|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||Point Vacancy Affects on Ni/Al Nanolaminate Interface Diffusion and Combustion
||Brandon Witbeck, Douglas Spearot
|On-Site Speaker (Planned)
Nanolaminate Ni/Al structures have been widely investigated for their high combustion temperatures, reaching nearly 2000 K, and combustion wave speeds on the order of 10s of m/s. These high temperatures and fast wave speeds have promoted investigation into military applications. These military environments can generate thermal and kinetic loads which may then create atomic-scale defects. Unfortunately, little is known about the effects of preexisting defects and how they affect atomic diffusion across the Ni/Al interface and the resulting combustion characteristics. As an initial investigation, this paper evaluates the effect of point vacancies, as a surrogate for higher-level defects, on the combustion rate and combustion temperature. A wide range of vacancy percentages are evaluated, as well as the effect of vacancy distribution between individual materials and vacancy gradients within a particular material. The effect of coupling between vacancy defects and applied temperature and pressure, stoichiometry and bi-layer spacing are also investigated.
||Planned: Supplemental Proceedings volume