Read e-book online Materials for Transportation Technology, Volume 1 PDF

ISBN-10: 3527301240

ISBN-13: 9783527301249

ISBN-10: 3527606025

ISBN-13: 9783527606023

Mild layout, excessive protection and luxury, and environmental compatibility are the necessities which impact using fabrics in vehicles. within the aerospace undefined, there's this day a powerful necessity to considerably decrease improvement time and prices. Rail automobiles and ships are characterised through super lengthy lifetime and excessive mileages. The fulfillment of those varied ambitions is dependent upon the supply of novel or superior fabrics and similar techniques.

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Another icosahedral structure was observed in the crept specimens. As shown by EDP, and supported by the literature [8,9], this phase was identified as τ-phase (Mg32(Al,Zn)49). 50 a) b) Figure 3. TEM image showing: a) (Al, Mg)86Mn14 quasicrystal with related EDP, b) Al8Mn5 particle with related EDP, the indices are also shown. Conclusions The microstructural investigation of the as-thixo AZ91 revealed its substantial microstructural evolution during solution treatment. The initial structure of large globules and eutectic region transformed into a microstructure of equiaxed grains after 4-6h at 415°C.

Zn. Precipitations of the γ-phase are formed on the grain boundaries of the δ-phase. Although being more noble than the δphase - and for this reason supporting galvanic corrosion - these precipitations are known to protect the δ-phase from corrosive media. The AZ91 hp for this reason is known to have the best corrosion resistance of all magnesium alloys commercially used [3, 4]. Both alloys additionally contain Mn to improve their corrosion properties. To avoid corrosion between magnesium and electrochemical noble elements, impurities of Cu, Fe and Ni are limited to noncritical concentrations.

Fuel cells for mobile and stationary applications Among these fuel cells the type working with a proton exchange membrane is the most promising system because of the combination of flexible operating, high power density and efficiency. But besides other unsolved problems, e. g. fuel storage, there is still no carbon 22 material for the use as electrodes available meeting at low costs the required combination of good electrical conductivity, dimensional stability up to 200 °C, chemical stability in hot water and acids, high purity, and diffusion resistance towards hydrogen up to 5 bar.

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Materials for Transportation Technology, Volume 1


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