Berlin 2005 – scientific programme

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M: Metallphysik

M 9: Symposium Complex Metallic Alloys II

M 9.3: Talk

Friday, March 4, 2005, 15:45–16:00, TU H1058

Investigation of Ti-Base Alloys with Positron Annihilation Techniques — •Falko Baier¹, Wolfgang Sprengel², and Mariana Calin³ — ¹Physical Metallurgy, TU Darmstadt, Petersenstr. 23, 64287 Darmstadt — ²ITAP, Stuttgart University, Pfaffenwaldring 57, 70550 Stuttgart — ³Materials Science and Engineering, University Bucharest, Romania

The research and development of Ti-based alloys for biomedical applications is focused on the development of low rigidity beta-phase Ti alloys composed of non-toxic elements with good mechanical properties and workability. A major drawback of these alloys is their poor workability. In order to overcome these limitations lots of work has been spent in order to find new Ti-alloys by varying the compositions or modifying the existing ones for the improvement of the formability. We present measurements of the positron lifetime and coincident Doppler broadening of the positron-electron annihilation photon line in as-cast and deformed Ti-base alloys in order to show the advantages of this non-destructive method for the field of engineering applications, because the sensitivity of positrons to defects in plastically deformed metals has been well-known since the 1960s. The addition of the element-sensitive Doppler broadening technique gives access to the chemical nature of the dislocation environment.