Extensive disordering in long-range-ordered Cu3Au induced by severe plastic deformation studied by transmission electron microscopy
✍ Scribed by C. Rentenberger; H.P. Karnthaler
- Book ID
- 103998446
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 678 KB
- Volume
- 56
- Category
- Article
- ISSN
- 1359-6454
No coin nor oath required. For personal study only.
✦ Synopsis
Bulk nanocrystalline materials can be made by severe plastic deformation. In L1 2 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 Cu 3 Au; 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.