Paper Title:

Orientation Dependence of the Substructure Characteristics in a Ni-30%Fe Austenitic Alloy Deformed in Hot Torsion

Periodical Materials Science Forum (Volume 753)
Main Theme Recrystallization and Grain Growth V
Chapter Chapter 2: Deformation Structures
Edited by Matthew Barnett
Pages 54-57
DOI 10.4028/www.scientific.net/MSF.753.54
Citation Pavel Cizek et al., 2013, Materials Science Forum, 753, 54
Online since March, 2013
Authors Pavel Cizek, Hossein Beladi, Adam S. Taylor, Peter D. Hodgson
Keywords Crystallographic Texture, Deformation Microstructure, Dislocation Boundaries, Hot Torsion, Microbands, Ni-30%Fe Austenitic Alloy
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The present work examines the microstructure and texture evolution in a Ni-30wt.%Fe austenitic model alloy deformed in torsion at 1000 °C, with a particular emphasis on the orientation dependence of the substructure characteristics within the deformed original grains. Texture of these grains was principally consistent with that expected for simple shear and comprised the main A, B and C components. The deformation substructure within the main texture component grains was characterised by “organised” arrays of parallel microbands with systematically alternating misorientations, locally accompanied by micro-shear bands within the C grains. With increasing strain, the mean subgrain size gradually decreased and the mean misorientation angle concurrently increased towards the saturation. The stored deformation energy within the main texture component grains was principally consistent with the respective Taylor factor values. The microband boundaries corresponded to the expected single slip {111} plane for the A oriented grains while these boundaries for the C oriented grains represented a variety of planes even for a single grain.

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