| AVS 61st International Symposium & Exhibition | |
| Thin Film | Tuesday Sessions |
| Session TF+SE-TuM |
| Session: | Energetic Thin Films/Optical Characterization |
| Presenter: | Michael Grapes, Johns Hopkins University |
| Authors: | M.D. Grapes, Johns Hopkins University M.K. Santala, Lawrence Livermore National Laboratory T. LaGrange, Lawrence Livermore National Laboratory G.H. Campbell, Lawrence Livermore National Laboratory D.A. LaVan, National Institute of Standards and Technology (NIST) T.P. Weihs, Johns Hopkins University |
| Correspondent: | Click to Email |
The Al/Ni formation reaction is highly exothermic and of both scientific and technological significance. In particular, Al/Ni thin-film multilayers have been used as a model system to understand how steep concentration gradients and large heating rates affect the identity and sequence of phases that form at the interface between two materials. We have developed an in situ nanocalorimetry system that enables us to simultaneously measure the heat generated by the Al/Ni reaction and observe the phases formed. The added ability to controllably vary the heating rate from 1000 K/s to 100,000 K/s makes possible a systematic assessment of the phase transformation sequence with heating rate that we hope will shed light onto the relative effects of kinetic and thermodynamic phase suppression in determining the first phase to form. In this talk I will describe the experimental system, present the baseline results that are obtained at low heating rates, and provide an update detailing recent results and potential conclusions of the systematic study.