase formation at a chemically identical solid or liquid cathode [1]. Relying on the data obtained, it was concluded that the phenomenon of electrochemical phase formation in metals and alloys via supercooled liquid state stage is proved by the following experimental results: (1) enhanced formation of intermetallic compounds involving metallic cathode elements and the electrodepositing metal plus additional intermetallics enriched in cathode elements, on replacing a solid cathode with a chemically identical liquid one; (2) formation of intermetallics between solid metallic cathode elements and the solvent in the alloy electrodepositing as substitution solid solution, and enhancement of these processes accompanied by development of additional intermetallics enriched in cathode elements on replacing a solid cathode with a chemically identical liquid one; (3) formation of intermetallics including cathode elements and the alloy solute element without any dis-
tinct phase when alloys are electrodepositing as substitution solid solution at a solid metallic cathode; (4) enhanced intermetallic formation involving metallic ca
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