Size dependence of rate-controlling deformation mechanisms in nanotwinned copper

被引：97

作者：

Lu, Lei ^{[1
,2
]}

Dao, Ming ^{[2
]}

Zhu, Ting ^{[3
]}

Li, Ju ^{[4
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

[2] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[3] Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30332 USA

[4] Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA

来源：

SCRIPTA MATERIALIA | 2009年 / 60卷 / 12期

关键词：

Twin boundary; Size dependence; Rate-controlling mechanism; Activation volume; STRAIN-RATE SENSITIVITY; COHERENT TWIN BOUNDARIES; CENTERED-CUBIC METALS; NANO-SCALE TWINS; NANOSCALE TWINS; ACTIVATION VOLUME; STRENGTH; NANOCRYSTALLINE; DUCTILITY; FCC;

D O I：

10.1016/j.scriptamat.2008.12.039

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nanotwinned metals exhibit an unusual combination of ultrahigh strength, considerable ductility and enhanced rate sensitivity. We find that a Hall-Petch-type relationship closely fits the experiment data of activation volume as a function of twin spacing. The results suggest a transition of the rate-controlling mechanism from intra-twin- to twin-boundary-mediated processes with decreasing twin lamellar thickness. These findings provide insights into the possible routes for optimizing the strength and ductility of nanostructured metals by tailoring internal interfaces. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1062 / 1066

页数：5

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