Download Advanced Aerospace Materials by W. J. G. Bunk (auth.), Dr. Horst Buhl (eds.) PDF

By W. J. G. Bunk (auth.), Dr. Horst Buhl (eds.)

Very mild, very robust. tremendous trustworthy -aircraft and aerospace engineers are. and feature to be. very challenging companions within the fabrics group. the result of their learn and improvement paintings is not just an important for one certain quarter of purposes. yet may also cleared the path to new ideas in lots of different components of complex know-how. Springer-Verlag and the undersigned editor are happy to offer during this quantity. an outline of the various elements of fabrics technological know-how and expertise which were the target of in depth and systematic study paintings in the course of prior a long time within the laboratories of the German Aerospace study institution. Its contents exhibits sincerely the interrelations among pursuits outlined by means of the person. basics supplied via the scientists and potential recommendations constructed via the sensible engineer. the actual personalized touch which has been given to this quantity by way of its authors in dedicating it as a farewell current to Professor Wolfgang Bunk. inspiring sci­ entist and director of the DLR Intitute of fabrics study for greater than two decades. has evidently given an additional worth to this crucial e-book. without doubt. this actually cooperative endeavour will render a necessary carrier to a wide interna­ tional neighborhood of readers. lots of them having own hyperlinks to the Institute. its director and its staff.

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03 2 , I. Alternate Immersion 50 OCID • •I 20 500 I 250 a.. 5% NaCI solution. Tensile specimens were strained in ST direction. The arrows indicate the upper and lower scale, respectively [79]. 5% NaCI solution give reliable predictions for AI-Li alloys in natural environments. 5% NaCl solution. 2% proof stress), the short transverse see resistance is very low. With 8090-T651 and 2091-T8X51 plate threshold stresses below 50 MPa are found in alternate immersion tests in ST direction [78, 79]. 7).

Metallic Materials and Metal Matrix Composites 42 10-3'r --------------------------------------------. 1 u C7 ......... ~ 10-5 R=O,7 Z "0 ......... 5 Fatigue crack growth curves of 8090-T651, 2024-T351 and 2024-T851 tested in laboratory air (LT orientation) [74] Corrosion Behaviour Similarly to other aluminium alloys used in aircraft applications the corrosion behaviour of AI-Li alloys depends upon grain structure, heat treatment and alloy composition. As found in the limited number of outdoor exposure tests, the corrosion performance of Al-Li alloys is equal or better than that of conventional alloys to be replaced.

6 mm thick sheet of lithium-bearing and conventional aluminium alloys [24,40, 57-59] Test direction YS MPa UTS MPa EI. e. perpendicular to the pancake shaped grains of wrought products. With in-plane test directions intergranular delamination and ductile shear fracture are observed, too. 1 Metallic Materials 39 Several mechanisms were taken into considerations to promote grain boundary failure including: (a) planar slip giving rise to stress concentrations at grain boundaries, (b) strain localization in precipitate-free zones, (c) embrittlement caused by precipitation of constituent particles and equilibrium phases such as T2 and 0 at grain boundaries, (d) embrittlement due to segregation of impurity elements like Na, K, Ca, and the alloying element Li to grain boundaries [61].

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