Day 1 :
Keynote Forum
Rafal Abdank-Kozubski
Jagiellonian University in Krakow, Poland
Keynote: Chemical ordering phenomena in nanostructured FePt: Monte Carlo simulations
Time : 09:20-09:55
Biography:
Rafal Kozubski has completed his PhD from the Jagiellonian University in Kraków in 1984. He has worked as a Post-doctorate at the Strasbourg Institute of Physics and Chemistry of Materials (IPCMS), France (1987 to 1988). He was an Academic Visitor in the Institute for Applied Physics, Swiss Federal Institute of Technology, Zurich, Switzerland (1988 and 1990). He also stayed at the Institute for Solid State Physics, University of Vienna, Austria as a Lise-Meitner Fellow from 1993 to 1995. After completing his Habilitation (DSc) from the Jagiellonian University in Kraków in 1997, he has worked there as an Associate Professor (1997-2006) and in 2006, he was appointed as Full Professor at the same university. His international experience includes International Fellowship at the Queen’s University in Belfast (2006-2008) and Visiting Professorships at the L.Pasteur University in Strasbourg/University of Strasbourg, France (2007, 2008, 2009, 2010 and 2011). In 2016, he was appointed as a Conjoint Professor of the University of Newcastle, Australia. He has published over 100 scientific papers in international reviewed journals and is an author of over 150 communications on international conferences.
Abstract:
Monte Carlo (MC) simulation studies of free-surface-induced selective destabilization of L10 superstructure variants in FePt nanolayers, nanowires and nanoparticles were carried out. The system was modeled with nn and nnn interatomic pair interactions deduced from ab initio results for Fe-Pt. The heterogeneous nucleation of a- and b-L10 variant domains reported previously for FePt nanolayers was induced by the (100)-type surfaces limiting the nanostructures. While the initial c-variant L10 superstructure of nanowires transformed totally to the L10 a-variant with Fe and Pt monoatomic planes perpendicular to the wire axis and to both (010) and (001) surfaces, in the case of nanocubes the competition between the a- and b-variant L10 domains nucleating at the (100), (010) and (001) surfaces resulted in suppression of their growth. As a consequence, most of the cube volume remained untransformed and showed the c-variant L10 chemical long-range order (LRO) with a degree lowered by homogeneously creating antisite defects. The results quantified by the calculated a- and b-L10 domain penetration depth and the LRO and SRO degree in particular cases are important for the development of magnetic storage media technologies requiring stable L10 superstructure variants determining easy magnetization directions.
Keynote Forum
Pradeep K. Rohatgi
University of Wisconsin-Milwaukee, USA
Keynote: Development of self-healing metallic materials and composites
Time : 09:55-10:30
Biography:
Pradeep K. Rohatgi, is a Professor of Materials Engineering, and Director of the Center for Composites at the University of Wisconsin-Milwaukee. He is a pioneer in the field of composite materials, particularly metal matrix composites. Dr. Rohatgi has coauthored twelve books and over 400 scientific papers. He has 20 U.S. patents and has received numerous awards for excellence in research. He has received numerous awards for excellence in research and has been elected to fellowships of several organizations including TMS, ASM, ASME, SAE, TWAS, SME, AAAS, MRS. His initial research on cast metal composites has been listed as a major landmark in the 11000 year history of metal casting and TMS has organized an honorary symposium to honor his contribution to metal matrix composites. Recently he has extended his work to make matrix nano composites, syntactic foams, self-lubricating and self-healing metal matrix composite castings.
Abstract:
Self-healing materials are inspired from natural biological materials that they can heal themselves when injured or bleed. All complex biological organisms have the ability to repair minor damage. Incorporating the self-repair function into inorganic systems is seeing growing interest of materials scientists. Most recent studies were concentrated on polymers and ceramics because it is easier to synthesize them than metallic materials. It can be classified the self-healing materials into two titles: autonomous self-healing materials and non-autonomous self-healing materials. Grain boundary migration, self-healing of nano-voids at the nanoscale repairing can be evaluated as autonomous self-healing. Non-autonomous self-healing is required an external driving force such as heating. Most recent studies about the self-healing metals and metal matrix composites are non-autonomous healing. Most of the studies were performed on the aluminum alloy, zinc alloy and Sn-Bi alloys about the self-healing metallic materials. Self-healing metals and metal matrix composites can be categorized by shape Memory Alloy (SMA) based healing, microencapsualtion based healing and precipitation healing. An approach to obtaining self-healing castings is made by incorporating shape memory alloy (SMA) reinforcements in a cast matrix. Another proposed mechanism is to incorporate a low melting alloy within hollow microcapsules that are embedded in a high melting alloy. An advancing crack breaks the microcapsule, allowing the low melting alloy to be liquefied and flow into the crack. Self-repairing capabilities can also be imparted to metal castings by aging precipitation during casting the alloy which provides closure of voids making stronger materials preventing the formation of initial cracks. Self-healing metallic materials are very promising for future. But currently, it has several constraints for practical application. It has needed developing new self-healing agents or mechanisms to resist high temperature. Researches are continuously improving self-healing metallic materials in order to use this material in near future.
