High Strength Materials by Dynamic Compaction
New High Strength Materials Produced with Dynamic Compaction and Preliminary Mechanical Alloying
Tech Area / Field
3 Approved without Funding
Institute of Electrophysics, Russia, Sverdlovsk reg., Ekaterinburg
- MISIS (Steel and Alloys), Russia, Moscow
- Forschungszentrum Karlsruhe Technik und Umwelt / Institut für Hochleistungsimpuls und Mikrowellentechnik, Germany, Karlsruhe
Project summaryThe rough advance in technology has asked in necessity of creation of new materials with the improved properties. For the last years the new classes of materials are created. For example, Metal Matrix Composites and quasi-crystalline materials.
However at deriving such materials there are definite difficulties.
Aim of this project is development of new methods of producing and treating of high-strength materials. Basic approaches are mechanical alloying and dynamic compaction.
The mechanical alloying (treating in high energy activators) is an effective method of obtaining of complicated compositions. However large problem is further compaction of a powdered material, obtained after mechanical alloying. An effective method of obtaining high homogeneous density of porous materials is dynamic compaction. Dynamic compaction methods successfully combine operating on powders of high impulse pressure and kinetic impulse. Due to high energy of inter-particle interaction the internal viscosity of treated material is decreased and the intensity of plastic deformation of fragments increases. Adiabatic increasing of powder temperature follow-up boost these positive effects. Project includes applying two kinds of dynamic compaction: magnetic-impulse pressure and explosive treatment. These two methods allow realizing over wide range high speeds of loading, 30-3,000 ms, and high pressures, 1-40 GPa, as results in a positive take. It is possible to vary several parameters in each of methods that will allow varying strain-stress state and fast-track conditions of sealing over a wide range. One of major problems of the project is the development of rational conditions of treatment for obtaining dense homogeneous materials with the high mechanical properties.
Project includes use of developed methods for treating following types of materials:
– metal matrix composites:
– on the basis of aluminum alloys with reinforcements from silicon carbide;
– on the basis of copper-alloys with reinforcements from silicon carbide.
– quasi-crystalline materials of a system Al-Cu-Fe.
The treating in mechanical activators will allow realizing high cohesion (adhesion) between a material of a matrix and reinforcements. Size of particles decreases during mechanical alloying; this decreasing improve material quality. Project includes application of two types of silicon carbide particles:
– with the average size of fragments about 10 microns (during treating to reduce it up to 1-3 microns);
– with the average size of particle about 0.1-0.5 microns (the decrease of the size of fragments during treating does not take place).
Separate stage of work will be study of a possibility of obtaining MMC with particle size less than 0.5 micron and MMC with diamond nano-powder by mechanical alloying. Such speed keys can find applying in many branches of engineering, where the high wear resistance is required at minimum unevenness.
Quasi-crystalline materials have attracted in itself notice with the not ordinary properties. However main problem of obtaining dense quasi-crystalline material is complication of sealing of the synthesized powdered material. The proposed schema of compaction can decide this problem at applying preheat impulse compaction and intermediate thermal treatments. Short time of pressing permits to save quasi-crystalline structure. The determination of rational conditions of compaction on each buffer stage between furnacings and conditions of heat treatment is a complicated research task.
The collectives of the scientific employees of IEPh and MISA possess experience of operation with such materials and with such aspects of treating, possess a broad spectrum of analytical methods, that gives reliance that the project will be executed at a high technological level.
The above-stated materials discover now broad applying in many branches of a machine industry, for example in motor industry and aircraft construction. Therefore project is directional on engaging scientific for a solution of peace problems, that completely corresponds to the purposes and problems of ISTC.
The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.
ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.