O n the surface of iron deposited from a ferrous sulphate solution under potentiostatic conditions tetragonal and trigonal growth pyramids are formed . At low overvoltages the tetragonal pyramids, and at high overvoltages the trigonal pyramids, prevail . The respective tangents of the angles between
On the electrocrystallization of iron
β Scribed by K.V. Gow; G.J. Hutton
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 619 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0013-4686
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β¦ Synopsis
In the course of an investigation of the structure and mechanical properties of electrodeposited iron foils about 25 Β΅m in thickness, optical micrographs of cross-sections of foils deposited over a range of current densities revealed a structure consisting of columnar grains perpendicular to the substrate and traversing almost the entire thickness of the foils . Electron transmission micrographs of thin film sections of the foils parallel to the substrate, and revealing the structure of the columnar grains in cross-section, showed that those deposited at low current densities contained many large grains, some of which had parallel rows of dislocations near the grain boundaries . The foils depos i ted at low current densities had a [112] fibre texture in the direction of columnar growth . Those deposted at high current densities had a fairly strong 1111] fibre texture and contained small columnar grains with polyhedral cross-sections, some in the form of fairly regular hexagons with grain boundaries parallel to (112) faces . Adjacent hexagonal grains were twin-related . Many of the polyhedral columnar grains contained a central cluster of defects .
Resume-Au cours d'une etude des propriβ¬tes structurales et m8caniques de feuilles de for electrodeposees a 25 jam. environ d'6paisseur, les micrographies optiques de leurs sections revdlent dans tout un domain de densit6s de courant, une structure granulaire en forme de colonises perpendiculaires au substrat et traversant presque totalement 1'epaisseur des feuilles . Les micrographies dlectroniques de transmission A travers des films minces tailles dans les feuilles parallelement au substrat, tout en rev6lant cette structure ganulaire en forme de eolormes daps une section droite, montrent que les depots obtenus aux faibles densites de courant contiennent beaucoup de grains epais, dont quelques uns presentent des lignes de dislocation paralleles, au voisinage de leurs limites granulaires . Les feuilles depos6es aux foibles densites de courant oat une texture fibreuse (112) dant la direction de leur croissance en forme de colonne . Ceux qui sent deposes aux densites de courans elev6es ont une texture fibreuse assez marquee (111) et contiennent de petits grains en forme de colonise, de sections poly6driques ; quelques uns ont une forme hexagonale assez r8gulie?re, aver des limites ganulaires paralleles aux faces (112) . Des grains hexagonaux adjacents sont oracles. Plusieurs grains polyi driques en forme de colonne manifestent un amas central de defauts .
Zusammenfassung-Im Verlauf von Unlersuchungen caber die Struktur and die mechanischen Eigenschaften von 25,u dicken elektrolytisch abgeschiedenen Eisenfolien zeigten mikroskopische Querschnittsuntersuchungen der abgeschiedenen Folien eine Struktur von saulenformigen Korncrn, welche rechtwinklig zum Substrat liegen and sich praktisch caber die gesamte Dicke der Folie erstrecken . Die elektronenmikroskopische Untersuchung von Diinnschnitten der Folie parallel nun Substrat zeigt die Struktur der saulenformigen KSrner im Querschnitt . Man sieht, dass diejenigen, welche bei niedrigen Stromdichten abgeschieden wurden, viele grosse Korner enthalten, von denen einige in der Nithe der Korngrenzen Parallelversetzungen aufweisen . Die bei niedrigen Stromdichten abgeschiedenen Folien hatten eine
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