α--phase transformation in titanium induced by power ion-beam irradiation

Author: Lavrentiev V.   Hammerl C.   Auschenbach B. R   Pisanenko A.   Kukharenko O.  

Publisher: Taylor & Francis Ltd

ISSN: 0141-8610

Source: Philosophical Magazine. A. Physics of Condensed Matter. Defects and Mechanical Properties, Vol.81, Iss.2, 2001-02, pp. : 511-527

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Abstract

Irradiation of pure titanium by power ion beams (PIBs) with a power density of 29 MWcm-2 and a pulse of 70 ns was performed. The first pulses of the PIB lead to the formation of an underlayer with a nanosize structure and of internal compressive macrostresses. Simultaneously a fibre texture with the \[1120]α axis parallel to the ion beam direction is formed. After 30 pulses of the PIB the high-pressure  phase was detected in titanium. A new orientation relationship between the initial α and the final  phases was found to be (1120)α//(1230)and \[1012]α//\[0001]. This relationship proves a direct phase transformation α-. On the basis of this relationship an atomic mechanism of this transformation is proposed that permits us to explain consistently the present and previously reported experimental results.