Paper Title:
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.

  Info
Periodical
Materials Science Forum (Volumes 584-586)
Edited by
Yuri Estrin and Hans Jürgen Maier
Pages
422-427
DOI
10.4028/www.scientific.net/MSF.584-586.422
Citation
C. Rentenberger, C. Mangler, S. Scheriau, R. Pippan, H. P. Karnthaler, "TEM Study of Local Disordering: A Structural Phase Change Induced by High-Pressure Torsion", Materials Science Forum, Vols. 584-586, pp. 422-427, 2008
Online since
June 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Mikhail D. Starostenkov, Evgenia Dudnik, Galina Popova, Evgeniya Chernykh
Abstract:Ordered alloys and intermetallides are important constructional materials, because they have a unique property – positive temperature...
117
Authors: David Geist, Christian Rentenberger, Hans Peter Karnthaler
Abstract:The L12-structured intermetallic compound Zr3Al can be rendered amorphous easily by several techniques. In the present study the structural...
553
Authors: Hiroyuki Y. Yasuda, Yasuhiro Oda, Takuya Kishimoto, Yukichi Umakoshi
Abstract:In Fe3Ga single crystals with the D03 structure, three types of pseudoelasticities based on dislocation motion,...
31
Authors: Hiroyuki Y. Yasuda, Tsuyoshi Furuta, Takenori Maruyama
Chapter 17: Smart Intelligent Materials and Processes
Abstract:Pseudoelasticity of Fe3Ga polycrystals doped with third elements (Ti, V, Cr, Mn, Co, Ni, Si, Ge) was examined. Fe3Ga...
2032
Authors: Mikhail Starostenkov, Alexandra Chaplygina, Veronika Romanenko
Chapter 6: Nanomaterials: technology, properties and modeling
Abstract:Alloys of Cu-Pt [1] are of interest for research, since the phase transitions "order - disorder" at different concentrations of components...
321