Nanostructured Materials, Volume 1 - download pdf or read online

By Gerhard Wilde

ISBN-10: 0080449654

ISBN-13: 9780080449654

This ebook makes a speciality of useful elements of nanostructured fabrics that experience a excessive relevance to instant purposes, akin to catalysis, strength harvesting, strength garage, optical homes and floor functionalization through self-assembly. also, there are chapters dedicated to immense nanostructured fabrics and composites and masking uncomplicated houses and specifications of this new category of engineering fabrics. in particular the problems touching on balance, reliability and mechanical functionality are needed points that must be seemed conscientiously for any nanostructured engineering fabric.

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Extra resources for Nanostructured Materials, Volume 1

Example text

17wt% Zr alloy was investigated [139]. 17wt% Zr alloy deformed by ECAP [139] (circles) in comparison to the Ni diffusivity in high-purity coarse-grained Cu [108] (squares). The diffusivities of ‘slow’ (open circles) and ‘fast’ (full circles) short-circuit diffusion paths in UFG Cu alloy are shown. alloy in the range of temperatures and annealing times suitable for GB diffusion measurements. 17wt% Zr alloy: while the majority of GBs exhibit the diffusivities which are very close to those of HAGBs in high purity coarse-grained copper, there is a fraction of GBs which exhibit unusually high diffusivities.

Intergranular melting of the UFG Nd2Fe14B alloy was also observed [112]. Similar results were established for Mo tracer diffusion in an Fe76Mo8Cu1B15 alloy which was studied using a serial sectioning method in the temperature range 548 to 648 K [113]. 3 Electrodeposition D (m2/s) By electrodeposition, sheets with a thickness of 100 μm or more with minimum average grain sizes of about 10 to 40 nm can be produced [114]. However, the use of additives, such as saccharin, in the plating bath often results in carbon and sulphur as impurities in the materials that often are found to be segregated at the grain boundaries and strongly affect GB diffusion.

Experiments in the C kinetics regime on typical coarse-grained materials require a very high sensitivity of the radionuclide counting system, since tiny amounts of tracer have to be detected in each section of the GB diffusion profile. On the other hand, higher temperatures, which are required for the B-type measurements, invoke almost inevitably GB motion and recrystallization in a nanomaterial. This demands certain precautions by comparing the GB diffusion data measured in a nanomaterial and its coarse-grained counterpart.

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Nanostructured Materials, Volume 1 by Gerhard Wilde

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