Dislocations in continuous filament reinforced W/NiAl and Al2O3/NiAl composites
| Autor: | K. Xu, L. Wang, R.J. Arsenault, R. R. Bowman |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Nial
Materials science Metallurgy Metals and Alloys Intermetallic chemistry.chemical_element Temperature cycling Tungsten Condensed Matter Physics Thermal expansion Protein filament Condensed Matter::Materials Science chemistry Mechanics of Materials Dislocation Deformation (engineering) Composite material computer computer.programming_language |
| Zdroj: | Metallurgical and Materials Transactions A. 28:2755-2761 |
| ISSN: | 1543-1940 1073-5623 |
| Popis: | Continuous filament reinforced W/NiAl and Al2O3/NiAl composites (as-processed, annealed, and thermally cycled) have much higher dislocation densities than that of monolithic NiAl. These higher dislocation densities resulted from the relaxation of thermal residual stress, which developed during the cooling of the sample from elevated temperatures and was caused by the difference in the coefficients of thermal expansion between the matrix and the reinforcement. The dislocation density in the region adjacent to the matrix-filament interface was high and decreased only slightly with distance from the interface in the 30 vol pct composites. The as-processed and annealed composites exhibited a rather homogeneous dislocation density in the matrix. After thermal cycling, these composites showed no large difference in the dislocation density and morphology. However, there were local regions of lower dislocation densities. This difference was examined in relationship to filament fracture, surface matrix cracking, and degree of bonding. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink