Tammann’s Grain Boundary Substance Revisited
| Autor: | D. Kuhlmann-Wilsdorf, H. G. F. Wildsorf |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Materials science
Metals and Alloys chemistry.chemical_element Mineralogy Crystal structure Condensed Matter Physics Microstructure Condensed Matter::Materials Science chemistry Aluminium visual_art Materials Chemistry Aluminium alloy visual_art.visual_art_medium Grain boundary Physical and Theoretical Chemistry Deformation (engineering) Dislocation Composite material Grain boundary strengthening |
| Zdroj: | International Journal of Materials Research. 84:278-285 |
| ISSN: | 2195-8556 1862-5282 |
| DOI: | 10.1515/ijmr-1993-840414 |
| Popis: | Very dense dislocation networks overlying grain boundaries in extruded and cold-deformed MA aluminium alloys, in the asreceived or annealed condition, have been identified as dislocation rotation boundaries which accommodate relative misorientations between neighboring grains caused by subsequent deformation. The fact that the dislocations involved are not annihilated at the grain boundaries indicates the presence of a continuous very thin grain boundary film reminiscent of Tammann's grain boundary substance. A search has revealed micrographic evidence for such films whose thickness may be only a few atomic diameters. It is concluded that such films may be fairly prevalent in ultra-fine-grained metals and may contribute both to their hardness and high temperature strength |
| Databáze: | OpenAIRE |
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