Hamburg 2001 – wissenschaftliches Programm

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M: Metallphysik

M 9: Diffusion und Punktdefekte I

M 9.3: Fachvortrag

Montag, 26. März 2001, 10:45–11:00, S12

Influence of Temperature Exposure on β-Phase Vanadium Distribution in Ti6Al4V — •Lutz Reissig and Uwe Glatzel — Universität Jena, Metallische Werkstoffe, Löbdergraben 32, D-07743 Jena

The studied alloy is Ti6Al4V consisting of 6 wt.% aluminum and 4 wt.% vanadium. In this work an effect of temperature exposure (e.g. due to fabrication steps) on this alloy is shown. Ti6Al4V consists of different phases: the primary α-phase, as a result of a re-crystallization process and a following heat treatment, the secondary α-phase (needle-shaped), nucleating during cooling inside the β-grains and the β-phase. The combination: secondary α-phase and β-phase is the so called transformed β-grain. Inside the β-phase a non-homogenous enrichment of vanadium (β-stabilizer) occurs. The highest vanadium concentration, about 25-30 wt.%, can be observed near the grain-boundary of a transformed β-grain. Going inwards in the transformed β-grains, away from the grainboundary, the concentration decreases. Due to a short time annealing process, in our case: 2 minutes, of samples of 200 µm thickness the vanadium concentration profile becomes more homogeneous, reaching a concentration of 4.5 wt.% at a temperature of about 1000^∘C. The temperature dependent maximum vanadium concentrations are compared with a vanadium concentration measured at the surface of a drilling hole (drilling depth: 90 mm, diameter: 4 mm). This results in a temperature of about 600^∘C derived from the maximum vanadium concentration measured.