Keynote Forum
Kim Meow Liew
City University of Hong Kong, Hong Kong
Keynote: Nanocomposite materials: Trends and challenges
Time : 10:30-11:05
Biography:
K M Liew is the Head of Department of Architecture and Civil Engineering and Chair Professor of Civil Engineering, City University of Hong Kong. Earlier, he was appointed as the Chair Professor of Building and Construction, City University of Hong Kong, a tenured Professor at Nanyang Technological University, Singapore and the Founding Director of Nanyang Center for Supercomputing and Visualization. He was a Visiting Professor of MIT, University of Southern California, University of Toronto and Tsinghua University. His research interests encompass computational mechanics, materials modeling, nanotechnology, plates and shells, engineering optimization and fire simulation. Over his academic career, he has published over 700 SCI journal articles. He is listed by the Institute for Scientific Information (ISI) as a Highly Cited Researcher in Engineering. His publications have been cited over 22000 times and his current H-index is 75 (Google Scholar).
Abstract:
Carbon nanotubes (CNTs) have found to possess high strength and stiffness as well as high aspect ratio and low density, making them a strong candidate for the reinforcement in polymer composites. Existing research has reported that the mechanical and physical properties of CNTs are superior to those of carbon fibers. Therefore, in recent years, CNTs have been used for the reinforcement in composite, forming the CNT-reinforced composite. This CNT-reinforced composite can be used in the form of beam, plate or shell structural component. With the increasing research works devoted to this topic, it will be important to know the current trends and challenges of nanocomposite materials.
Coffee Break - 11:05-11:30 @ Foyer
Keynote Forum
Lu-Wen Zhang
Shanghai Jiao Tong University, China
Keynote: Carbon nanocomposites and materials
Time : 11:30-12:05
Biography:
Dr. Zhang is the Distinguished Research Professor of mechanics in Shanghai Jiao Tong University. She received her PhD in 2010 from Shanghai University and continued her postdoctoral study in Shanghai University and City University of Hong Kong. Dr. Zhang’s main research trust is focused on computational mechanics, multi-scale modeling, Nano composite materials and optimization. Her research areas are on theoretical development and application of numerical algorithms and computational methods for problems in mechanics and nano materials. Dr. Zhang has published over 70 SCI journal articles and her publications have been cited over 1,200 (ISI). Her current h-index is 19 (ISI). She is Editor of Journal of Modeling in Mechanics & Materials (De Gruyter), Guest Editor on a Special Issue of Mathematical Problems in Engineering Journal (Hindawi Publishing) on Computational Methods for Engineering Science in 2014, and Editorial board member of Polymer Science (iMedPub).
Abstract:
Understanding the mechanical behavior of nanocomposites and materials remains one of the most difficult challenges in the field of material science. In this talk, we will present a multi-scale framework for computational modeling of the mechanical behavior of carbon nanotube (CNT) reinforced cement composites. The geometry of a cylindrical representative volume element (RVE) of composites is considered in which the CNT and matrix are used as elastic continua. In a macroscopic scale treatment, reinforcement is assumed to be embedded in the overall domain in the corresponding volume fraction. Accounting for the volume fraction, orientation and arrangement of the reinforcing components, CNTs and a matrix are simulated by different nonlinear constitutive models to represent the composites; CNTs are considered as one-dimensional and distributed in a uniform orientation. A mesoscopic scale description is considered in order to depict the mesostructured morphology of the reinforced composites and the bond-slip of its mutual interaction. Two length-scale systems of equations are coupled together using a staggered technique and the modified Newton-Raphson method is adopted to solve the nonlinear system equations in order to track the full load-displacement path of the composites. Several carefully selected case studies and benchmark problems will be presented in the talk.