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Home Material Sciences New methods of production of nanostructured monolithic metals

New methods of production of nanostructured monolithic metals

Description

Residual porosity and unchecked pollution of powders during their condensation causes need of development of new methods of formation the nanostructured state in monolithic metals and alloys.The most effective directions in this field are the equal-channel angular extrusion (ECAE) and hydroextrusion. As a rule, hydroextrusion is carrying out at room temperature, while ECAE is realizing at elevated temperatures. However, at room and elevated temperatures the processes of dynamical relaxation take place. That sets a principal limit to the defect density attained during deformation and, therefore, degree of the structure dispersion. It explains the search of possibility of the deformation of materials at deep cooling. At different time plastic deformation by tension, rolling, and drawing were realized at cryogenic temperatures. Under these conditions the processes of dynamical relaxation are depressed. However, due to specific character of geometry of acting forces hardening is accompanied by a drastic reduction of plasticity and appearance of a plenty of microcracks.

The task of obtaining of high-strength nanostructured materials but without tendency to brittle failure may be solved by combining effect of all-round compression precluded to appearance of tensile stresses and factor of deep cooling. Depression of the dynamical relaxation was ensured by the pressing of metal through a matrix at low temperature with use as the pressure the plastic transmission medium. Treatment based on this technology insures obtaining of dispersion of material structure at the level of 100 nm and less, which improves their exploitation characteristics. Its level, however, depends on geometry of treated blanks and degree of deformation during treatment, which makes difficulties for control of the structure characteristics, the obtaining in advance given parameters and limits the upper level of material dispersion. This problem was solved by application forces of opposite pressure, which level is controlled.

Innovative Aspect and Main Advantages

Processing of metals in conditions deep cooling at all-round compression is know how of KIPT, this method is protected by several patents and allows to receive such level of thermally steady hardening which known ways of deformation of metals do not allow to obtain.

Areas of Application

Various branches of mechanical engineering, medicine.

Brittle fracture without opposite pressure
Fig. 1 Brittle fracture without opposite pressure
(hardening 10-15 %)

Plastic deformation with opposite pressure
Fig. 2 Plastic deformation with opposite pressure
(hardening 50-70 %)

Stage of Development

Stage of development – the method is tested by laboratory tests. «A way of reception the nanostructured metals and alloys and the device for its realization», Khaimovich P.A., the patent application of Ukraine #2004010171 from 09.01.2004г., positive decision, January 2006.

Contact Details

National Scientific Center, "Kharkov Institute of Physics and Technology"
Khaimovich Pavel Aleksandrovich
1 Akademicheskaja St., 61108 Kharkov, Ukraine
Tel.: +380 57 7002676; +380 57 7576428
Fax: +380 44 3351688
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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