In situ transmission electron microscopy investigation of the interfacial reaction between Ni and Al during rapid heating in a nanocalorimeter
Michael D. Grapes,
Thomas LaGrange,
Karsten Woll,
Bryan W. Reed,
Geoffrey H. Campbell,
David A. LaVan,
Timothy P. Weihs
Affiliations
Michael D. Grapes
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
Thomas LaGrange
Lawrence Livermore National Laboratory, Materials Science and Technology Division, Livermore, California 94550, USA
Karsten Woll
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
Bryan W. Reed
Lawrence Livermore National Laboratory, Materials Science and Technology Division, Livermore, California 94550, USA
Geoffrey H. Campbell
Lawrence Livermore National Laboratory, Materials Science and Technology Division, Livermore, California 94550, USA
David A. LaVan
Material Measurement Laboratory, Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
Timothy P. Weihs
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
The Al/Ni formation reaction is highly exothermic and of both scientific and technological significance. In this report, we study the evolution of intermetallic phases in this reaction at a heating rate of 830 K/s. 100-nm-thick Al/Ni bilayers were deposited onto nanocalorimeter sensors that enable the measurement of temperature and heat flow during rapid heating. Time-resolved transmission electron diffraction patterns captured simultaneously with thermal measurements allow us to identify the intermetallic phases present and reconstruct the phase transformation sequence as a function of time and temperature. The results show a mostly unaltered phase transformation sequence compared to lower heating rates.
