Structurally complex alloy phases: Structure, defects and mechanical properties
Final Report Abstract
The project "Complex metallic alloys: Structure, defects and mechanical properties" was funded within the framework of the programme "Modern metallic materials design" in close collaboration with the Chinese the partners Prof. Z. Zhang and Prof. K.H. Kuo, Beijing Laboratory of Electron Microscopy, and R. Wang, Wuhan University. Complex metallic alloys (CMAs) represent a new and emerging field in materials science. The properties, in particular concerning plasticity, defects and the corresponding structure/property relations, are essentially unknown. The project focused on the experimental investigation of the structure, defects and plastic deformation properties in this class of materials. In the first funding period the investigations of plasticity and defects were spread over a rather broad range of different CMAs. Transmission electron microscopy studies were performed on defects in orthorhombic ^'-AI-Pd-Mn, cubic c2- AI-Pd-Fe, orthorhombic AI13Co4 and cubic ß-AI3Mg2 and corresponding plastic deformation tests were carried out. In the second funding period the focus was laid on a novel type of defect, characteristic of CMAs, the metadislocations. We investigated the formation of metadislocation networks and were able to demonstrate the involvement of metadislocations in phase transformations. The mode of metadislocation motion was identified - it could be shown that metadislocations are prismatic edge loops moving by pure climb. We investigated theoretically the existence of metadislocations in other materials and, as a result of the corresponding experimental investigations, were able to identify novel types of metadislocation in orthorhombic Ali3Co4, in Taylor phases and in s-AI-Pd-Fe. The success of the project is reflected by the high number of scientific publications. The results obtained within the framework of the project was published in eight papers in refereed highstandard journals and presented in nine oral contributions (two invited orals) on German and International conferences.
Publications
- M. Feuerbacher and D. Caillard: [0 1 0] dislocations in the complex metallic alloy ξ'-AI-Pd-Mn. ActaMat. 52, 1297(2004).
- M. Feuerbacher and D. Caillard: [010]-Versetzungen in der komplexen intermetallischen Phase ξ'-Al-Pd-Mn. Spring Conference Condensed Matter Division of DPG, M 30.2, Regensburg, March 8-12, 2004.
- M. Heggen and M. Feuerbacher: Metadislocation networks in the complex metallic alloy ξ'-AlPd- Mn. Conference "Dislocations 2004", La Colle-sur-Loup, France, September 13-17, 2004
- M. Heggen, M. Feuerbacher, and K. Urban: Metaversetzungen und Netzwerke von Metaversetzungen in der komplexen Legierungsphase ξ'-Al-Pd-Mn. Spring Conference Condensed Matter Division of DPG, M 30.5, Regensburg, March 8-12, 2004
- M. Heggen: Metadislocations and Metadislocation Networks in the complex alloy ξ'-AI-Pd-Mn. Project meeting Beijing May 2004.
- M. Feuerbacher: On the nature of phason planes in the complex metallic alloy ξ'-AI-Pd-Mn. Acta Mater. 53, 2005, 3833.
- M. Heggen and M. Feuerbacher: Metadislocation reactions and metadislocation networks in the complex metallic alloy ξ'-AI-Pd-Mn. Mat. Sei. Engng. A 400-401, 2005, 89.
- M. Feuerbacher and M. Heggen: On the concept of Metadislocations in complex metallic alloys. Phil. Mag. 86,2006, 985.
- M. Heggen and M. Feuerbacher: Metadislocation arrangements in the complex metallic alloy ξ'-Al-Pd-Mn. Phil. Mag. 86, 2006, 935.
- D. Deng, K.H. Kuo, M. Feuerbacher, K. Urban: <100> direction chains of 2n interpenetrated icosahedra in hexagonal Zn-Mg-RE (Y, Sm, Gd) phases. Spring Conference Condensed Matter Division of DPG, M 30.2, Regensburg, March 8-12, 2004.
- K.H. Kuo, Z.B. He, Z. Zhang, M. Feuerbacher, and K. Urban: Icosahedral connections in complex metallic alloy phases. Spring Conference Condensed Matter Division of DPG, MM 3.8, Dresden, April 2006
- M. Feuerbacher, M. Heggen, C. Thomas, Z. Zhang, and K.H. Kuo: Single-crystal growth of complex metallic alloy phases. Spring Conference Condensed Matter Division of DPG, MM 3.5, Dresden, April 2006.
- M. Feuerbacher: Defects in structurally complex alloy phases. Kick off meeting of the project, Beijing December 2002.
- M. Feuerbacher: Dislocations in complex metallic alloys. Conference "Dislocations 2004", La Colle-sur-Loup, France, September 13-17, 2004
- M. Feuerbacher: Structurally complex alloys: Structure and Defects. Project meeting Beijing May 2004.
- M. Heggen, D. Deng, and M. Feuerbacher: Plastic deformation properties of the orthorhombic complex metallic alloy phase AH 3Co4. Intermetallics 15,2007, 1425.
- M. Heggen, D. Deng, M. Feuerbacher, Z. Zhang, and K.H. Kuo: The complex metallic alloy phase AI13Co4: Plastic deformation properties and defects. Spring Conference Condensed Matter Division of DPG, MM 3.7, Dresden, April 2006.
- Z. Zhang, D. Herlach, and K. Urban: Modern metallic design. Spring Conference Condensed Matter Division of DPG, MM 3.1, Dresden, April 2006.
