Phase transformations during rapid heating of {Al/Ni} multilayer foils
Jonathan C Trenkle,
Lucas J Koerner,
Mark W Tate,
Sol M Gruner,
Timothy P Weihs,
Todd C Hufnagel
January 2008
Abstract
We have used self-propagating exothermic reactions in Al/Ni multilayers as a means to explore the effect of rapid heating on phase transformations. Using time-resolved synchrotron x-ray microdiffraction with an extremely fast detector, we were able to examine the reaction sequence in detail at heating rates of K/s. We observed that the intermediate phases formed during the self-propagating reactions are different from those formed at lower heating rates, even though the final phases are the same. In situ characterization is essential, as other means of studying self-propagating reactions such as quenching the reaction followed by ex situ analysis provide different-and potentially misleading—results.
Publication
Applied physics letters