Statistical mechanics principles applied to plasticity: compositional dependence of twinning, recrystallisation, and creep
Guest Speaker：Prof. Pedro Rivera Diaz Del Castillo, University of Southampton, UK
Inviter: Assoc.Prof. Yue LIU
Date&Time: Wednesday, 10 June, 15:30-16:30
Venue: Yiucheng Lecture Hall（500）,Xu Zuyao Building
Biography:
Professor Pedro Rivera Diaz Del Castillo is a Professor in Structural materials and GMP / Royal Academy of Engineering Research Chair (RAERC) in ‘Alloy and microstructure design for additive layer manufacturing (ALM)’at Southampton University, where he is also Professor in Structural Materials and Director of Research. Before this, he was Professor in Lancaster University, School of Engineering, and formerly Assistant Director of Research (Department of Materials Science and Metallurgy, University of Cambridge). Before 2009, he was tenured Assistant Professor at Delft University of Technology, Faculty of Aerospace Engineering. In 2013, he obtained the Vanadium Award from the Institute of Materials for his work on ally design. He has been a Nationally Recognized Researcher (SNI II) by the National Council of Science and Technology of Mexico (2012, 2016). He has received funding of £7M from recent grants, including: 1) RAERC in Alloy and Microstructure Design for ALM £1m, PI; 2) Advanced and novel microstructures for wire technology Bekaert £466k, PI; 3) Computer-aided design of revolutionary superalloys EC Horizon 2020, £86k, PI; 4) Increasing bearing life by combining a novel manufacturing bearing steel process with multiscale modelling techniques EPSRC £419k, Cambridge, PI. The majority of his funding has been directly awarded from industry. He has published over 188 articles in top scientific journals in the field of alloy design, including Acta Materialia and Materials and Design (https://scholar.google.com/citations?user=nrtz-loAAAAJ&hl=en).
Abstract:
Over the last 20 years we have developed a statistical mechanics theory to link transformational plasticity effects with composition. This presentations reviews some of the seminal ideas proposed originally by the author on statistical mechanics to describe creep and recrystallisation in pure metals; expanded to multicomponent systems, with key application on high-temperature nickel-based superalloys; and further on applied to twining in magnesium systems. Our recent efforts have focused on the description of dynamic and static recrystallization in alloys for additive manufacturing, including twinning during processing and mechanical testing of specimens subjected to laser powder bed fusion.
This work has permitted to explain and describe a wide range of systems starting with steels (low-carbon, stainless, and maraging steels); HCP alloys (magnesium and titanium, including the conditions for twinning); nickel-based superalloys to control high-temperature response and, of course, pure elements such as copper, iron, and magnesium.