Ab-Initio Molecular Dynamics Simulations of Molten Ni-Based Superalloys
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 atomic volumes of Ni-Al, Ni-W, Ni-Re and Ni-Al-W melts.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2007
- Accession Number
- ADA490101
Entities
People
- Christopher Woodward
- Dallas Trinkle
- Mark Asta
Organizations
- Air Force Research Laboratory