A5024774065- Aluminum Alloys Composites Properties
- Intermetallics and Advanced Alloy Properties
- nanoparticles nucleation surface interactions
- High-Temperature Coating Behaviors
- High Entropy Alloys Studies
- Aluminum Alloy Microstructure Properties
- Graphene research and applications
- Metal and Thin Film Mechanics
- Solidification and crystal growth phenomena
- Advanced Materials Characterization Techniques
- High-Velocity Impact and Material Behavior
- Advanced ceramic materials synthesis
- Ionic liquids properties and applications
- Energetic Materials and Combustion
- Copper Interconnects and Reliability
- Semiconductor materials and interfaces
- Semiconductor materials and devices
- Advanced materials and composites
- Nanowire Synthesis and Applications
- MXene and MAX Phase Materials
- 3D IC and TSV technologies
- Photonic Crystals and Applications
- Advanced Chemical Physics Studies
- Electronic Packaging and Soldering Technologies
Technische Universität Ilmenau
2021-2025
Materials Science & Engineering
2022
Institute of Micro and Nanotechnology
2022
High entropy alloy films of AlCoCrFeNi B2-ordered structure are formed during an ultrafast heating process by reactive Ni/Al multilayers. The self-propagating high-temperature reaction occurring in multilayers after ignition represents heat source which is used for the transformation a thin Al/CoFe/CrNi multilayer into single-phase high film. materials design combined thus determines phase formation. Conventional rapid thermal annealing transforms film with multiple equilibrium phases....
Reactive multilayer systems are nanostructures of great interest for various technological applications because their high energy release rate during the self‐propagating reaction components. Therefore, many efforts aimed at controlling propagation velocity these reactions. Herein, reactive Al/Ni in shape free‐standing foils with a wavelike surface morphology prepared by using sacrificial substrates well‐aligned waves presented and along different directions reproduced is analyzed. During...
Abstract Reactive multilayer systems consisting of alternating nanoscale Al and Ni layers are applicable in joining, various pyrotechnic applications thermal batteries. Since diffusion based high-temperature synthesis occurs without the presence air, efforts have focused on investigating understanding fundamental reaction processes characteristics. The aim this study is to expose reactive multilayers extrinsic induced tensile stress so that self-propagating can proceed under these...
Abstract Fast energy release, which is a fundamental property of reactive multilayer systems, can be used in wide field applications. For most applications, self-propagating reaction and adhesion between the multilayers substrate are necessary. In this work, distinct approach for achieving reactions deposited Ni/Al silicon demonstrated. The surface consists random structures, referred to as grass, were created by deep ion etching. Using etching process, structure units heights 8 13 µm...
Reactive multilayer systems represent an innovative approach for potential usage in chip joining applications. As there are several factors governing the energy release rate and stored chemical energy, impact of morphology microstructure on reaction behavior is great interest. In current work, 3D reactive microstructures with nanoscale Al/Ni multilayers were produced by alternating deposition pure Ni Al films onto nanostructured Si substrates magnetron sputtering. order to elucidate...
The chemical energy released as heat during the exothermic reaction of reactive multilayer systems has shown potential applications in various technological areas, e.g., joining applications. However, controlling release rate and propagation velocity is required to enhance their performance most these Herein, a method control system presented. sputtering Al/Ni multilayers on substrates with periodic 2D surface structures promotes formation growth defects into system. This modification...
Surface structuring methods are crucial in semiconductor manufacturing, as they enable the creation of intricate structures on surface, influencing material's electrical, mechanical, and chemical properties. Herein, one such method known reactive ion etching to create black Si silicon substrates is employed. After thermal oxidation, their influence reaction Al/Ni nanoscale multilayers studied. It reveals distinct behaviors without corresponding differences energy release during differential...
Reactive multilayers comprising alternating nanoscale layers of Al and Ni exhibit potential across various applications, including localized heating for welding joining. Control over reaction properties is pivotal emerging such as chemical time delays or neutralization biological weapons. In this research, insights are offered into the intricate interplay between substrate thickness, surface roughness, behavior Al/Ni reactive multilayers, opening avenues tailored applications in domains. To...
Free‐standing Ni/Al multilayer films with a planar morphology, bilayer thickness of 20 nm, and an average composition Ni 50 Al (at%) deposited by direct current magnetron sputtering are investigated nanocalorimetry conventional calorimetry. Both the novel fast differential scanning calorimeter (FDSC) Flash DSC 2+ from Mettler–Toledo (MT) MT 3 used to cover range heating rates 0.1 10 4 K s −1 . A quantitative kinetic study interdiffusion phase reaction sequence is performed via Kissinger...
This work investigates the influence of a structured chip surface on propagation self-sustaining reaction that is aimed to be used as heat source for assembly. A silicon (100) was by combination thermal oxidation and dry wet etching obtain line structures with height lesser than 1 µm. To ensure 5 µm thick Al/Ni multilayers, SiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> insulator. Different widths lines valleys, ratio 1:1, were...
The influence of intentionally externally induced cracks in reactive Al/Ni multilayer systems is investigated. These affect the reaction dynamics and enable tailoring path overall velocity front. layer variations onto mechanical crack formation resulting behavior are High‐speed camera imaging shows meandering propagation front along paths. Therefore, cracking process significantly changes total thus offers a possibility to control self‐propagating high‐temperature synthesis process. It shown...
Al/Ni reactive multilayer systems (RMS) with a bilayer thickness of and total μm on SiO substrate exhibit self‐propagating reaction after ignition. A common method to initiate the is by electric spark Herein, RMS are ignited mechanical impact using various materials indeterminate geometries investigate basic mechanisms. 2 , glass, PMMA, resin‐bonded SiC particles used as impacting material different geometrical areas. The placed top impulse applied. ignition behavior subsequently evaluated...