Comparison of Single Crystalline and Polycrystalline Behavior under High Pressure Torsion

Martin Hafok; Reinhard Pippan

doi:10.4028/www.scientific.net/MSF.550.277

Paper Titles

General Principles of Substructure Inhomogeneity, Arising in Metal Materials under Plastic Deformation
p.253

TEM Investigation of Dislocations in Hot Deformed Mg-Al-Zn Alloy
p.259

Microstructure and Microtexture Evolution of a TRIP-Assisted Steel after Small Deformation Studied by EBSD Technique
p.265

Stimulated Grain Refinement in Ni-Fe Alloy by Coarse Particles during Warm Multi-Directional Forging
p.271

Comparison of Single Crystalline and Polycrystalline Behavior under High Pressure Torsion
p.277

Effect of Low Temperature Rolling on Microstructure and Properties of ECAE Processed Copper
p.283

Deformation and Heat Treatment of Cold Drawn Gold
p.289

Characterization of Boundary Misorientations in a Superplastic Al-Alloy Hot-Deformed by ECAE
p.295

Ultra-Fine Grained High Carbon Steel by Innovative Deformation
p.301

HomeMaterials Science ForumMaterials Science Forum Vol. 550Comparison of Single Crystalline and...

Comparison of Single Crystalline and Polycrystalline Behavior under High Pressure Torsion

Abstract:

By using techniques of severe plastic deformation a metallic material can be subjected to an enormous strain that is not achievable by conventional methods of deformation. In this study nickel single crystals with different crystallographic orientation and nickel polycrystals were deformed by high pressure torsion. All nickel samples were processed up to the evolution of a saturation microstructure where no further hardening of the material can be observed. In this region all samples develop a similar microstructure and micro-texture. The differences in the fragmentation of the microstructure and the micro-texture development between the single crystals and the polycrystalline aggregate were examined using EBSD. A major difference between single crystals and polycrystals was not only the microstructure evolution at low equivalent strains, but also the development of a stable micro-texture, which is achieved earlier by the use of a polycrystalline aggregate.