Deformation and Fatigue of Lightweight Magnesium Alloys
报告题目：Deformation and Fatigue of Lightweight Magnesium Alloys
报 告 人：陈道伦 博士
加拿大工程院院士、瑞尔森大学首席教授
西南大学海外名师
时 间：2018年12月12日（周三） 下午15:00
地 点：西南大学21教105会议室
报告摘要：The titles of “Vehicle Lightweighting is an Automotive Game-Changer; “Lightweighting is Top Priority for Automotive Industry; “Lightweighting is the No.1 Challenge Facing Automotive Engineers Today”, etc., have recently grabbed the headlines. Vehicle lightweighting is nowadays recognized as one of the leading strategies to improve fuel efficiency and reduce anthropogenic climate-changing, environment-damaging, costly, and human death-causing emissions, since every 10% reduction in weight can bring about 6~8% increase in fuel efficiency. Magnesium alloy, as an ultra-lightweight structural material, has the potential to reduce component weight up to 70%. However, the hexagonal close-packed crystal structure of magnesium alloys limits the availability of slip systems and leads to strong mechanical anisotropy and tension-compression yield asymmetry due to the presence of twinning and the related deformation texture. For the components subjected to dynamic cyclic loading, such asymmetry could play an unfavorable part in the material performance and compromise the structural integrity, safety, and durability of highly-loaded structural components. This issue could be surmounted through weakening the basal texture via the addition of rare-earth (RE) elements and grain refinement. In this talk a few examples on the cyclic deformation behavior of extruded magnesium alloys containing both high and low RE contents will be presented in comparison with RE-free extruded magnesium alloys. Moreover, twinning, twin growth, and twin-twin interactions during uniaxial compression in the extrusion direction and de-twinning in the transverse direction will be discussed as well.
报告人简介：
Dr. Daolun Chen, Fellow of Canadian Academy of Engineering (FCAE, 加拿大工程院院士), Fellow of Canadian Institute of Mining, Metallurgy and Petroleum (FCIM, 加拿大矿业，冶金和石油协会会士), and Fellow of the Institute of Materials, Minerals and Mining (FIMMM, 英国材料，矿物和采矿协会会士), is a Professor in the Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, Canada. He received his BSc and MSc from Northeastern University in 1983 and 1986, respectively, PhD from Institute of Metal Research, Chinese Academy of Sciences, 1989, and Dr.rer.nat. from the University of Vienna, Austria, 1993. Dr. Chen has published 378 refereed journal (298) and conference (80) papers in the area of advanced materials and key engineering materials, and their deformation, fatigue, welding and joining, plus over 190 non-refereed conference papers/research reports. His pioneering work on nanocomposites leads to a well-known method that bears his name, and is twice identified by the Council of Canadian Academies to be one of the top 1% most highly cited papers in his field worldwide. He is a recipient of Premiers Research Excellence Award, Natural Sciences and Engineering Research Council of Canada (NSERC) DAS Award, MetSoc Award for Research Excellence, MetSoc Distinguished Materials Scientist Award, and Sarwan Sahota Distinguished Scholar Award. Dr. Chen is an Associate Editor or Editorial Board Member of 30 journals, including Materials Research Letters, Materials and Design, Materials Science and Engineering A, etc. He has been invited by science reporters to give interviews and comments on some key scientific breakthroughs published in the journals of Nature and Science. More information could be seen on his web site at https://people.ryerson.ca/dchen/biography.html.