TMS 2021 Annual Meeting & Exhibition, Pennsylvania, United States Of America, 15 March - 18 April 2021, pp.1
Reactive metallic nanolayers are nanolaminated structures composed of alternating layers of two metals. Thermally or mechanically-induced mixing of these pure metal layers results in the formation of an intermetallic alloy through an exothermic reaction. The associated high heat released causes a self-propagating combustion behavior. The high energy density and self-propagating nature of the metallic nanolayers make them suitable for challenging joining applications. In this work, we characterized the combustion behavior of free-standing Ni/Al nanolayers as well as nanolayers attached to a substrate through high-speed imaging and differential scanning calorimetry. Our findings indicate that the presence of a substrate and its thermal properties affect the combustion behavior considerably. The results show that the thermal properties of the parts to be joined are critical for the quality of the nanolayer-assisted joining process.