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11.1】Prof. Nobuhiro Tsuji
题目:Possibilities of Bulk Nanostructured Metals as...
 
2011-10-26 | 文章来源:非平衡金属材料研究部        【 】【打印】【关闭

题 目:Possibilities of Bulk Nanostructured Metals as Future Structural Metals

报告人:Prof. Nobuhiro Tsuji

    Department of Materials Science and Engineering

    Kyoto University, Japan

    nobuhiro.tsuji@ky5.ecs.kyoto-u.ac.jp

    http://www.tsujilab.mtl.kyoto-u.ac.jp/

时  间:11月1日(周二)上午9:30-11:00

地  点:李薰楼468房间

欢迎参加!

Abstract

Nanostructured metals composed of ultrafine grains (UFG) with sizes smaller than 1mm perform surprisingly high strength and other superior mechanical properties. In the seminar, the background of the studies on bulk nanostructured metals, including the processes to realize nanostructures, will be introduced first. Then the possibilities of bulk nanostructured metals as future structural materials are discussed. Bulk nanostructured metals sometimes show limited tensile ductility. In the present lecture, systematic experimental results on mechanical properties of the nanostructured steels with ferrite single phase are firstly shown. The limited tensile ductility of the nanostructured single-phase metals was due to very small uniform elongation, which was attributed to the early plastic instability in the UFG microstructures. This basic understanding suggests one of the ways to overcome the low tensile ductility: if the strain-hardening of the matrix is enhanced by any means, such as dispersing fine second phase in the matrix, both high strength and adequate ductility can be managed even in nanostructures. Actual examples of the nanostructured metals that could achieve good strength-ductility balance were also introduced. Dispersing fine second-phase within the UFG matrix was actually effective to manage both strength and ductility. Also ultrafine dual-phase structure in low-C steel composed of ferrite and martensite resulted in both high strength and large uniform elongation. It was also shown that transformation induced plasticity (TRIP) caused by deformation induced martensite transformation of metastable austenite could work in nanostructured steels. The present results clearly indicate that using multi-phases is the promising direction for managing both high strength and adequate ductility in nanostructured metals.

Bulk Nanostructured Metals Project:

http://www.bnm.mtl.kyoto-u.ac.jp/

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