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Imaging of microstructural features and local stiffness of alpha- and beta-phases in the titanium Ti-6Al-4V alloy by atomic force acoustic microscopy

: Rabe, J.; Rabe, U.; Hirsekorn, S.

Mazal, P. ; Czech Society for Nondestructive Testing; Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. -DGZfP-, Berlin:
NDT in Progress. 5th International Workshop NDT in Progress 2009 : Meeting of NDT-Experts, Proceedings, October 12 - 14, 2009, Prague, Czech Republic
Brno, 2009
ISBN: 978-80-214-3968-9
International Workshop NDT in Progress <5, 2009, Prague>
Fraunhofer IZFP ()
Atomic Force Microscopy (AFM); atomic force acoustic microscopy (AFAM); titanium alloy; heat treatment; stiffness

Titanium is a strong, highly creep resistant, light, heat-resisting, biocompatible, and corrosion resistant transition metal with a broad field of applications in industry. The most commonly used titanium alloy is Ti-6Al-4V covering 60% of the titanium market in which 80% accounts for aerospace industry. This contribution reports on imaging and characterization of a series of Ti-6Al-4V samples by atomic force acoustic microscopy (AFAM). With this near-field acoustic imaging technique a spatial resolution of some ten up to a few nanometers can be achieved. Objective of the investigation was to visualize the microstructure of alpha- and beta-phases formed by different heat treatments and to determine quantitatively their local elastic properties. Energy-dispersive X-ray spectroscopy (EDX) was applied in order to identify the different phases. Furthermore backscattered electron (BSE) images of the samples were recorded and compared to the AFAM images.