通知公告

当前位置: 首页 > 通知公告 > 正文

通知公告

【前沿讲坛】日本京都大学Nobuhiro Tsuji教授讲座信息

来源:      发布时间:2019-08-12     点击量:

讲座题目:Fully Recrystallized Bulk Nanostructured Metals for Managing Both High Strength and Large Ductility

 

讲座人:Prof. Nobuhiro Tsuji

     Department of Materials Science and Engineering

     Kyoto University, Japan

 

地点:西二楼A204,曲江校区

 

时间:2019816日(星期五),上午10:00

 

摘要: 

Bulk nanostructured metals (or ultrafine grained (UFG) metallic materials), of which mean grain size of the matrix is smaller than 1 μm, usually perform surprisingly high strength, high fatigue strength and good low-temperature toughness, but their tensile ductility, especially uniform elongation, is limited in many cases. This is attributed to the early plastic instability caused by high flow stress and limited strain-hardening capability of the UFG materials. Therefore, an important strategy for managing both strength and ductility in nanostructured metals is to increase the strain-hardening capability by controlling microstructures, such as, dispersing nano-particles in the UFG matrix, making the nanostructure multi-phased, etc. Nanostructures fabricated by severe plastic deformation (SPD) naturally have characteristics of deformation structures. This is one of the main microstructural reasons of limited ductility, as strain-hardened metals usually do not show large tensile elongation. In order to remove the deformed characteristics, annealing processes are usually applied. But in many cases of the SPD processed materials, the mean grain size becomes over 1 μm after fully annealed microstructures are obtained, so that the strength decreases very much. Recently, on the other hand, we have succeeded in obtaining fully recrystallized nanostructures in some alloys. The materials show both high strength and enough strain-hardening ability, resulting in large uniform elongation. All these ways to manage strength and ductility will be presented in the lecture. 

 

报告人简介:

Nobuhiro Tsuji received his Bachelor, Master and PhD degrees from Department of Materials Science and Technology, Kyoto University, Japan in 1989, 1991, and 1994, respectively. He worked in Osaka University from 1994 to 2009, during which he developed the accumulative roll bonding (ARB) process with his colleagues that is known as a severe plastic deformation process applicable to continuous production of large bulk nanostructured materials. He has been working as a full professor at Department of Materials Science and Engineering in Kyoto University since March 2009. His research interests include structural metallic materials, bulk nanostructured metals, microstructure and mechanical properties of materials, metal working process, physical and mechanical metallurgy. Total citations for his 377 papers have reached over 13,000 times and the h-index is 50 so far (according to publons on August 7, 2019).

 

(此讲座可盖章)

 

关闭

关注我们

官方微信

地址:曲江校区——陕西省西安市雁塔区雁翔路99号十大正规足球外围网站曲江校区西二楼

          创新港——中国西部科技创新港19号巨构

邮编:曲江校区——710054      创新港——712046

网站:www.irockefeller.com ©2023 版权所有:「推荐一下」十大正规的足球外围网站(2023已更新)
站点建设与维护: 网络信息中心 陕ICP备06008037号-5

Baidu
sogou