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学术动态

张善勇教授学术报告会通知

时间:2020年12月11日 11:55    来源:    作者:    阅读:

报告题目1Mechanical behaviors of nanostructured, dual phase CrCoNi medium-entropy alloy

报告时间:20201216日上午10:00-11:30

报告地点:公字楼339智慧教室或点击链接入会,或添加至会议列表:https://meeting.tencent.com/s/w5SKRjJzSTqQ会议ID234 492 783

报告人:张善勇教授

摘要:Alloy design of multiple principal elements in concentrated solid solutions has been revolutionising the development of advanced metallic materials.The mechanical size effect of nanostructured, dual-phase CrCoNi medium-entropy alloy (MEA) was investigated by combining in-situ micro-compression testing with post-mortem electron microscopy analysis. The alloy possesses a superior yield strength up to ~ 4 GPa, due primarily to its hierarchical microstructure. While the yield strength of the alloy has shown size-independency, the deformation behavior was strongly dependent on the sample size, changing from catastrophic shear banding to apparently homogeneous deformation with decreasing the pillar diameters. These findings provide insights into the criticality of sample dimensions in influencing mechanical behaviors of nanostructured metallic materials used for nanoelectromechanical systems. Despite considerable research effort, it remains unclear whether an exhaustive exploration in a nearly infinite compositional space of multiple principal elements can uncover new deformation mechanisms that enable the drastically enhanced performance of metallic alloys. With further investigation on the deformation mechanisms, we uncover a previously unknown phenomenon of mechanically-induced structural transformations from the face-centered cubic (FCC) to hexagonal close-packed (HCP) and then back to FCC phase in the CrCoNi MEA. Such dual phase transformations can produce a large shear strain up to 0.70, enabling extensive plastic shear in localized deformation bands at room temperature. The formation of deformation twins herein is realized by this dual phase transformation, distinctly different from the classical twinning mechanism of layer-by-layer formation of SFs in FCC crystals. Our findings underscore the notion that alloys with multiple principal elements can deliver unprecedented deformation mechanisms, such as dual phase transformations featuring the large shear, thereby opening new avenues to enhance the mechanical properties of advanced metallic alloys.

报告题目2How to get your papers published?

报告时间:20201216日下午14:30-16:30

报告地点:公字楼339智慧教室或点击链接入会信和在线 | 会员登录首页信和在线 | 会员登录首页,或添加至会议列表:https://meeting.tencent.com/s/F7XFWAHvtdlo会议ID173 889 656

报告人:张善勇教授

摘要:This talk focuses on how to construct a good paper from seasoned editor’s point of view. The talk concentrates on what should be in the title, how to write introduction, experimental and how to bring the results into conclusions. The talk presents along with a case study to help better understanding. It serves as very useful guidelines for research students and young professors in planning and writing technical papers. With these guidelines, writing a paper becomes as easy as “fill in the blanks”.

报告人简介:

张善勇教授:1984年获北京钢铁研究总院材料学硕士学位信和在线 | 会员登录首页,1991年获美国威斯康星大学材料学博士学位。1991年入职新加坡南洋理工大学信和在线 | 会员登录首页信和在线 | 会员登录首页,2006年升任终身正教授信和在线 | 会员登录首页信和在线 | 会员登录首页信和在线 | 会员登录首页。2007年入选英国材料学会会士(FIoMMM),2018年入选英国皇家化学学会会士(FRSC)和国际薄膜学会会士(FTFS)信和在线 | 会员登录首页。2018年张教授加盟西南大学材料与能源学部信和在线 | 会员登录首页信和在线 | 会员登录首页,组建“新薄膜材料与器件研究中心”并任中心主任。张教授是美国Nanoscience and Nanotechnology Letters创刊总编(2008-2015),Journal of Materials Research编委,Surface and Coatings Technology编委信和在线 | 会员登录首页,《国际薄膜学会》的创始人和现任会长/理事信和在线 | 会员登录首页信和在线 | 会员登录首页。

主要研究方向:硬质薄膜与涂层以及能源薄膜/太阳能电池信和在线 | 会员登录首页信和在线 | 会员登录首页。发表学术360余篇信和在线 | 会员登录首页信和在线 | 会员登录首页信和在线 | 会员登录首页,被引用10235次,H因子53。从事薄膜和涂层材料的制备与检测二十多年,编著科学专著13部信和在线 | 会员登录首页信和在线 | 会员登录首页信和在线 | 会员登录首页⌒藕驮谙?| 会员登录首页?痛嗉萍荚又?0多卷信和在线 | 会员登录首页。其中2008年由美国CRC出版社出版的Materials Characterization Techniques”(材料检测技术)已经被30多所顶尖欧美大学采纳为核心教材(core text)信和在线 | 会员登录首页,也被翻译为中文,由中国科学出版社出版发表。

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