Thermodynamic stabilization of iron-based nanoalloys

Frater, Theodore Edwin
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Lian, Jie
Lewis, Daniel J.
Duquette, D. J.
Ji, Wei
Shi, Yunfeng
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Materials engineering
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Nanomaterials possess a wide range of novel properties due to their small length scales, however fabricated nanostructures often undergo undesirable morphological growth phenomena due to the unstable thermodynamics of their inherently large interface area to bulk volume ratios. Typically, microstructural evolution are driven by the elimination of high energy interface areas, which results in deleterious nanoscale morphological transformations such as grain growth and thin film dewetting. Thermodynamic stabilization of interfaces by solute segregation offers the possibility to directly eliminate the destabilizing driving force by reducing the excess energy of interfaces. In this thesis we explore aspects of segregation induced thermodynamic stabilization of interfaces in Fe binary alloys for the purpose of retaining material property improvements attributable to normally unstable nanoscale structures. One aspect of the thesis will focus on the prediction of thermodynamically stabilized binary alloys and the grain size stabilization of electrodeposited nanocrystalline iron-rare earth alloys for suggested application in high-temperature, corrosion resistant metal matrix composites. The other aspect of this thesis is the study of ion induced dewetting for the purpose of providing observations of thermodynamic stabilization effects in thin film dewetting instabilities.
May 2015
School of Engineering
Dept. of Materials Science and Engineering
Rensselaer Polytechnic Institute, Troy, NY
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