Abstract
The rapid release of energy from reactive multilayer foils can create extreme local temperature gradients near substrate materials. In order to fully exploit the potential of these materials, a better understanding of the interaction between the substrate or filler material and the foil is needed. Specifically, this work investigates how variations in local properties within the substrate (i.e. differences between properties in constituent phases) can affect heat transport into the substrate. This can affect the microstructural evolution observed within the substrate, which may affect the final joint properties. The effect of the initial substrate microstructure on microstructural evolution within the heat-affected zone is evaluated experimentally in two Sn-Zn alloys and numerical techniques are utilized to inform the analysis.
Highlights
Reactive multilayer foils (RMF) are a class of materials that are being studied due to their ability to act as localized heat sources.[1,2,3,4,5,6,7,8] This makes them interesting for microelectronics applications where small, dissimilar and often temperature-sensitive components are being joined.[9]
Beyond the heat-affected zone (HAZ) boundary, the bulk microstructure remained unchanged from the as-cast morphology
This work explored the microstructural evolution that occurred in two Sn-Zn alloys as a result of the reaction of a neighboring Ni(V)-Al RMF heat source
Summary
Reactive multilayer foils (RMF) are a class of materials that are being studied due to their ability to act as localized heat sources.[1,2,3,4,5,6,7,8] This makes them interesting for microelectronics applications where small, dissimilar and often temperature-sensitive components are being joined.[9] These foils are formed by alternating submicron layers of elements, such as Ni and Al, that undergo a reaction when energy is input into the foil. Previous models that have been developed to (Received April 23, 2015; accepted July 16, 2015; published online August 5, 2015)
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