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On the evolution of adiabatic shear bands in the beta titanium alloy Ti-10V-2Fe-3Al

Presentation held at TMS 2020, 149th Annual Meeting & Exhibition, February 23-27, 2020; San Diego, California, USA
 
: Scholze, Mario; Frint, Philipp; Winter, Sven; Wagner, Martin Franz-Xaver

2020, 13 Folien
The Minerals, Metals and Materials Society (TMS Annual Meeting and Exhibition) <149, 2020, San Diego/Calif.>
English
Presentation
Fraunhofer IWU ()
titanium; adiabatic shear band; dynamic material testing; shear-compression
Anfrage beim Institut / Available on request from the institute bibliothek@iwu.fraunhofer.de

Abstract
We investigate the evolution of (quasi-)adiabatic shear bands in a Ti 10V 2Fe 3Al alloy with different initial microstructures: solution-annealed β titanium, β titanium with primary α precipitates as well as a condition with primary and secondary α precipitates. Dynamic testing of cyclindrical shear-compression specimens with strain rates up to 10³ s 1 is performed at room temperature. The nominal deformation is limited to predefined strains, which allows to investigate nucleation and propagation of the shear bands using electron microscopy. Our post mortem observations show that the formation mechanisms of (quasi-)adiabatic shear bands differ considerably between the different material conditions. In β titanium with primary α-phase, massive bands with a thickness of 5 µm are formed. In contrast, β titanium with primary as well as secondary α precipitates exhibits many fine, branching shear bands. Our experimental observations contribute to an in-depth micromechanical understanding of the effect of microstructural features on the formation and growth of adiabatic shear bands.

: http://publica.fraunhofer.de/documents/N-597072.html