TEM Study of Local Disordering: A Structural Phase Change Induced by High-Pressure Torsion

Christian Rentenberger; Clemens Mangler; Stephan Scheriau; Reinhard Pippan; Hans Peter Karnthaler

doi:10.4028/www.scientific.net/MSF.584-586.422

Paper Titles

Activation Volume in Fine Grained Metals from Stress Relaxation and Nano-Indentation
p.399

Ultimate Strength of a Tungsten Heavy Alloy after Severe Plastic Deformation at Quasi-Static and Dynamic Loading
p.405

TEM Studies on the Effect of Nature of Precipitates in Al-Li Alloy on Microstructural Evolution during Severe Plastic Deformation
p.411

Strengthening of Nickel Deformed by High Pressure Torsion
p.417

TEM Study of Local Disordering: A Structural Phase Change Induced by High-Pressure Torsion
p.422

Bulk Al Materials from Back Pressure Equal Channel Angular Consolidation of Mechanically Milled Particles
p.428

3D Tomographic EBSD Measurements of Heavily Deformed Ultra Fine Grained Cu-0.17wt%Zr Obtained from ECAP
p.434

Mechanical Properties and Microstructure Development of Ultrafine-Grained Cu Processed by ECAP
p.440

The Evolution of Homogeneity during Processing of Commercial Purity Aluminium by ECAP
p.446

HomeMaterials Science ForumMaterials Science Forum Vols. 584-586TEM Study of Local Disordering: A Structural Phase...

TEM Study of Local Disordering: A Structural Phase Change Induced by High-Pressure Torsion

Abstract:

Long-range ordered intermetallic alloys with L12 (Ni3Al, Cu3Au) and B2 (FeAl) structures were deformed by high-pressure torsion at room temperature up to high grades of deformation. Transmission electron microscopy shows that disordering caused by the deformation occurs on a very local scale within coarse grains along glide planes (Cu3Au, Ni3Al) and in the form of well defined local regions (Ni3Al, FeAl). The latter leads to a duplex structure consisting of an ordered coarse-grained structure and a disordered nanocrystalline structure. The different mechanisms that can lead to disordering during severe plastic deformation are discussed on the basis of the different ordering energies and on the basis of antiphase boundaries associated with gliding dislocations. The results indicate that in intermetallic alloys the formation of a nanocrystalline structure by severe plastic deformation is facilitated by the loss of order.