办公平台 | 所内邮箱 | ARP | English
当前位置: 首页 > 科研成果 > 学术活动 > 学术报告
[极端室学术论坛(47)] Stress breaks universal aging behaviour in a bulk metallic glass
时间: 2019年12月16日 14:30
地点: 物理所D楼211会议室
报告人: Prof.Robert Maass

Department of Materials Science and Engineering

University of Illinois at Urbana-Champaign

报告摘要

Subjecting a metallic glass to increasing temperature leads to thermally-activated relaxation dynamics that is well described with monotonously decreasing relaxation times. Similarly, relaxation times are known to increase as a function of waiting time (aging) at a given temperature. Here we use x-ray photon correlation spectroscopy (XPCS) to reveal how the structural dynamics of a prototypical Zr-based metallic glass changes due to internal residual stresses or applied stresses.

Our findings are discussed in the context of pre-yield structural excitations, structural relaxation and rejuvenation, as-well as mesoscopic effects of shear banding during plastic flow.

报告人简介

Robert Maass received a triple diploma in Materials Science and Engineering from the Institut National Polytechnique de Lorraine (INPL-EEIGM, France), Luleå Technical University (Sweden) and Saarland University (Germany) in 2005. In 2009, he obtained his PhD from the Materials Science Department at the École Polytechnique Fédérale de Lausanne (EPFL) in Switzerland. During his doctoral work, Robert designed and built an in-situ micro-compression set-up that he used to study small-scale plasticity with time-resolved Laue diffraction at the Swiss Light Source. From 2009-2011 he worked as a postdoctoral researcher at the Swiss Federal Institute of Technology (ETH Zurich) on plasticity of metallic glasses. Subsequently, he joined the California Institute of Technology as an Alexander von Humboldt postdoctoral scholar to continue his research on plasticity of metals. After working as a specialist management consultant for metals at McKinsey & Co., he transferred to the University of Göttingen as a junior research group leader. He joined the faculty of the University of Illinois at Urbana-Champaign as Assistant Professor of Materials Science and Engineering in 2015. His research interests include microstructure-property relations, size effects, strain localization and defect structures of amorphous and crystalline metals, defect dynamics, mechanical properties, microplasticity, glass transition phenomena, and test system development. His honors include the Young Scientist Award from the German Materials Society, an Alexander von Humboldt Fellowship, the prestigious Emmy Noether award from the German Research Foundation, the NSF Career Award, the TMS Young Leaders Award, the TMS Emerging Leaders Alliance Award, the American Society for Nondestructive Testing Award, and the Masing Memorial Medal from the German Materials Society.

邀请人:孙永昊

联系电话:82649303


网站地图 菲律宾申博在线管理网登入 申博太阳开户优惠登入 申博手机怎么充值登入
澳门赌场登入 申博太阳城138官网 申博正网开户 澳门新葡京赌场官网
ag国际馆娱乐平台 牡丹娱乐登入 手机彩票888直营网 皇冠网在那博彩网
申博真钱斗地主游戏登入 申博龙虎登入 百家乐支付宝充值登入 太阳成娱乐成总代理登入
太阳城在线存款登入 申博138微信支付充值登入 申博游戏手机怎么下载登入 777老虎机微信支付充值登入
rp138.com 758XTD.COM 66TGP.COM 33sbsun.com 2222ib.com
599BBIN.COM 788sj.com 598sj.com 298psb.com 116DC.COM
988xsb.com DC857.COM 1115118.COM 718jbs.com 288TGP.COM
591ib.com 22sbsun.com 129SUN.COM 687jbs.com XSB163.COM