<b>Phase identification in composite materials by EELS fine‐structure analysis</b>

Schneider, Reinhard; Woltersdorf, J.; Lichtenberger, O.

doi:10.1046/j.1365-2818.1996.73073.x

Cited by 16 publications

(13 citation statements)

References 12 publications

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“…Electron energy loss spectroscopy (EELS) is also useful in performing such examinations, since it allows the bonding states of chemical elements at interfaces to be determined on a nanometre scale by analysing the near edge ®ne structure (ELNES) of an EELS spectrum [7,24,28,29,36,37]. Moreover, quantitative volumetric measurements (sorption and desorption of oxygen) [25] and a special electrochemical technique applicable to the matrix metal palladium (high hydrogen permeability) have been employed [25± 27].…”

Section: Introductionmentioning

confidence: 99%

Evidence of oxygen segregation at Ag/MgO interfaces

Pippel

Woltersdorf

Gegner³

et al. 2000

Acta Materialia

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AbstractÐThe distribution and microstructure of MgO precipitates formed by internal oxidation of Ag/ 3 at.% Mg alloys have been investigated by high voltage (HVEM) and high resolution electron microscopy (HREM). The chemical composition of their phase boundaries was studied at an atomic level by electron energy loss (EELS) ®ne structure analyses especially at the ionization edges (ELNES). In specimens annealed in vacuum T 1163 K, total pressure about 10 À3 Pa), oxygen occurs at the interface only, bound as MgO. However, if the samples are annealed in oxygen T 673 K, partial pressure 10 5 Pa), the spatially resolved ®ne structure of the energy loss O±K edge reveals an additional interface bonding part, representing an Ag 2 O-like bonding state. Thus, with high oxygen activities, the interface layer between magnesia and silver consists of oxygen atoms bound partly as MgO and as Ag 2 O. This segregation of excess oxygen at the Ag/MgO interfaces ®ts into the framework of a general structural model, which should be applicable to many metal/oxide phase boundaries. 7

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Section: Introductionmentioning

confidence: 99%

Evidence of oxygen segregation at Ag/MgO interfaces

Pippel

Woltersdorf

Gegner³

et al. 2000

Acta Materialia

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“…Because of the strong similarities in the Al±L 23 and C±K ELNES (Figs. 3b and 3c), these ELNES peculiarities suggest the precipitate phase to be considered as an aluminum±magnesium-carbide, the crystal chemistry of which is closely related to that of the binary carbide Al 4 C 3 .…”

Section: Introductionmentioning

confidence: 99%

Interface Engineering of Carbon-Fiber Reinforced Mg-Al Alloys

Feldhoff

Pippel

Wolterdorf³

2000

Adv. Eng. Mater.

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REVIEWSMetal matrix composites of the system C-fiber/Mg-matrix enable the outstanding combination of the high strength and elastic modulus of carbon fibers and the low density of both the carbon fiber and the magnesium matrix in structural metallic materials. However, the efficiency of the fiber reinforcement depends mainly on the characteristics of the fiber/matrix interlayers. Optimized materials can be achieved only by an appropriate interface design. The interfacial bonding can be adjusted by modifications of both the matrix composition and the fiber surface. Two strategies are reviewed in this paper: Firstly, to control the fiber/matrix reactivity by appropriate chemical and structural properties of the partners. Secondly, to coat the carbon fibers with a suitable material prior to the composite fabrication.

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“…In order to study the interface microstructure and the nature of the bonds between the brazing alloys and the SiC f /SiC composites, investigations were performed by transmission electron microscopy (TEM) and electron energy-loss spectroscopy (EELS) for chemical analysis (cf., e.g., [15,16]). The EELS method allowed an estimation of the kind and concentration of the chemical elements with a spatial resolution in the order of 1-2 nm.…”

Section: Microstructure and Nanochemistrymentioning

confidence: 99%