|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||R-curve Behaviour of Different Nearly Lamellar Microstructures in an Intermetallic Ti-43.5Al-4Nb-1Mo-0.1B Alloy
||Martin Schloffer, Thomas Leitner, Svea Mayer, Helmut Clemens, Jörg Esslinger, Wilfried Smarsly, Reinhard Pippan
|On-Site Speaker (Planned)
In this study the R-curve behaviour of different microstructures of a Ti-43.5Al-4Nb-1Mo-0.1B (at.%) alloy, was fracture mechanically tested. The focus was placed on the study of the crack growth behaviour of different nearly lamellar (NL) microstructures. The crack length was thereby measured in-situ with the potential drop technique from room temperature up to 700°C. Four NL microstructures were adjusted by different multi-step heat treatments. The crack propagation curve, as measured by the potential drop technique, is transferred into the Kitagawa diagram and is compared to the experimentally evaluated crack propagation achieved from short crack experiments. It was found that the fracture toughness depends on the structure of the colony boundaries and crack propagation on oxidation mechanism.
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