Ab-Initio Molecular Dynamics Simulations of Molten Ni-Based Superalloys (Preprint)
Abstract
In casting of single-crystal turbine blades for jet engines, the formation of solidification defects has become an increasingly important problem due to the rising levels of refractory elements in Ni-based superalloys. Refractory elements, which are beneficial for high-temperature mechanical properties, enhance density-driven convective instabilities underlying the formation of freckle defects in directional solidification. In support of an effort aimed at the development of validated mathematical criteria for predicting solidification-defect formation in superalloys, ab-initio molecular dynamics simulations have been performed to calculate volumes of Ni-AI, Ni-W, Ni-Re, Ni-Ta, Ni-Al-Re, Ni-Al-Ta, Ni-Al-W, and complex chemistries approximating RENE-N4 melts.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2008
- Accession Number
- ADA489306
Entities
People
- Christopher Woodward
- Dallas R. Trinkle
- James Lill
- Mark Asta
- Stefano Angioletti-uberti
Organizations
- Air Force Research Laboratory