EPMA of spinodal-like decomposition patterns in (TixNb1 ?x)N

Wollein, B.; Buscaglia, Vincenzo; Lengauer, W.; Bohn, Marcel; Musenich, R.; Ettmayer, Peter

doi:10.1002/1096-9918(200008)30:1<368::aid-sia810>3.0.co;2-b

Cited by 4 publications

(1 citation statement)

References 4 publications

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“…Further evidence on the relevance of alloying elements comes from Nb in TiN alloys or multilayers (TiNbN), which present an improved corrosion resistance and lower coefficient of friction, rendering them applicable even to biomedical industry . Similar impact is seen in the Mo‐doped TiN coatings, having lower wear rate than the TiN coatings owing to the formation of solid lubricant MoO 3 on surface .…”

Section: Introductionmentioning

confidence: 99%

Adhesion, atomic structure, and bonding variation at TiN/VN interface by chemical segregation

Yin

Peng

Qin

et al. 2012

Surface & Interface Analysis

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Introduction of alloying elements often alters properties of materials. In the technologically significant multilayered superlattice coatings, interfaces are known to play a key role in the deformation mechanisms, especially in the phenomenon of interfaceinduced superhardness at nanoscale. Here, we elucidate, by first-principles calculations, atomic structure of TiN/VN interface and its relationship to adhesion upon introducing Cr, Mo, Ta, Y, Al, Nb, Zr, and Sc, the very commonly occurring alloying elements in the coating. We find that the elements Cr, Mo, Ta, Y weaken substantially interfacial adhesion, whereas the others modify adhesion only slightly. The bond length, charge transfer, and interactions between atoms at interface are found to be the key factors to understanding the origin of shift in properties in the coatings with the chemical alloying. Using several methods of analysis, we have clarified electronic mechanism behind the variation induced by alloying elements and determined the interfacial bonding nature to be mainly ionic with a certain degree of covalency. The theoretical calculations presented provide insight into the complex electronic properties of the TiN/VN interfaces with alloying elements. Our findings help enhance performances of the multilayered coatings for wide-ranging applications.

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Section: Introductionmentioning

confidence: 99%

Adhesion, atomic structure, and bonding variation at TiN/VN interface by chemical segregation

Yin

Peng

Qin

et al. 2012

Surface & Interface Analysis

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X‐ray mapping of microstructures in hardmetals and cermets

Wollein

Bohn

Lengauer

2002

Surface & Interface Analysis

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Hardmetals and cermets are alloys with a complicated microstructure of hard-phase constituents such as WC, TiC, TiN,. . . and its combinations. A variety of microstructural constituents can form in these alloys, which define their performance to a large extent. Some hard-phase particles occur in a core-and-rim type structure in which the element concentration differs substantially between the core and the rim. In order to investigate the microstructural features of hardmetals and cermets in detail, model alloys in the form of diffusion couples were prepared. X-ray investigations using state-of-the-art wavelength-dispersive x-ray mapping procedures implemented on a Cameca SX 50 microprobe were performed for all the elements, both light and heavy, occurring in these alloys. Line coincidences were treated by comparison with chemically analysed standards and by subtracting interfering radiations.After 1008 h, W-rich rims were found around Ti-rich cores inside the Ti(C,N) phase of the Ti(C,N)/(Ti,W)C diffusion couple. The thickness of these rims did not change with time. When W was substituted by Mo it was observed that the well-known core-rim structure is built by diffusion of Mo into the Ti(C,N) grains. But with time the Mo diffuses into the core of the Ti(C,N) phase and homogenizes, showing that the core-rim structure is not stable.

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A first-principles study of structure, elasticity and thermal decomposition of Ti1−xTMxN alloys (TM=Y, Zr, Nb, Hf, and Ta)

Wang

Shang

et al. 2015

Surface and Coatings Technology

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EPMA of spinodal-like decomposition patterns in (TixNb1 ?x)N

Cited by 4 publications

References 4 publications

Adhesion, atomic structure, and bonding variation at TiN/VN interface by chemical segregation

Adhesion, atomic structure, and bonding variation at TiN/VN interface by chemical segregation

X‐ray mapping of microstructures in hardmetals and cermets

A first-principles study of structure, elasticity and thermal decomposition of Ti1−xTMxN alloys (TM=Y, Zr, Nb, Hf, and Ta)

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