材料学院青促会学术交流报告
Dr.Dong Liu Department of Materials University of Oxford
Title: InsituCharacterisation of the Mechanical Behaviour of Energy Materials under ExtremeConditions
地点：浙江大学玉泉校区曹光彪楼326会议室
时间：2017年07月18日（星期二） 10:00
邀请人：秦发祥
材料学院青年教师发展促进会承办
Abstract：
Materialswith multiplelength-scale structuresare a fascinating yet critical class of material that have characteristicdimensions spanning from nano- tomacro-scales. These materials have enormous potential for nuclear and energyapplications as they can display unique properties such as combinations ofstrength and toughness at ambient to elevated temperatures.
Takingnuclear-grade graphite as an example, which is a porousgraphite compositeused as the moderator and major structural component in UK power reactors, Iwill talk about mechanical testing under two extreme conditions: fastneutron irradiationand elevatedtemperatures(1000°C) using in situ micro-mechanical testing inside ascanning electron microscope and insitu hightemperature 3D X-ray computed tomography, respectively. It was found that thismaterial displays unusual higher strength and fracture toughness at elevatedtemperatures due to the relaxation of residual stresses.
Furtherexamples on the failure modes of several ceramic-basedcompositestested insitu atelevated temperatures up to 1200°C will be covered briefly.
BriefBio：
Dr.Dong Liu is currently a EPSRC (Engineering and Physical Sciences ResearchCouncil) Research Fellow, Royal Commission for the Exhibition of 1851 BrunelResearch Fellow, and Mansfield College Junior Research Fellow at the Universityof Oxford (UK), and a research affiliate to the Lawrence Berkeley National Lab(USA). She obtained her Ph.D. at the University of Bristol (UK) in 2012 on themeasurement of residual stresses and mechanical properties in environmental andthermal barrier coatings. She then worked as a postdoctoral researcher on thedeformation and fracture of quasi-brittle materials such as cement, gypsumplaster composites and nuclear graphite before moving to Oxford.
Hercurrent project is to challenge the insitumechanical testing on nuclear and energy materials at multiple length-scales(from micro- to macro-size), and under extreme conditions such as irradiationand elevated temperature. The materials of interest include graphite materialsand carbon composites, ceramic-based composites, MAX-phase ceramics,environmental and thermal barrier coatings, nano-structured steels and GaN-diamondcomposite materials for electronic devices.
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