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Meeting MS&T21: Materials Science & Technology
Symposium Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
Presentation Title Mechanisms of Hillock Formation and Nanostructural Self-assembly during Vapor-deposition of Phase-separating Alloy Films
Author(s) Rahul Raghavan, Kumar Ankit
On-Site Speaker (Planned) Kumar Ankit
Abstract Scope The formation of protruding grains, or hillocks, on the surface of nanostructured alloy films, is typically attributed to internal residual stresses arising due to a difference in thermal expansion coefficients of the film and the substrate. However, recent nanostructural characterization of phase-separated alloy films has indicated the role of disparate elemental mobilities which can contribute to the growth of hillocks. Given these findings, we report a 3D phase-field approach to numerically investigate the role of deposition rates, phase fraction, and separation kinetics, on the nanostructural self-assembly and growth of hillocks in immiscible alloy films. With the aid of n-point polytope analysis, we explore the processing conditions under which nano-sized hillocks evolve in arrays of distinguishable symmetries. Based on an extensive parametric study, we elucidate the influence of adatom mobility and surface contact angles on the hillock formation in vapor-deposited alloy films.

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Effect of Doping Carbon Nanotubes with Group III-V Compounds Using Floating Catalyst Method
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Growth Mechanism Study of Boron Carbide Nanowires
Low Temperature Synthesis of Metastable Tetragonal Yttria Doped Hafnia T-(Y-HfO2) Nanoparticles Through Mechanochemical Processing and Annealing
Mechanism Study of Controlled Growth of Transition Metal Oxide Nanostructures
Mechanisms of Hillock Formation and Nanostructural Self-assembly during Vapor-deposition of Phase-separating Alloy Films
Nanocrystalline Refractory Ceramic Synthesis Using High Char Polymers
Nanotube Consolidations and Metal-PTFE Nanocomposites for Conformable Thermal and Electrical Interfaces
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P1-32: Low Temperature Synthesis of Solvothermally Grown Ga2O3 Thin Films on FTO Substrates Enabling Various Functional Applications
Polymer-Derived Ceramic Nanocomposites for Applications at High Temperatures and in Harsh Environments
Polymer Derived Ceramics and Composites- From Nanoscale to Bulk Properties
Processing and Mechanical Properties of 3YSZ-Al2O3 Core-Shell Nanocomposite Ceramics
Self-Assembled Periodic Nanostructures of SrSnO3 Using Martensitic Phase Transformations
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Sintering, Structure, and Properties of Y2O3-ZrO2-Al2O3 Core-Shell Nanocomposite Ceramics
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Surface-engineered CeO2 Nanocrystals: Catalysis and Beyond
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Thickness-dependent Piezoelectric Property of Two-dimensional Zinc Oxide Nanosheets with Unit Cell Resolution
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