Acta Materialia Symposium: Acta Materialia Award Session
Program Organizers: Carolyn Hansson, University of Waterloo
Tuesday 2:00 PM
March 16, 2021
Room: RM 12
Location: TMS2021 Virtual
2:00 PM
Introductory Comments: Acta Materialia Symposium: Carolyn Hansson1; 1University of Waterloo
Introductory Comments
2:05 PM Invited
Acta Materialia Gold Medal Lecture: Modeling Microstructure Complexity for Better Property Predictions: Günter Gottstein1; 1RWTH Aachen University
The discovery of X-rays 125 years ago enabled to reveal the internal structure of materials, as comprised by the spatial arrangement and distribution of elements as well as crystal defects, which we refer to as microstructure. A fundamental paradigm of physical metallurgy relates material properties to microstructure besides alloy chemistry. Research in the past century has generated a framework to quantitatively link microstructure to material properties. Since microstructure development during processing of a material is a complex and highly nonlinear phenomenon, the non-empirical prediction of material properties from the knowledge of processing history became only feasible with the advent of high-power computers. However, microstructural evolution proceeds by atomistic processes, which requires a deep understanding of the underlying physical mechanisms. This presentation will address essentials of respective approaches and challenges for microstructure modeling from conventional processing routes to increasingly complex material structures and modern material fabrication.
2:25 PM Invited
Acta Materialia Silver Medal Lecture: Measuring Hydrogen in Steels by Using Atom Probe Tomography: Julie Cairney1; 1The University of Sydney
Atom probe tomography is a powerful technique for the characterisation of materials. It provides beautiful 3D datasets that show the precise position and species of atoms within a needle shaped volume with a tip radius of ~100 nm. However, until recently, hydrogen in the atom chamber meant that it could not be used to accurately measure hydrogen. By using a custom-designed cryogenic transfer set-up, we have been able to obtain world-first 3D maps that show the distribution of hydrogen around the common microstructural features in steels. This work includes the first ever observations of hydrogen at dislocations, finally providing a concrete validation of the theory of hydrogen-enhanced dislocation mobility as a mechanism of hydrogen embrittlement. It also provides the first direct observations of hydrogen at the interface between incoherent precipitates and the surrounding steel matrix, settling a long-standing debate around whether hydrogen trapping is an interfacial effect (it is).
2:45 PM Invited
Acta Materialia Hollomon Materials and Society Award: Global Energy Challenges and Development of Thermoelectric Materials and Systems in China: Qingjie Zhang1; 1Wuhan University of Technology
This lecture presents the global energy challenges and Chinese strategy, the research activities and main progress on thermoelectric (TE) materials and recent development of TE applications in China. As a leading TE research group in China, we have recently made four important progresses as followings: (1) having discovered the multi-local effects coexistence mechanism of electric and thermal transport on the atomic and molecular scale and the superparamagnetic enhancement of thermoelectric performance; (2) having explored a novel self-propagating high-temperature synthesis technology that can realize the large-scale ultra-fast preparation of high-performance TE materials in less one minute; (3) having developed the solar energy photovoltaic(PV)-TE hybrid power generation technology that have been applied to have built two solar power generation demonstration systems with 5kW and 100kW; (4) having built an automotive waste heat TE power generation demonstration vehicle that can recover about 1000W electrical energy from the automotive exhaust.
3:05 PM Invited
Acta Materialia Mary Fortune Global Diversity Lecture: STEM Mentor Programs and New Opportunities for Women and Other Under- Represented Groups in the Materials Science: Katalin Balazsi1; ; 1Centre for Energy Research
Dr. Balázsi focused over 15 years of research activities in the area of nanocomposite thin films and bioceramics. In addition, her important activities are the promotion and representation of women in the materials science and engineering field. Science and gender equality are both vital for the achievement of the internationally agreed development goals, including the 2030 Agenda for Sustainable Development. The global community has made a lot of effort in inspiring and engaging women and under-represented groups in science. At present in Europe only around 30 % of all female students select STEM-related fields, especially in Hungary only 12%. In the presentation, the mentor programs will be highlighted to provide the methodological guidance with respect to under-represented groups for increasing the equality in material science and engineering.