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4. Spinodal decomposition versus classical gamma-prime nucleation in a nickel-base superalloy powder: An in-situ neutron diffraction and atomic-scale analysis

Author

Collins, David M, D'Souza, Neil, Panwisawas, Chinnapat, Papadaki, Chrysanthi, West, Geoff D, Kostka, Aleksander, and Kontis, Paraskevas

Subjects
Condensed Matter - Materials Science
Abstract

Contemporary powder-based polycrystalline nickel-base superalloys inherit microstructures and properties that are heavily determined by the thermo-mechanical treatments during processing. Here, the influence of a thermal exposure alone to an alloy powder is studied to elucidate the controlling formation mechanisms of the strengthening precipitates using a combination of atom probe tomography and in-situ neutron diffraction. The initial powder comprised a single-phase supersaturated gamma only; from this, the evolution of gamma-prime volume fraction and lattice misfit was assessed. The initial powder notably possessed elemental segregation of Cr and Co and elemental repulsion between Ni, Al and Ti with Cr; here proposed to be a precursor for subsequent gamma to gamma-prime phase transformations. Subsolvus heat treatments yielded a unimodal gamma-prime distribution, formed during heating, with evidence supporting its formation to be via spinodal decomposition. A supersolvus heat treatment led to the formation of this same gamma-prime population during heating, but dissolves as the temperature increases further. The gamma-prime then reprecipitates as a multimodal population during cooling, here forming by classical nucleation and growth. Atom probe characterisation provided intriguing precipitate characteristics, including clear differences in chemistry and microstructure, depending on whether the gamma-prime formed during heating or cooling.

Published
2020
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9. Quantifying Electrochemical Degradation in Single-Crystalline LiNi0.8Mn0.1Co0.1O2 –Graphite Pouch Cells through Operando X-Ray and Postmortem Investigations

Author

Menon, Ashok S., primary, Shah, Nickil, additional, Gott, James A., additional, Fiamegkou, Eleni, additional, Ogley, Matthew J. W., additional, Páez Fajardo, Galo J., additional, Vaenas, Naoum, additional, Ellis, Ieuan, additional, Ravichandran, N., additional, Cloetens, P., additional, Karpov, D., additional, Warnett, J.M., additional, Malliband, Paul, additional, Walker, David, additional, West, Geoff, additional, Loveridge, Melanie, additional, and Piper, Louis F.J., additional

Published
2024
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11. Quantifying Electrochemical Degradation in Single-crystalline LiNi0.8Mn0.1Co0.1O2–Graphite pouch cells through Operando X-ray and Post-mortem Investigations

Author

S. Menon, Ashok, primary, Shah, Nickil, additional, A. Gott, James, additional, Fiamegkou, Eleni, additional, J. W. Ogley, Matthew, additional, J. Paez Fajardo, Galo, additional, Vaenas, Naoum, additional, Ellis, Ieuan, additional, Ravichandran, Nishitha, additional, Cloetens, Peter, additional, Karpov, Dmitry, additional, Warnett, Jay, additional, Malliband, Paul, additional, Walker, David, additional, West, Geoff, additional, Loveridge, Melanie, additional, and Piper, Louis, additional

Published
2023
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13. Characterization of metal-polymer interaction forces by AFM for insert molding applications

Author

Abhyankar, Hrushikesh, Webb, D. Patrick, West, Geoff D., and Hutt, David A.

Subjects
Metals -- Usage, Degassing of metals -- Usage, Thermoplastics -- Usage, Atomic force microscopy -- Methods, Molding (Chemical technology) -- Methods, Engineering and manufacturing industries, Science and technology
Abstract

