Woodruff School of Mechanical Engineering
Mechanics of Materials Seminar
Multi-field-mapping informed alloy design for enhanced damage-resistance & healability
Dr. C. CEM TASAN
Massachusetts Institute of Technology
Thursday, June 2, 2016 at 11:00:00 AM
MRDC Building, Room 4211
The mechanical response of advanced alloys is governed by the microscopic strain and stress partitioning behavior among microstructural constituents. Yet, due to limitations in the characterization of the partitioning that takes place at the sub-micron scale, microstructure optimization of such alloys is typically based on evaluating the averaged response, referring to e.g. macroscopic stress-strain curves. Here, a novel experimental–numerical methodology is introduced to strengthen the integrated understanding of microstructure and mechanical properties, enabling joint analyses of deformation-induced evolution of the microstructure, and the strain and stress distribution therein, down to sub-micron resolution. This integrated computational materials engineering (ICME) approach provides vast amount of well-correlated structural and mechanical data that enhance our understanding and design capabilities of multi-phase alloys. More specifically, we apply this approach to better understand physical mechanisms of transformation, plasticity, damage and healing in complex multi-phase alloys. In turn, novel microstructure design concepts are developed that deliver superior strength and damage-resistance at decreased alloying and density. These include nanolaminate steels (Wang et al., Acta Materialia, 2015), dual phase high entropy alloys (Li et al., Nature, 2016), TWIP high entropy alloys (Deng et al., Acta Materialia, 2015) as well as others.
Prof. C. Cem Tasan is since January 2016 the Thomas B. King Career Development Professor of Metallurgy, in the Dept. of Materials Science and Engineering at MIT. He received his BSc and MSc degrees from the Metallurgical and Materials Engineering Dept. of METU, Ankara/Turkey. He then moved to Eindhoven/Netherlands, to carry out his PhD within the group of Prof. Marc Geers in the Mechanical Engineering Dept. of Eindhoven University of Technology. Following his PhD degree in 2010 he moved to Dusseldorf/Germany, for a 2-year post-doc position with Prof. Dierk Raabe in Max-Planck-Institut fur Eisenforschung. He was then appointed in MPIE as a Group Leader, leading the Adaptive Structural Materials group until joining MIT in 2016. Prof. Tasan’s research explores the boundaries of physical metallurgy, solid mechanics, and analytical (in-situ) microscopy, in order to provide game-changing materials solutions to environmental challenges. His research activities have led to 40+ journal publications, 60+ talks in various international conferences and meetings (20+ of which are invited lectures), collaborative research projects with leading research groups in France, Germany, Japan, Korea, Netherlands and USA, and various awards and grants including the Volkswagen ‘Freigeist’ Award in 2015
Refreshments will be served.