Sintered AlN ceramics were implanted by Ti, Fe and Cu ions up to 1.9 × 10^{17} atoms/cm^{2} at mean energies of 70-110 keV in order to investigate the role of the chemical properties of the implanted species. on the phase formed during the implantation process. X-ray absorption studies were performed at room and at liquid nitrogen temperature to give information on the resulting systems and local environments of the Ti, Fe and Cu atoms. We observe the formation of TiN even for as-implanted samples, while the Cu ions aggregate to clusters. The Fe implanted samples show an intermediate behavior with both nitride formation and Fe clustering. In conclusion, the heat of formation is found to be a key parameter for the final system.
The mechanical functions of the fibre/matrix interlayer as well as its quantitative parameter dependencies and their influence on the properties of the composite system are discussed, with the theoretical model being considered under realistic conditions. Corresponding to that a number of interface structure phenomena of some advanced composite materials, revealed by high voltage and high resolution electron microscopy, are discussed with respect to their relevance to the control of composite properties, including complex interlayer systems, which are produced by fibre coating as well as by chemical solid state transport and exchange reactions. The effects of hooking-together, binding, internal microcracking, and sublayer formation are demonstrated, and in some cases correlated with the mechanical behaviour of the materials as revealed by in situ tensile tests.
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