Phase transformations during rapid heating of Al/Ni multilayer foils

Trenkle, Jonathan C.; Koerner, Lucas J.; Tate, Mark W.; Gruner, Sol M.; Weihs, Timothy P.; Hufnagel, Todd C.
August 2008
Applied Physics Letters;8/25/2008, Vol. 93 Issue 8, p081903
Academic Journal
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 ∼106 K s-1. 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.


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