E ISSN 1987 - 8257

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Tuesday, 17 July 2018 08:55

DEVELOPMENT AND INVESTIGATION OF NANOCRYSTALLINE AND AMORPHOUS Ti-Zr-Si  AND  Ti-Zr-Ge ALLOYS

M.Mikaberidze, A.Gachechiladze, V.Gabunia, D. Ramazashvili
(Georgia)

Corrosion resistant amorphous Ti-55Zr-15Ge and nanocrystalline Ti-23Zr-16Si alloys are received by the fast quenching method. The temperature dependence of internal friction and shear modulus of alloys points that alloying by germanium in comparison with silicon keeps better mechanical characteristics of alloys at high temperature. 

The electron diffraction analysis of alloys after the electrochemical investigations showed that on the surface of alloy samples two phases ZrO2 and TiO2 have been revealed after the researches in 10% solutions of  NaOH and HCl. The conducted researches give the ground to expect that the behaviour of Ti-55Zr-15Ge and Ti-23Zr-16Si alloys are defined by passivation of titanium in the studied solutions. This effect helps rising   the corrosion resistance of alloys.

Alloys are recommended for hardening working surface of medical tools of multiply usage. Application of new alloys will allow improving functional properties and increase quality, reliability and service life of medical tools. Alloys with increased hardness, strength and corrosion resistance are not only suitable for medical tools, but are improvements on currently used materials.






PECULIARITIES OF CHANGING INELASTIC CHARACTERISTICS OF Р-TYPE SI0,96GE0,04  ALLOYS, RADIATED BY X-RAY PHOTONS

I.Kurashvili, T.Kimeridze, I.Tabatadze, D.Mkheidze, G.Darsavelidze
(Georgia)

Present work deals with the investigation of the amplitude dependences of internal friction and dynamic shear modulus of р-type coarse-grained Si0,96Ge0,04 alloy, grown by Czochralski method, radiated by X-rays with a fluencies of  5.1015 cm-2. It is shown, that radiation exposure by X-rays modifies the subsystem of the structural defects, formed in a crystal growthprocess. After annealing at 200-4000С temperatures there is a tendency for dynamic mechanical hardening due to the enlargement of radiation defects in the atmospheres around the dislocations and conditions for their blocking. 


Last Updated on Wednesday, 09 January 2019 17:44
 
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