Nanostructured Ni-Co alloys with tailorable grain size and twin density

Wu, Bo; Ferreira, Paulo J.; Schuh, Christopher A.

doi:10.1007/s11661-005-0056-9

Cited by 81 publications

(31 citation statements)

References 62 publications

(88 reference statements)

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“…4b. Similar pyramidal morphology was also observed for Co-rich Ni-Co films in earlier study [24]. Consequently, the surface morphology of the electrodeposited Ni-Co thin films gradually changes from a structure with roundedshaped grains into a structure with pyramidal-shaped grains and also the grain size increases as the Co ion concentration within the electrolyte increases, consequently the Co content within the films as summarized in Table 1.…”

Section: Resultssupporting

confidence: 83%

Differences Observed in the Phase Structure, Grain Size–Shape, and Coercivity Field of Electrochemically Deposited Ni–Co Thin Films with Different Co Contents

Saraç

Baykul

Uguz

2015

J Supercond Nov Magn

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Nanostructured Ni-Co thin films were produced using galvanostatic electrodeposition on indium tin oxide (ITO)-coated glass substrates from an aqueous electrolyte solution without stirring at ambient temperature. Different compositions of the films were achieved depending on the Co ion concentration within the electrolyte. From the compositional analysis performed using energy dispersive X-ray (EDX) spectroscopy, the anomalous codeposition was found for all films and an increase in the Co content of the films was observed with increasing Co ion concentration within the electrolyte. The X-ray diffraction (XRD) analyses revealed that the phase structure of the electrodeposited Ni-Co thin films changes from single face-centered cubic (FCC) to a mixture of FCC and hexagonal closepacked (HCP) with the Co content within the films. It was also observed that the mean crystallite size estimated by applying the Scherrer method gradually decreases as the Co content within the films increases. The scanning electron microscopy (SEM) employed for the surface morphology showed that the size and shape of the grains formed on the film surface are strongly dependent on Co content within the films. Magnetic measurements performed by vibrating sample magnetometer (VSM) revealed that the films with different Co contents exhibit different magnetic properties;

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Section: Resultssupporting

confidence: 83%

Differences Observed in the Phase Structure, Grain Size–Shape, and Coercivity Field of Electrochemically Deposited Ni–Co Thin Films with Different Co Contents

Saraç

Baykul

Uguz

2015

J Supercond Nov Magn

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“…The grain size gradually Effect of Annealing on Mechanical Properties and Nanoscale Lamellar Structure in Co-Cu Alloyincreased with annealing temperature up to 773 K, and then it rapidly increased from 773 to 873 K. This trend was independent of the addition of saccharin. Wu et al 26) showed that grain refinement was enhanced for Ni-Co alloy by the addition of saccharin. In the present work, however, the addition of saccharin addition did not necessarily induce grain refinement of the Co-Cu alloy.…”

Section: Resultsmentioning

confidence: 99%

Effect of Annealing on Mechanical Properties and Nanoscale Lamellar Structure in Co-Cu Alloy

et al. 2009

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An electrodeposited Co-Cu alloy with a nanoscale lamellar structure was annealed at 673-973 K. The effects of annealing on the mechanical properties and the microstructures of the alloy such as the lamellar area ratio and the lamellar spacing were investigated. The Young's modulus of the Co-Cu alloy increased by annealing. This is mainly due to a decrease in the lamellar area ratio. The as-deposited specimens exhibited a low value of the activation volume for plastic deformation; however, the activation volume was increased by annealing. This appears to be related to an increase in lamellar spacing caused by annealing. The origins of the lamellar spacing dependence of the activation volume are discussed from the viewpoint of the emission of dislocations from the lamellar boundary.

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“…[34][35][36][37][38][39] The deposition parameters, such as solution composition, current density, and bath movement, strongly influence the developing microstructure. The exact mechanisms of microstructure formation are still largely unknown, in part because a precise characterization of the microstructure has rarely been undertaken.…”

Section: B ''Nanocrystalline'' Nico Depositsmentioning

confidence: 99%

Three-Dimensional Orientation Microscopy in a Focused Ion Beam–Scanning Electron Microscope: A New Dimension of Microstructure Characterization

Zaefferer

Wright

Raabe

2008

Metall Mater Trans A

210

113

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In the present work, we report our recent progress in the development, optimization, and application of a technique for the three-dimensional (3-D) high-resolution characterization of crystalline microstructures. The technique is based on automated serial sectioning using a focused ion beam (FIB) and characterization of the sections by orientation microscopy based on electron backscatter diffraction (EBSD) in a combined FIB-scanning electron microscope (SEM). On our system, consisting of a Zeiss-Crossbeam FIB-SEM and an EDAX-TSL EBSD system, the technique currently reaches a spatial resolution of 100 · 100 · 100 nm 3 as a standard, but a resolution of 50 · 50 · 50 nm 3 seems to be a realistic optimum. The maximum observable volume is on the order of 50 · 50 · 50 lm 3 . The technique extends all the powerful features of two-dimensional (2-D) EBSD-based orientation microscopy into the third dimension of space. This allows new parameters of the microstructure to be obtained-for example, the full crystallographic characterization of all kinds of interfaces, including the morphology and the crystallographic indices of the interface planes. The technique is illustrated by four examples, including the characterization of pearlite colonies in a carbon steel, of twins in pseudonanocrystalline NiCo thin films, the description of deformation patterns formed under nanoindents in copper single crystals, and the characterization of fatigue cracks in an aluminum alloy. In view of these examples, we discuss the possibilities and limits of the technique. Furthermore, we give an extensive overview of parallel developments of 3-D orientation microscopy (with a focus on the EBSD-based techniques) in other groups.

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Nanostructured Ni-Co alloys with tailorable grain size and twin density

Cited by 81 publications

References 62 publications

Differences Observed in the Phase Structure, Grain Size–Shape, and Coercivity Field of Electrochemically Deposited Ni–Co Thin Films with Different Co Contents

Differences Observed in the Phase Structure, Grain Size–Shape, and Coercivity Field of Electrochemically Deposited Ni–Co Thin Films with Different Co Contents

Effect of Annealing on Mechanical Properties and Nanoscale Lamellar Structure in Co-Cu Alloy

Three-Dimensional Orientation Microscopy in a Focused Ion Beam–Scanning Electron Microscope: A New Dimension of Microstructure Characterization

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