Composite Alloys with Superplasticity
Development, Acquisition and Investigation of Aluminum Composite Alloys with High Strain-Rate Superplasticity Effect
Tech Area / Field
- MAT-ALL/High Performance Metals and Alloys/Materials
8 Project completed
Senior Project Manager
Novozhilov V V
Mechanical Engineering Research Institute, Russia, N. Novgorod reg., N. Novgorod
- VNIIEF, Russia, N. Novgorod reg., Sarov
- Osaka Prefecture University, Japan, Osaka\nLawrence Livermore National Laboratory, USA, CA, Livermore
Project summaryThe purpose of the project is the development of the technology to obtain composite alloys with the high strain-rate superplasticity effect by methods of powder metallurgy and severe plastic deformation. Results of work under the project will allow to obtain massive specimens of composite alloys, capable to be deformed under the superplasticity condition with strain rates, close to the strain rates, used in traditional technologies of metal treatment (cold forming) in an interval of homological temperatures 0,4-0,6 with limiting deformations no less than 400 %. At present, the superplastic strain rates, mentioned above, are received only for a small number of composite alloys with a complex chemical and phase composition in a rather narrow interval of temperatures near to temperature of solidus (0.96-0.99 TS) on millimeter-size samples.
The obtaining of composite materials by methods of powder metallurgy and severe plastic deformation allows essentially to simplify technology of production of composite alloys with high-temperature superplasticity effect, to make massive samples, suitable for application in traditional technological processes of superplastic forming (SPF). The increase of strain rate up to 101 s-1 will allow essentially (in 10-100 times) to reduce the time of one SPF operation and, in the aftermath, to achieve a steep rise in productivity of SPF process.
The Russian Federal Nuclear Center works on the obtaining of a new powder materials and investigates their chemical and phase composition, structure and physical-mechanical properties. In RFNC-VNIIEF there is an experience on the investigation of superplastic properties of powder materials, received by methods explosive pressing. These researches were made under the contract N 301642 between RFNC-VNIIEF and Lawrence Livermore National Laboratory.
NNBMERI RAS has an experience of theoretical and experimental investigation of structural superplasticity. In particular, the new approach to describe this phenomenon is developed by the scientists of NNBMERI RAS. The approach allows not only to give the theoretical description of experimentally observed regularities of structural superplasticity, but also to develop original methods of calculation and optimization of chemical and phase structure, parameters of microstructure of materials to reach superplasticity effect in a given interval of strain rate.
During many years NNBMERI RAS worked on the development of scientific bases for the technology of strain induced refinement. In particular, in NNBMERI RAS the original experimental methods, allowing to investigate the parameters of microstructure and the kinetic of microstructural modifications in nano- and microcrystalline alloys, are created. Methods of grain structure stabilization of nano- and microcrystalline alloys are developed for various temperature and deformation conditions.
The result of the work will be the development of a method to receive composite alloys with high strain rate superplasticity effect, which can be used in industry for manufacturing machines details and elements of constructions of the complex form with application of known technologies of superplastic forming.
Results will include:
— The recommendations on the powder technology to receive the alloys of optimum composition.
— The recommendations on the technology of severe plastic deformation, providing the reception of a submicron grains in a composite alloy.
— The recommendations on the regimes of high strain rate superplastic deformation (e ~ 101 s-1) of composite alloys.
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