|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Nanosized TaC Precipitates for Strengthening High-Temperature Co-Re Based Alloys
||Ralph Gilles, Debashis Mukherji, Pavel Strunz, Lukas Karge, Premysl Beran, Armin Kriele, Michael Hofmann, Joachim Roesler
|On-Site Speaker (Planned)
This contribution will present a promising candidate for gas turbine applications - the high tempertaure Co-Re alloy . Co-Re alloys consist of a complex microstructure with various kinds of precipitates at different size scales. The nanosized fine spherical TaC (< 50 nm) are the most important for strengthening. Larger TaC are present as rounded (0.5 - 5 µm) or as so called Chinese script (> 5 µm) precipitates. In addition, large Cr<SUB>2</SUB>Re<SUB>3</SUB> primary σ phase particles (a few µm) and fine lamellar Cr<SUB>23</SUB>C<SUB>6</SUB> precipitates (thickness < 100 nm) exist in the alloy. All these phases are embedded in a matrix structure of ε phase (hcp) which transforms allotropically at high temperature to γ phase (fcc). Samples were characterized using SEM, XRD, neutron diffraction and small-angle neutron scattering.  J. Rösler et al., Adv. Eng. Mater. 9 (2007) 876-881;  R. Gilles et al., J. Appl. Cryst. (2016) in print.