Details
| Original language | English |
|---|---|
| Pages (from-to) | 659-672 |
| Number of pages | 14 |
| Journal | Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties |
| Volume | 80 |
| Issue number | 3 |
| Publication status | Published - Mar 2000 |
Abstract
The characteristic features of TiN interlayers were investigated in three different materials: firstly TiN-coated C-fibres of the high-tensile-strength type in pure Mg; secondly TiN-coated fibres in a Mg alloy containing 5wt% A1 (AM50); thirdly, for comparison, the latter alloy reinforced with the uncoated fibres. The results were obtained using high-voltage electron microscopy, highresolution electron microscopy, energy-filtered transmission electron microscopy and scanning transmission electron microscopy in combination with energy- dispersive X-ray spectroscopy and electron-energy-loss spectroscopy, including analyses of near-edge fine structures. The chemically vapour-deposited coating was proven to consist partly of a nanocrystalline titanium carbonitride (TiCxNy) rather than of titanium nitride (TiN). It varies in thickness mainly between 10 and 30 nm. In the composite with the pure Mg matrix, the interfacial structure is characterized by an almost stringent separation of matrix and fibre by the coating. A graphitic ribbon 10-15 nm thick was only rarely observed at the coating/matrix interface. Thus, the coating almost fully prevents the C transport across the fibre/matrix interface. Accordingly, changing the matrix to the Mg-Al alloy did not initiate a distinct formation of aluminium carbides. On the other hand, combining the same matrix with the uncoated fibre resulted in the substantial formation of many Al2MgC2carbides of different sizes at the fibre/matrix interface, which embrittle the composite as described in our former work. Therefore, an appropriate titanium nitride interlayer enables the applicability of Mg matrices with high contents of Al, which is of particular interest for the manufacturing of hybrid components.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Physics and Astronomy(all)
- Physics and Astronomy (miscellaneous)
- Materials Science(all)
- Metals and Alloys
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In: Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties, Vol. 80, No. 3, 03.2000, p. 659-672.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Tin coatings in C/Mg-Al composites
T2 - Microstructure, nanochemistry and function
AU - Feldhoff, Armin
AU - Pippel, Eckhard
AU - Woltersdorf, Jörg
PY - 2000/3
Y1 - 2000/3
N2 - The characteristic features of TiN interlayers were investigated in three different materials: firstly TiN-coated C-fibres of the high-tensile-strength type in pure Mg; secondly TiN-coated fibres in a Mg alloy containing 5wt% A1 (AM50); thirdly, for comparison, the latter alloy reinforced with the uncoated fibres. The results were obtained using high-voltage electron microscopy, highresolution electron microscopy, energy-filtered transmission electron microscopy and scanning transmission electron microscopy in combination with energy- dispersive X-ray spectroscopy and electron-energy-loss spectroscopy, including analyses of near-edge fine structures. The chemically vapour-deposited coating was proven to consist partly of a nanocrystalline titanium carbonitride (TiCxNy) rather than of titanium nitride (TiN). It varies in thickness mainly between 10 and 30 nm. In the composite with the pure Mg matrix, the interfacial structure is characterized by an almost stringent separation of matrix and fibre by the coating. A graphitic ribbon 10-15 nm thick was only rarely observed at the coating/matrix interface. Thus, the coating almost fully prevents the C transport across the fibre/matrix interface. Accordingly, changing the matrix to the Mg-Al alloy did not initiate a distinct formation of aluminium carbides. On the other hand, combining the same matrix with the uncoated fibre resulted in the substantial formation of many Al2MgC2carbides of different sizes at the fibre/matrix interface, which embrittle the composite as described in our former work. Therefore, an appropriate titanium nitride interlayer enables the applicability of Mg matrices with high contents of Al, which is of particular interest for the manufacturing of hybrid components.
AB - The characteristic features of TiN interlayers were investigated in three different materials: firstly TiN-coated C-fibres of the high-tensile-strength type in pure Mg; secondly TiN-coated fibres in a Mg alloy containing 5wt% A1 (AM50); thirdly, for comparison, the latter alloy reinforced with the uncoated fibres. The results were obtained using high-voltage electron microscopy, highresolution electron microscopy, energy-filtered transmission electron microscopy and scanning transmission electron microscopy in combination with energy- dispersive X-ray spectroscopy and electron-energy-loss spectroscopy, including analyses of near-edge fine structures. The chemically vapour-deposited coating was proven to consist partly of a nanocrystalline titanium carbonitride (TiCxNy) rather than of titanium nitride (TiN). It varies in thickness mainly between 10 and 30 nm. In the composite with the pure Mg matrix, the interfacial structure is characterized by an almost stringent separation of matrix and fibre by the coating. A graphitic ribbon 10-15 nm thick was only rarely observed at the coating/matrix interface. Thus, the coating almost fully prevents the C transport across the fibre/matrix interface. Accordingly, changing the matrix to the Mg-Al alloy did not initiate a distinct formation of aluminium carbides. On the other hand, combining the same matrix with the uncoated fibre resulted in the substantial formation of many Al2MgC2carbides of different sizes at the fibre/matrix interface, which embrittle the composite as described in our former work. Therefore, an appropriate titanium nitride interlayer enables the applicability of Mg matrices with high contents of Al, which is of particular interest for the manufacturing of hybrid components.
UR - http://www.scopus.com/inward/record.url?scp=0034161063&partnerID=8YFLogxK
U2 - 10.1080/01418610008212074
DO - 10.1080/01418610008212074
M3 - Article
AN - SCOPUS:0034161063
VL - 80
SP - 659
EP - 672
JO - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
JF - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
SN - 0141-8610
IS - 3
ER -