Title: Grain subdivision of a Nb polycrystal deformed by successive compression tests
Authors: Zhu, Liang
Sandim, Hugo R.Z.
Seefeldt, Marc
Verlinden, Bert
Issue Date: 2011
Publisher: Trans Tech Publications
Host Document: Materials Science Forum vol:667-669 pages:373-378
Conference: International 7Conference on Nanomaterials by Severe Plastic Deformation edition:5 location:Nanjing University Science & Technology, Nanjing, China date:21-25 March 2011
Abstract: To understand and model grain refinement in severe plastic deformation, some analysis of Nb single crystals has been carried out in previous work. To bridge the gap with normal polycrystalline materials, supplementary experiments on large polycrystals, deformed at moderate strains appear to be necessary to explain the grain subdivision step by step. In the present work, successive uniaxial compression tests have been carried out on a large grained Niobium polycrystal
up to height reductions of 30% with small strain increments. Electron backscatter diffraction (EBSD) analysis was done after each compression step to characterize the evolution of orientation and microstructures. It is observed that a “rotation front” forms inside the grain and moves with increasing strain from one side to the other side of the grain. In one grain, this process results in a grain boundary affected zone in the vicinity of the grain boundary. Both static orientation evolution inside the grain
and historical evolution of the average orientation have been studied, which indicates that the grain orientation rotates around one of the (110) poles at low strain.
ISSN: 0255-5476
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
Department of Materials Engineering - miscellaneous
Mechanical Metallurgy Section (-)

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