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Home Georgian Technologies Synthesis of Two- and Multilayer Functionally Gradient Materials

Synthesis of Two- and Multilayer Functionally Gradient Materials

Description

Hard alloys with high physical and mechanical properties make them very useful in several branches of engineering. However, wider application of the material is limited by their brittleness and inability to protect shock stresses. This deficiency of hard alloys may be avoided by creation of graded materials with very disperse grains. Due to the peculiarities of SHS-compacting production of oversaturated solid solutions with non-equilibrium structure with fine grains (1-3μ) is possible. Moreover, heat treatment may provide precipitation of more fine-grained phase in an amount sufficient alter mechanical properties of final product. In the present paper results of development of two and multilayer graded materials are discussed, which on the one hand have properties intrinsic to hard alloys, and on the other hand they possess a high impact strength as well.

Innovative Aspect and Main Advantages

Three different Functionally Gradient Materials (FGMs) are developed using the SHS-compacting which contain 1 or 2 HTTMT (high-temperature thermo-mechanical treatment) layers.

At least one layer is an oversaturated solid solution. Additional heat treatment provides increase in strength of the FGM, and this results in the improvement of material’s shock resistance. The first material consists of one layer with ironbased alloy, undergone HTTMT (thickness 1-1.5mm), and the second layer containing titanium-chromium carbide (3.5 – 4mm).

The second material consists of three layers.
Layer I – titanium boride (2 -2.5m);
layer II – titanium-based HTTMT alloy (up to 1mm);
layer III - solid solution of titanium diboride and titanium carbide (3 – 3.5mm).

The third material is composed of four layers. Two of them are HTTMT-alloys (the first is iron-based alloy, 1-1,2mm, and the third is a titaniumbased alloy, up to 1mm). The rest two layers represent oversaturated solid solutions: the second layer – tita nium-chromium carbide, 3,5 – 4mm, and the fourth layer, solid solution of titanium diboride and titanium carbide, 4 – 4,5mm).

Areas of Application

Can be applied as armored elements for individual and equipment protection.

FGMs obtained by SHS.
Fig. 1 FGMs obtained by SHS.

Stage of Development

Available for demonstration; field tests have been conducted.

Contact Details

George Oniashvili
Organization: F.Tavadze Institute of Metallurgy and Materials Science
Address: 15, Al Kazbegi 0160 Tbilisi, Georgia
(+995 32) 38 2942; (+995 99) 41 6162
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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