时间:2015年11月13日(星期五)上午9:30
地点:大学城校区B5一楼会议室
报告摘要:
We summarize our recent works on the advanced metallic nanomaterials with exceptional dual mechanical properties using multiscale metallurgical structure-driven design combined with advanced mechanical simulation. The effect of nanostructured materials on the mechanical behavior and on the failure mechanism of metallic material shows the possibility to develop a new strength gradient composite. The computational models and experimental results successfully provide valuable information about the nanomaterials properties as a function nanostructure configuration (nanograins and nanotwins). The processing of nanomaterials using mechanical processing and heat treatment has been studied at nanoscale and atomic scale. With a detailed knowledge of the processing using high speed camera, we were able to accurately estimate the strain rate at different depths by analytical modeling and to study the correlation between the resulting microstructures and the strain/strain rate history of the material. The material studies using nanomechanics based experimental investigations (nanoindentation and nano-pillar tests) can reveal the effects of the atomic structure and nanostructure gradient on the mechanical behaviors. The failure mechanisms studies at nano-, micro- and macroscopic scale can provide efficient ways to enhance the ductility of materials using the general approach of strain non localization. We shall specially introduce the progress on the development of the high strength and high ductility industrial alloys with high density nano twinned stainless steels and TWIP steels. The potential applications in energy saving (light weight car), energy production (solar and nuclear) and energy storage will be presented. The integration of nanomaterials using advanced design tools with associated processing development will be introduced.
附报告人简介:
吕坚,法国国家技术科学院院士,香港城市大学机械工程学讲座教授, 副校长(研究与科技),周亦卿研究生院院长。研究方向涉及先进结构与功能纳米材料的制备和力学性能,机械系统仿真模拟设计。78年考入北京大学,经由教育部选拔于79年首批获国家奖学金公派赴法国贡比涅技术大学读大学本科, 86年获该校博士学位。93年获巴黎第六大学力学Habilitation文凭。曾任法国机械工业技术中心 (CETIM) 任高级研究工程师和实验室负责人。法国特鲁瓦技术大学机械系统工程系系主任, 法国教育部与法国国家科学中心(CNRS)机械系统与并行工程实验室主任,香港理工大学机械工程系系主任, 讲座教授,兼任香港理工大学工程学院副院长,香港城市大学科学与工程学院院长。曾任法国、欧盟和中国的多项重大或一般项目的负责人,并与空客,EADS,宝钢,安赛乐米塔尔,AREVA, ALSTOM, EDF, ABB,雷诺,标致等世界五百强公司有合作研究关系或为它们进行科学咨询工作。目前, 已取得16项欧,美,中专利(含拓展专利),在包括在本领域顶尖杂志Science, Nature Materials, Nature Communications, Advanced Materials, PRL, Acta Materialia, JMPS等SCI杂志上发表论文320余篇。曾任欧盟第五框架科研计划评审专家;欧盟第六框架科研计划咨询专家;中国科技部国际顾问组成员。中国国家自然科学基金委海外评审专家,中科院首批海外评审专家, 中科院沈阳金属所客座首席研究员,东北大学和北京科技大学名誉教授, 西安交通大学和西北工业大学顾问教授, 上海交通大学,上海大学,中山大学, 中南大学等大学客座教授, 中科院知名学者团队成员,2011年被法国国家技术科学院(NATF)选为院士,是该院298位院士中首位华裔院士。