Size dependence and associated formation mechanism of multiple-fold annealing twins in nanocrystalline Cu

被引：31

作者：

Cao, Z. H. ^{[1
]}

Xu, L. J. ^{[1
]}

Sun, W. ^{[2
]}

Shi, J. ^{[1
]}

Wei, M. Z. ^{[1
]}

Pan, G. J. ^{[1
]}

Yang, X. B. ^{[2
]}

Zhao, J. W. ^{[2
]}

Meng, X. K. ^{[1
]}

机构：

[1] Nanjing Univ, Coll Engn & Appl Sci, Natl Lab Solid State Microstruct, Inst Mat Engn, Nanjing, Jiangsu, Peoples R China

[2] Nanjing Univ, Sch Chem & Chem Engn, State Key Lab Analyt Chem Life Sci, Nanjing, Jiangsu, Peoples R China

来源：

ACTA MATERIALIA | 2015年 / 95卷

基金：

中国国家自然科学基金;

关键词：

Multiple-fold twins; Formation mechanism; Size effect; Nanocrystalline; Annealing; MOLECULAR-DYNAMICS SIMULATION; FIVEFOLD DEFORMATION TWINS; CENTERED-CUBIC METALS; GRAIN-GROWTH; MAXIMUM STRENGTH; RATE SENSITIVITY; FCC METALS; DISLOCATION; COPPER; NUCLEATION;

D O I：

10.1016/j.actamat.2015.05.036

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The formation mechanisms and grain size dependence of annealing coherent multiple-fold twins, such as twofold and fivefold twins, were investigated in nanocrystalline Cu with zero applied stress by a combination of transmission electron microscopy and molecular dynamics (MD) simulation. It was found that the formation frequency of twofold and fivefold twins with coherent twin boundaries (CTB) increases with decreasing grain size (d), reaching a maximum frequency at the critical size of 35 nm, followed by a reduction at d < 35 nm. Numerous stacking faults (SFs) ribbons are also observed and associated with the formation of multiple-fold twins. Dislocation mediated grain rotation and SFs overlapping become the dominant formation mechanisms of multiple-fold twins, which are demonstrated by experiment and MD simulation. The competition between grain growth by GB migration and the transformation of GBs to intersectant CTBs via grain rotation causes the inverse grain size dependence. (C) 2015 Acts Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：312 / 323

页数：12

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