Phase and structural transformations in Ti-Ta alloys in wide region of compositions

A. Dobromyslov 1Galina V. Dolgikh 1Jan M. Dutkiewicz 2Tamara L. Trenogina 1

1. Russian Academy of Sciences, Ural Division, Institute of Metal Physics, 18 S.Kovalevskaya str., GSP-170, Ekaterinburg 620219, Russian Federation
2. Polish Academy of Sciences, Institute of Metallurgy and Materials Sciences (IMIM PAN), Reymonta 25, Kraków 30-059, Poland

Abstract

The effect of alloy composition on the phase transformation and the microstructure of Ti-Ta alloys were investigated in detail in the present study. Alloys of eight different compositions in range of 1 to 40 at. pct Ta were quenched from β-region in ice water. The phase state and the resulting microstructures were investigated using light metallography, transmission electron microscopy, and X-ray diffraction.

It was established that with increase in tantalum content, the martensitic structure changes from hexagonal α′-phase to orthorhombic α′′-phase. The martensitic α′′-phase was found only in 10 and 30 at. pct Ta. The concentration dependence of the lattice parameters of the α′′-phase, the temperatures of the direct martensitic transformation are given. Omega-phase precipitation were not found in quenched alloys. The alloys of 35 - 40 at. pct Ta consist of metastable β-phase upon quenching only. It was established that stress-induced {110}β and {332}β twinning appeared in metastable β-phase.

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Presentation: Oral at E-MRS Fall Meeting 2006, Symposium I, by A. Dobromyslov
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-19 09:49
Revised:   2009-06-07 00:44
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