Effect of grain refinement by ECAP on creep of pure Cu

被引：32

作者：

Blum, W. ^{[1
]}

Dvorak, J. ^{[2
]}

Kral, P. ^{[2
]}

Eisenlohr, P. ^{[3
]}

Sklenicka, V. ^{[2
]}

机构：

[1] Univ Erlangen Nurnberg, Inst Werkstoffwissensch, D-91058 Erlangen, Germany

[2] Acad Sci Czech Republ, Inst Phys Mat, CZ-61662 Brno, Czech Republic

[3] Max Planck Inst Eisenforschung GmbH, D-40237 Dusseldorf, Germany

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 590卷

关键词：

Cu; ECAP; Static recrystallization; Creep; Ductility; High-angle boundaries; DEFORMATION RESISTANCE; PLASTIC-DEFORMATION; COPPER; STRAIN; BOUNDARIES; TRANSITION; MODEL;

D O I：

10.1016/j.msea.2013.10.022

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The creep behavior of pure, initially coarse-grained Cu of 99.99% purity was investigated at a temperature of 473 K in tension and compression in dependence on predeformation by ECAP (route B-C) at ambient temperature. Static recrystallization during heating to test temperature generates a microcrystalline structure; its homogeneity increases with increasing ECAP-predeformation. The high-angle boundaries are sufficiently closely spaced to exert a significant influence on work hardening and quasi-stationary deformation where generation and loss of free dislocations are at approximate balance. This influence is quantitatively interpreted in terms of control of deformation resistance shifting from low- to high-angle boundaries as predeformation increases and creep stress decreases. The microcrystalline structure created by the thermomechanical treatment consisting of ECAP and static recrystallization leads to favorable combination of relatively high creep resistance and high ductility at 473 K with fracture strains in the order of 0.5. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：423 / 432

页数：10

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