|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Determination of Gamma/Gamma Prime Lattice Misfit in Ni-based Single Crystal Superalloys at High Temperatures by Neutron Diffraction
||Shenyan Huang, Yan Gao, Akane Suzuki, Ke An
|On-Site Speaker (Planned)
Lattice misfit between Gamma and Gamma-Prime phases is one of the critical properties that influence thermal stability and high temperature mechanical behaviors of Ni-based single-crystal superalloys used in aircraft engines and power generation gas turbines. Lattice misfit can be altered by alloy composition, heat treatment conditions, and temperature, via Gamma and Gamma-Prime phase compositions. Determination of lattice misfit is an important step to link structure and properties and provide input for modeling microstructure and properties of single crystal superalloys. However, very few high-temperature misfit data are available in literature as accurate determination of lattice misfit for single crystals is not trivial. In this talk, experimental methods & challenges to measure misfit will be reviewed, and results (up to 2200°F) for commercial single crystal superalloys including René N4, René N5, CMSX4, PWA1484, will be presented. Effects of chemistry and heat treatment on lattice misfit will be discussed.