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Nanostructured Ni3Al intermetallic alloy processed by severe rolling at liquid nitrogen temperature and annealing


Military University of Technology (WAT), Kaliskiego 2, Warszawa 00-908, Poland


Refining grain size to the nanocrystalline level has been suggested as a way of improving strength while enhancing ductility and toughness. However, there is a serious problem with production of fully-dense bulk nanostructured materials. Conventional methods of powder consolidation cannot be employed for nanophase materials, because they involve high temperature (at least 0.6Tm, Tm is the melting temperature) for extended times.
The present work is a comprehensive overview of our efforts to produce of nanostructured bulk Ni3Al intermetallic alloy by rolling at liquid nitrogen temperature to a high value of percentage cold work and subsequent annealing. This thermomechanical treatment results in a bimodal grain size distribution, with micrometre-sized grains embedded inside a matrix of nanocrystalline and ultrafine grains. Changes of microstructure during processing and mechanical properties of nanostructured bulk intermetallics are shown and discussed.


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Presentation: poster at E-MRS Fall Meeting 2003, Symposium G, by JERZY BYSTRZYCKI
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-13 09:21
Revised:   2009-06-08 12:55