Dislocation arrangements within slip bands during fatigue cracking

被引：32

作者：

Li, Linlin ^{[1
]}

Zhang, Zhenjun ^{[1
]}

Zhang, Peng ^{[1
]}

Li, Cuihong ^{[1
]}

Zhang, Zhefeng ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2018年 / 145卷

基金：

中国国家自然科学基金;

关键词：

Cu and Cu alloys; Slip band; Dislocations; Fatigue cracking; Strain localization; Lattice rotation; ELECTRON BACKSCATTER DIFFRACTION; COPPER SINGLE-CRYSTALS; CYCLIC DEFORMATION; STRAIN LOCALIZATION; GRAIN-BOUNDARIES; BEHAVIOR; CU; INITIATION; MICROSTRUCTURE; PROPAGATION;

D O I：

10.1016/j.matchar.2018.08.039

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microstructures and dislocations associated with the slip band (SB) fatigue cracks were investigated in Cu single crystal and bicrystal. It is found that there are high strain localizations with abundant dislocation cells around the cracked SBs. Due to the high local strain and slip irreversibility, the lattice rotates severely leading to large misorientation and hence low- or high- angle grain boundaries could form between the neighboring cells. Moreover, the dislocation walls can serve as preferential sites for nucleation and propagation of fatigue cracks with high density of dislocations, vacancies and high strain incompatibility.

引用

页码：96 / 100

页数：5

共 27 条

[1] THE DEPENDENCE OF DISLOCATION MICROSTRUCTURE ON PLASTIC STRAIN AMPLITUDE IN CYCLICALLY STRAINED COPPER SINGLE-CRYSTALS [J].

ACKERMANN, F ;

KUBIN, LP ;

LEPINOUX, J ;

MUGHRABI, H .

ACTA METALLURGICA, 1984, 32 (05) :715-725

[2] ANNIHILATION OF DISLOCATIONS DURING TENSILE AND CYCLIC DEFORMATION AND LIMITS OF DISLOCATION DENSITIES [J].

ESSMANN, U ;

MUGHRABI, H .

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1979, 40 (06) :731-756

[3] A MODEL OF EXTRUSIONS AND INTRUSIONS IN FATIGUED METALS .1. POINT-DEFECT PRODUCTION AND THE GROWTH OF EXTRUSIONS [J].

ESSMANN, U ;

GOSELE, U ;

MUGHRABI, H .

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1981, 44 (02) :405-426

[4] DISLOCATION CELL FORMATION IN METALS [J].

HOLT, DL .

JOURNAL OF APPLIED PHYSICS, 1970, 41 (08) :3197-+

[5] FATIGUE CRACK INITIATION AND GROWTH-BEHAVIOR OF CU-16 AT-PERCENT AL SINGLE-CRYSTALS [J].

HONG, SI ;

LAIRD, C .

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, 1991, 14 (2-3) :143-169

[6] QUANTITATIVE MEASUREMENT OF PERSISTENT SLIP BAND PROFILES AND CRACK INITIATION [J].

HUNSCHE, A ;

NEUMANN, P .

ACTA METALLURGICA, 1986, 34 (02) :207-217

[7] A TEM STUDY OF DISLOCATION-STRUCTURES IN FATIGUED CU-16 AT-PERCENT AL SINGLE-CRYSTALS [J].

INUI, H ;

HONG, SI ;

LAIRD, C .

ACTA METALLURGICA ET MATERIALIA, 1990, 38 (11) :2261-2274

[8] On the mechanistic basis of fatigue crack nucleation in Ni superalloy containing inclusions using high resolution electron backscatter diffraction [J].

Jiang, Jun ;

Yang, Jie ;

Zhang, Tiantian ;

Dunne, Fionn P. E. ;

Ben Britton, T. .

ACTA MATERIALIA, 2015, 97 :367-379

[9] Characterisation of strain localisation processes during fatigue crack initiation and early crack propagation by SEM-DIC in an advanced disc alloy [J].

Jiang, R. ;

Pierron, F. ;

Octaviani, S. ;

Reed, P. A. S. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2017, 699 :128-144

[10] EARLY STAGE CRACK TIP DISLOCATION MORPHOLOGY IN FATIGUED COPPER [J].

KATAGIRI, K ;

OMURA, A ;

KOYANAGI, K ;

AWATANI, J ;

SHIRAISHI, T ;

KANESHIRO, H .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1977, 8 (11) :1769-1773

← 1 2 3 →