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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Waitz, Thomas
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Topics
Publications (9/9 displayed)
- 2021In Situ Synchrotron X‐Ray Diffraction during High‐Pressure Torsion Deformation of Ni and NiTicitations
- 2016Experimental and theoretical evidence of displacive martensite in an intermetallic Mo-containing $gamma$-TiAl based alloycitations
- 2016Mechanical properties, structural and texture evolution of biocompatible Ti–45Nb alloy processed by severe plastic deformationcitations
- 2013Thermal stability and phase transformations of martensitic Ti-Nb alloyscitations
- 2007Formation and structures of bulk nanocrystalline intermetallic alloys studied by transmission electron microscopycitations
- 2005Martensitic phase transformations of bulk nanocrystalline NiTi alloys
- 2004HRTEM analysis of nanostructured alloys processed by severe plastic deformationcitations
- 2004TEM of nanostructured metals and alloyscitations
- 2003TEM investigation of the structure of deformation-induced antiphase boundary faults in Ni3Alcitations
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article
Formation and structures of bulk nanocrystalline intermetallic alloys studied by transmission electron microscopy
Abstract
The evolution of nanocrystalline structures in bulk intermetallic alloys made by high-pressure torsion (HPT) was investigated using transmission electron microscopy methods. HPT deformation of long-range ordered Ni3Al induces a heterogeneous formation of a nanocrystalline (NC) structure accompanied with disordering of the nanograins. At a strain of 40,000%, about 90% of the volume is transformed to the NC structure. From the existence of retained coarse-grained (CG) volumes, it is concluded that the two different structures carry different strains during HPT. The weak texture of the NC structure indicates that an inter-granular deformation process is occurring. In NiTi shape memory alloys subjected to HPT, grain refinement and texture formation is followed by amorphization. Nanocrystalline debris that has survived the deformation is embedded in an amorphous matrix. During devitrification of the amorphous phase these nanocrystallites act as nucleation sites. The nuclei trigger the formation of a nanocrystalline structure of a preferred crystallographic orientation that corresponds to that of the original texture after HPT deformation. © 2006 Elsevier B.V. All rights reserved.