Extensive disordering in long-range-ordered Cu3Au induced by severe plastic deformation studied by transmission electron microscopy

Autor(en)

Christian Rentenberger, Hans-Peter Karnthaler

Abstrakt

Bulk nanocrystalline materials can be made by severe plastic deformation. In L12 long-range-ordered alloys, this leads to extensive disordering which influences the highly improved properties of these nanocrystalline alloys. Transmission electron microscopy methods were applied to Cu3Au; both diffraction contrast images and diffraction patterns reveal that disordering takes place locally. It is concluded that in addition to disordering by the refinement of the grown-in antiphase boundary domains, the formation of antiphase boundary tubes is a prominent process of disordering. The latter is facilitated by the fact that, unlike dislocations, antiphase boundary tubes can be stored at a very high density without causing long-range stresses. The local disordering indicates that the nanocrystalline structure nucleates inhomogeneously in the highly strained disordered regions. © 2008 Acta Materialia Inc.

Organisation(en)

Physik Nanostrukturierter Materialien

Journal

Acta Materialia

Band

56

Seiten

2526-2530

Anzahl der Seiten

5

ISSN

1359-6454

DOI

https://doi.org/10.1016/j.actamat.2008.01.035

Publikationsdatum

2008

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/eeaabda5-891b-45ce-a9ae-04c249534840