|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformation Across Multiscale Material Interfaces
||The Effect of Diffusion on the Microstructure and Properties of a NiAl-based Anchor Phase Coating for CMSX-4
||Megan McGregor, Matthew Hancock, Lloyd Pallett, William Clegg
|On-Site Speaker (Planned)
Limiting leakage of gas from the flow path in a gas turbine is critical for maximising efficiency. One solution is to tip shroudless turbine blades with a surface treatment of abrasive particles held in an anchor phase that cuts into abradable material on the static counter face. However, current anchor phase materials are often too weak to retain the abrasive particles under abrasion. A new anchor phase system, NiAl strengthened with a reinforcing Laves phase, NiTaAl, has been identified. The interactions between Ni<SUB>45.3</SUB>Al<SUB>44.7</SUB>Ta<SUB>10</SUB> and a turbine blade material, CMSX-4, have been investigated at operational temperatures using a diffusion couple method, and the observed microstructural changes compared with predictions calculated using DICTRA. High temperature pin-on-disc abrasion tests have been used to characterise how the microstructural changes affect the abrasion performance of the anchor phase over the tip lifetime, and to assess the suitability of this material in such a demanding application.
||Planned: Supplemental Proceedings volume