Professor Simon Ringer
Monday 3 July
9.45 - 10.25
New Insights into the Design of Nanoscale Microstructure via Atom Probe Microscopy
The atom probe microscope provides an increasingly flexible platform for high resolution mass spectrometry, field desorption microscopy, field ion microscopy and atom probe tomography. Significantly, by combining information from these modalities, it has recently become possible to discern local crystallographic information at very high resolution. This innovation changes the way that we use the instrument—from a tool that was primarily for microanalysis to one that serves as a holistic microscope. This lecture will present recent developments and applications in understanding severe plastic deformation where it is essential to combine local chemical and crystallographic information. A particular focus is on understanding solute engineering where controlled solute segregation to grain boundaries, coupled with intragranular solute clustering and second phase precipitation can be combined with nanostructured grain size to produce materials with exceptional properties.View biography.
Professor Simon Ringer is the University of Sydney’s Academic Director of Core Research Facilities, and Director of the Sydney Nanoscience Hub, which is the flagship building of the Australian Institute for Nanoscale Science and Technology. His is a Professor of Materials Science and Engineering in Sydney’s School of Aerospace, Mechanical & Mechatronic Engineering. Professor Ringer's research is about atomic-scale materials design. He studies how small groups of atoms in special architectures—atomic clusters—can create materials with remarkable properties. New combinations of electronic, magnetic, chemical and mechanical properties are being discovered with applications in semiconductors for photovoltaics and communications, catalysis and lightweight metals including aluminium alloys and advanced structural steels.
He has used SPD extensively as a key processing tool, and his research using atom probe microscopy has pioneered the frontiers of the hierarchical nanoscale microstructures in SPD materials, revealing new levels of complexity and opportunity.
He has worked in Sweden, Japan, the USA and Australia, and holds patents in the design of steels and nanomaterials. He has published over 300 papers and serves a materials engineering consultant to local and international industry. Professor Ringer is a Chartered Materials Professional and a Fellow of the Institution of Engineers Australia.
Dr Sergiy Divinski
Monday 3 July
14.00 - 14.40
Grain boundaries in severely deformed materials: structure, properties and thermal evolution
Recent advances in investigation of structure and properties of interfaces in severe plastically deformed (SPD) materials are reviewed. The results are critically analyzed as a function of the type of SPD treatment, induced defects and the deformation parameters (temperature, total strain and strain rate) for pure metals and alloys. A multi-level hierarchy of short-circuit diffusion paths is shown to be formed in ultrafine grained materials produced by SPD treatment. The key properties of deformation-modified grain boundaries, such as interface width, diffusion rate, extra free volume, are analyzed in detail. A model of the deformation-modified grain boundary state is presented. The interphase boundaries in severe plastically deformed Cu/Ni and Cu/Ta laminates are investigated with an emphasize on the effect of deformation-induced mixing of elements.View biography.
Dr. Sergiy Divinski is a Privat-Dozent at the Institute of Materials Physics, University of Münster, Germany, where he leads the radiotracer laboratory which represents one of the most reputed and internationally recognized diffusion schools. He teaches graduate and postgraduate courses on Diffusion in Solids, Numerical methods in Material Science and different aspects of Materials Science. He has co-authored more than 160 articles in various international journals, several book chapters in the field of Diffusion in Solids, and a textbook titled Thermodynamics, Diffusion and the Kirkendall Effect in Solids. Major research fields include diffusion in disordered and ordered intermetallics, diffusion and segregation at grain boundaries, effects of external fields on structure, kinetic and thermodynamic properties of metallic materials.
