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F. Warchomicka, M. Stockinger, H.P. Degischer:
"Quantitative analysis of the microstructure of near b-titanium alloy during compression tests";
Talk: 11th International Conference on Metal Forming 2006, University of Birmingham, Birmingham, UK; 09-11-2006 - 09-13-2006.

Near b titanium alloys present better formability at moderate temperatures compared to a-b alloys. On the other hand, the strength of the forged workpiece is markedly increased after heat treatments by a-phase precipitation hardening. These properties make those high strength Ti-alloys attractive for aircraft and aerospace components.
In this work, the formability of Ti-10V-2Fe-3Al is studied. Hot compression tests with cylindrical specimens are performed by means of a Gleeble®1500 machine at temperatures below b-transus (788°C) and at constant strain rates of 0.01, 0.1 and 1s-1. The flow curves show a continuous softening at 0.1 and 1s-1 after an initial stress peak, and steady flow at low strain rate (0.01s-1). The evolution of the microstructure for specimens deformed to different strain levels is examined. A quantitative analysis of SEM images is carried out to determine the distribution, shape and content of a phase before and after deformation. The local strain within the compression specimens is determined by a finite element method and correlated to the microstructure.