There is a growing interest in the overmolding of electronics with thermoplastics and the embedding of electronics in 3D printed parts. However long term device reliability requires good adhesion between the metallic surfaces of the electronic components and the overmolding polymer. In order to provide a guide to material selection, interaction forces between tin, a common electronics metallization and six commodity thermoplastics were studied. The force measurements were undertaken using atomic force microscopy (AFM) with probes functionalized with tin particles. The particles were attached to the probes by a novel method using a focused ion beam (FIB) instrument. Highly consistent cantilever deflections at pull-off were obtained, allowing the thermoplastics to be robustly ranked by strength of interaction with tin as: PC > PMMA > PBT > ABS > PS > PA 6. From consideration of possible contributions to the pull-off forces measured, it was concluded the data and the developed AFM tip functionalization technique are likely to be useful in materials selection for electronics overmolding with thermoplastics. The FIB functionalization technique may be useful in the wider context of investigations of other metal-polymer interaction forces, for example with alloys, where other methods of functionalization may be difficult to apply. KEYWORDS adhesion, atomic force microscopy, atomic interactions, electronics, force-distance mode, functionalization, insert-molding, metal-polymer, 1 | INTRODUCTION The most common printed circuit board (PCB) substrate material, FR4, consists of an epoxy based resin with woven glass fiber reinforcement [1] and has been successfully used [...]

Published
2020
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25. CIAO-WPS - Utilizing Semantic Web (Web 3.0) Techniques to Assist in the Automatic Orchestration of Geospatial Processes and Datasets

Author

Tan, Chet Bing, McMeekin, David A., West, Geoff, Moncrieff, Simon, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kotenko, Igor, Series editor, Liu, Ting, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Grueau, Cédric, editor, Laurini, Robert, editor, and Rocha, Jorge Gustavo, editor

Published
2017
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26. SWRL Rule Development to Automate Spatial Transactions in Government

Author

Varadharajulu, Premalatha, Arnold, Lesley, McMeekin, David A., West, Geoff, Moncrieff, Simon, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kotenko, Igor, Series editor, Liu, Ting, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Grueau, Cédric, editor, Laurini, Robert, editor, and Rocha, Jorge Gustavo, editor

Published
2017
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36. Classifying Multiple Imbalanced Attributes in Relational Data

Author

Ghanem, Amal S., Venkatesh, Svetha, West, Geoff, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Nicholson, Ann, editor, and Li, Xiaodong, editor

Published
2009
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39. Visual Tracking and Localization of a Small Domestic Robot

Author

Sheh, Raymond, West, Geoff, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Nardi, Daniele, editor, Riedmiller, Martin, editor, Sammut, Claude, editor, and Santos-Victor, José, editor

Published
2005
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40. Interactive Knowledge Validation in CBR for Decision Support in Medicine

Author

Ou, Monica H., West, Geoff A. W., Lazarescu, Mihai, Clay, Chris, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Miksch, Silvia, editor, Hunter, Jim, editor, and Keravnou, Elpida T., editor

Published
2005
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41. User Friendly Decision Support Techniques in a Case-Based Reasoning System

Author

Ou, Monica H., West, Geoff A. W., Lazarescu, Mihai, Clay, Chris, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Webb, Geoffrey I., editor, and Yu, Xinghuo, editor

Published
2005
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42. Adaptive Model for Foreground Extraction in Adverse Lighting Conditions

Author

Greenhill, Stewart, Venkatesh, Svetha, West, Geoff, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Zhang, Chengqi, editor, W. Guesgen, Hans, editor, and Yeap, Wai-Kiang, editor

Published
2004
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43. Automatic Labeling of Sports Video Using Umpire Gesture Recognition

Author

Chambers, Graeme S., Venkatesh, Svetha, West, Geoff A. W., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Fred, Ana, editor, Caelli, Terry M., editor, Duin, Robert P. W., editor, Campilho, Aurélio C., editor, and de Ridder, Dick, editor

Published
2004
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44. Learning People Movement Model from Multiple Cameras for Behaviour Recognition

Author

Nguyen, Nam T., Venkatesh, Svetha, West, Geoff A. W., Bui, Hung H., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Fred, Ana, editor, Caelli, Terry M., editor, Duin, Robert P. W., editor, Campilho, Aurélio C., editor, and de Ridder, Dick, editor

Published
2004
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46. Comparing Shape and Temporal PDMs

Author

Tassone, Ezra, West, Geoff, Venkatesh, Svetha, Goos, G., editor, Hartmanis, J., editor, van Leeuwen, J., editor, Caelli, Terry, editor, Amin, Adnan, editor, Duin, Robert P. W., editor, de Ridder, Dick, editor, and Kamel, Mohamed, editor

Published
2002
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