Professor Lei Lu
Tuesday 4 July
9.00 - 9.40
History-independent cyclic response of polycrystalline Cu with highly oriented nanosclae twins
Nearly 90% of service failures of metallic components and structures are caused by fatigue at cyclic stress amplitudes much lower than the tensile strength of the materials involved. A long-standing obstacle to developing better materials has been that metals typically suffer from large, accumulative, irreversible damages in microstructure during cyclic deformation, leading to history-dependent and unstable cyclic responses. In this study, through both experiments and atomistic simulations, we report a history-independent and stable fatigue response in a bulk polycrystalline Cu sample containing highly oriented nanoscale twins under sequences of stepwise increasing/decreasing plastic strain amplitudes. The results demonstrate that this unusual behavior is governed by a type of highly correlated necklace dislocations formed in the nanotwinned metal under cyclic loading. This unique fatigue mechanism is fundamentally distinct from traditional strain-localizing fatigue mechanisms associated with irreversible microstructural damage.View biography.
Dr. Lei Lu is a professor at the Institute of Metal Research, Chinese Academy of Sciences, where she received her PhD degree in 2000. Prof. Lu’s interests focus on the synthesis, microstructure characteristics and mechanical properties of nanostructured metallic materials, including nanograined, nanotwinned and gradient nanograined structures. She is a member of the International Committee on Nanostructured Materials and also serves as Editor of Acta Materialia and Scripta Materialia.
A/Professor Megumi Kawasaki
Tuesday 4 July
14.00 - 14.40
Fabrication of hybrid metal systems through the application of high-pressure torsion
The synthesis of new materials is now driven by technological issues combined with the restrictions imposed by ecological considerations in a variety of industrial applications. Light-weight metals are conventional structural metals having excellent physical and mechanical properties and with good strength-to-weight ratios in the finished products. Nevertheless, there may be an upper limit on the enhancement in mechanical properties when the processing is conducted directly on the alloy. Moreover, the fabrication of high-strength metals generally involves long-term processing conducted under extreme conditions using special facilities. Accordingly, this presentation demonstrates a simple and very rapid synthesis of metal matrix nanocomposites (MMNCs) in several Al hybrid systems which are achieved by processing stacked disks of the two pure metals by high-pressure torsion (HPT) at ambient temperature. These synthesized hybrid systems exhibit exceptionally high specific strength through rapid deformation-induced diffusion and the simultaneous formation of limited different intermetallic compounds. The experiments also show further improvement in mechanical properties is available by increasing the numbers of HPT turns and additional short-term annealing. These new experimental findings suggest a potential for simply and expeditiously fabricating a wide range of MMNCs through HPT.View biography.
Megumi Kawasaki is an Associate Professor in the Division of Materials Science & Engineering at Hanyang University, South Korea, where she joined the faculty as an Assistant Professor in 2012. Megumi obtained her B.Eng. degree in Metallurgy & Materials Science from Osaka Prefecture University in Japan in 2002 and then received an M.S. degree in 2004 and Ph.D. degree in 2007 in Materials Science at the University of Southern California, USA.
Her research interests lie in the area of the synthesis and characterizing the unique properties of hybrid ultrafine-grained and nanostructured materials processed by ECAP and HPT. She has collaborated actively with many researchers around the world and has published over 100 papers in peer-reviewed journals through her Ph.D. research and in the years after her Ph.D. She has received an Early Career Award from the Korean Institute of Metals and Materials (KIM) in April 2016. She is currently listed on ISI Web of Science with an h-index of 25.
Professor Jingtao Wang
Wednesday 5 July
9.00 - 9.40
New Opportunities in Restructuring of Materials by Deformation
NanoSPD --Bulk materials with stable grain and subgrain structures, typically at a scale in the range of ~50-500 nm, produced using Severe Plastic Deformation techniques—attractted extensive study in the last over thirty decades, leads to accumulation of huge results on processing techniques, exceptional grain refinement, and significantly enhanced the properties of materials as well as novel and/or unique properties. Meanwhile, in addition to microsturcuture refinement, such deformation processing brings new opportunities for resturcturing of materials at atomic scale, which makes it possible to produce new materials (phases) with different lattice structure and chemical structure from their parent materials. This is refered as Restructuring of Materials by Deformation (REMADE). New opportunities in REMADE will be discussed in this talk, together with examples such as: deformation driven atomic transportation that brings the formation of new phase in bulk metals, which is otherwise forbidden by slow thermodynamic atomic diffusion; achieving atomic scale homogenization in bulk through deformation mixing in sluggish diffusion alloy etc.View biography.
