Ultrafine-grained materials processed from nanopowders: Microstructures and mechanical properties

Dirras, G. F. and Gubicza, Jenő and Bui, H. Q. (2008) Ultrafine-grained materials processed from nanopowders: Microstructures and mechanical properties. In: Proceedings of 18th DYMAT Technical Meeting. Fraunhofer IRB Verlag, Freiburg; Munchen, pp. 25-32. ISBN 2-9517947-3-8

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Abstract

Bulk ultrafine-grained materials (Al, Fe, Ni) have been processed either by Hot Isostatic Pressing (HIP), Spark Plasma Sintering (SPS) or combined HIP and dynamic severe plastic deformation (DSPD). The resulting microstructures (grain/crystallite sizes, grain size distribution, crystallographic texture, defects) depend on the processing route and are characterised by means of X-ray diffraction line profile analysis and transmission electron microscopy. The influence of the microstructure on the mechanical behaviour is studied by quasi-static compression test at room temperature. The observed macroscopic behaviour especially the flow softening during the quasi-static compression tests is discussed in relation with the initial microstructure and its evolution during straining.

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