Dr. Jingtao Wang is a Professor in materials processing at Nanjing University of Science and Technology. He graduated with a Bachelor degree in 1982 and obtained a PhD degree in 1990, both from Northeast Polytechnic Institute, China. He has co-authored the first paper on SPD outside of Russia in 1993, and another well cited paper on the principles of ECAP in 1996. He continued his research on NanoSPD since then, and chaired NanoSPD5 together with Prof. T.G. Langdon in 2011. Prof. Wang’s research interests focus on Restructuring of Materials by Deformation (REMADE) and novel materials prepared to meet new challenges in extreme service environment. He recently developed the principle of tube high-pressure shearing (t-HPS) and explored new possibilities in REMADE, such as one-step synthesis of multilayered structures, high strength bulk nano-lamellar materials, and achieving atomic scale homogenization.
Prof. Wang leads the National Center for International Research on Micro & Nano Materials. The Center is equipped with 3D atom probe, Cs-correction TEM, helium ion microscope, Nano CT and other state-of-the-art characterization facilities, providing precise structural and chemical characterization from micro down to the atomic scale, and establishing international research environment for the materialization of creative ideas from all over the world.
Professor Sergey Dobatkin
Thursday 6 July
9.00 - 9.40
Strength, Corrosion Resistance, and Biocompatibility of Ultrafine-Grained Mg Alloys after Different Modes of Severe Plastic Deformation
The effect of different severe plastic deformation (SPD) techniques on the microstructure, mechanical properties, corrosion resistance, and biocompatibility in vitro of the WE43 (Mg-Y-Nd-Zr) alloy has been studied with the view of the improvement in its suitability for medical bioresorbable implant applications. The alloy was deformed by rotary swaging (RS), equal channel angular pressing (ECAP), and multiaxial deformation (MAD).
Microstructure examination showed that in all cases SPD led to the formation of ultrafine-grained (UFG) structure (0.5-1 µm) containing precipitates (~0.3 µm). SPD resulted in a significant increase in strength. ECAP and MAD also increase ductility, while RS provides the highest strength properties.
We investigated the corrosion properties (potentiodynamic test and tests for weight loss and hydrogen evolution). The presented SPD techniques don’t affect the electrochemical corrosion of the alloy, but significantly improves the chemical corrosion resistance.
Biocompatibility assays were performed in vitro upon incubation of the samples in erythrocyte suspension (hemolysis assay), mononuclear lymphocytes (cytotoxicity assessment), and a culture of multipotent mesenchymal stromal cells (cell proliferation assay). Evaluation of the biodegradation rate in the fetal bovine serum was also studied.
The work was supported by the Ministry of Education and Science of the Russian Federation (14.A 12.31.0001).View biography.
Prof. Sergey Dobatkin graduated from Moscow Steel and Alloys Institute in 1975. He obtained a PhD degree in 1979 and a DSci degree in 1990 from the same Institute. He is the head of the Laboratory of Physical Metallurgy of Non-Ferrous and Light Alloys in the Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences, a professor in the Department of Physical Metallurgy and Strength Physics in the National University of Science and Technology “MISIS”, and a lead researcher in the Laboratory of Hybrid Nanostructured Materials led by Prof. Y. Estrin.
Prof. S. Dobatkin participated in all NanoSPD Conferences. He was a member of the Organizing committee of the first NanoSPD in Moscow (1999), a plenary speaker in Moscow (1999), Fukuoka (2005) and Nanjing (2011), and an invited speaker in Goslar (2008) and Metz (2014).
His research interests focus on the formation of structural and phase states in ultrafine grained (UFG) materials using different methods of severe plastic deformation for simultaneous increase of strength and service properties. His work demonstrated the potential of these techniques for achieving favorable combinations of properties of various materials, including UFG copper alloys (electrical conductivity, fatigue, wear resistance), magnesium alloys (corrosion resistance, biocompatibility), low-carbon steels (fatigue, cold resistance, fire resistance, wear resistance).
Professor emeritus Tamas Ungar
Thursday 6 July
14.00 - 14.40
Characterization of UFG materials by X-ray and Neutron diffraction
Grain size, subgrain size, microstrain, dislocation density and dislocation types and intergranular strains determine the mechanical, chemical and other physical properties of submicron grain size materials produced by large plastic deformation. Different electron microscopy procedures are straightforward methods to determine the substructure features. However, dynamic properties, especially strains and stresses and number densities of different substructure element can be supplemented by X-ray and neutron diffraction methods. The synergy of electron microscopy and diffraction patterns provides a more comprehensive characterization of the substructure and a better understanding of the performance of ultra-fine-grain (UFG) materials. X-ray and neutron diffraction line profile analysis (LPA) proved to be a powerful tool for determining the sub-structure of crystalline materials in terms of (i) grain size or subgrain size, (ii) dislocation density and dislocation type, (iii) twinning and faulting and (iv) other types of lattice defects. The LPA procedure is based on physically modeled profile functions of the different microstructural elements and is available as a software package of convolutional multiple whole profile (CMWP) method. Dislocations within grains and in grain boundaries, competition between Taylor or Hall-Petch type strengthening and the inverse Hall-Petch behavior will be discussed in terms of different experiments and modelling.View biography.
Professor Tamas Ungar graduated in physics in 1966, obtained a PhD degree in 1974 at the Eötvös University Budapest in Hungary. He was awarded a Humboldt fellowship at the Max-Planck-Institute of Metallforschung in Stuttgart, Germany where he worked in the group of M. Wilkens from 1980 to 1982. Together with H. Mughrabi, T. Ungar discovered asymmetric X-ray line profiles related to long range internal stresses in dislocation cell structures, a direct evidence for the composite model of heterogeneous dislocation structures. He developed a dislocation model for strain anisotropy in diffraction line broadening and received the Hanawalt award by ICDD in 2007. T. Ungar has worked on stage IV work hardening and grain fragmentation together with the group of M. Zehetbauer.
With the same collaborators he showed that the grain size or subgrain size in the Hall-Petch concept alone cannot account for the mechanical properties of submicron grain size materials without considering the effect of dislocations in the substructure. He also conducted extensive line profile analysis of neutron diffraction at spallation neutron sources with high flux and high angular resolution. Prof. Ungar showed that alfa in Taylor's equation changes with the dislocation arrangement. He published over 220 research papers with more than 4000 independent citations and an h index of 42.
Dr Kavel Edalati
Friday 7 July
9.00 - 9.40
Severe Plastic Deformation in the Past
Severe plastic deformation (SPD) is currently considered as a potential process to generate nanograins in metallic and non-metallic materials. The new age of NanoSPD started in early 1990s when Russian scientists reported that the nanograined materials produced by SPD show exceptional structural and functional properties due to the large fraction of high-angle grin boundaries. The SPD process was popular centuries ago to fabricate metallic tools with high strength and good ductility. There were also interests in structural and microstructural evolutions of SPD-processed materials at least at the beginning of last century. This talk reviews some of the old activities on the SPD and summarizes their historical significance.View biography.
Kaveh Edalati obtained a PhD degree in Materials Physics and Chemistry from Kyushu University, Fukuoka, Japan, in 2010. He is currently an assistant professor in the Hydrogen Storage Research Division of the International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University. His main research interests include severe plastic deformation (SPD), phase transformations, and energy materials. He is the co-author of ~60 papers on SPD-related subjects.
- Key Dates
- Call for Abstracts Open 8 August 2016
- Registration Open 14 November 2016
- Call for Abstracts Close 20 January 2017
- Notification of Acceptance 30 January 2017
- Early-Bird Registration Close 15 March 2017
- Manuscript Submissions Close 15 March 2017
- Pre-Conference 1 July 2017
- NanoSPD7 Conference 2-7 July 2017