MICROSTRUCTURAL DEVELOPMENT DURING FATIGUE OF COPPER FOILS 20-100-MU-M THICK

被引：61

作者：

JUDELEWICZ, M

KUNZI, HU

MERK, N

ILSCHNER, B

机构：

[1] Mechanical Metallurgy Laboratory, Materials Department, Swiss Federal Institute of Technology

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1994年 / 186卷 / 1-2期

关键词：

D O I：

10.1016/0921-5093(94)90312-3

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Fatigue tests were conducted on metallic copper thin sheets of 100 mu m and 20 mu m in the traction-traction mode. Adequate specimens, suitable grips and a high frequency fatigue apparatus were designed and constructed. The development of dislocation structure during fatigue tests was shown by transmission electron microscopy. Upon cycling we observed the formation of an equiaxed cellular microstructure which gradually, owing to the stress concentration, transforms to a duplex microstructure consisting of elongated grain regions and cellular regions. Finally the elongated regions transform into persistent slip bands. Crack initiation occurs at stress concentration sites at the specimen surfaces but do not appear to be the essential cause of fatigue failure. For samples with grain sizes comparable with the sample thickness, thinner specimens show higher cycle numbers at the same stress amplitude.

引用

页码：135 / 142

页数：8

共 23 条

[1]

Allen DM., 1986, PRINCIPLES PRACTICE

[2]

DOBES F, 1991, ACTA TECH CSAV, V36, P339

[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 ARRANGEMENTS IN ALUMINUM DEFORMED BY REPEATED TENSILE STRESSES [J].

FELTNER, CE .

ACTA METALLURGICA, 1963, 11 (07) :817-&

[5] CRACK INITIATION MECHANISMS IN COPPER POLYCRYSTALS CYCLED UNDER CONSTANT STRAIN AMPLITUDES AND IN STEP TESTS [J].

FIGUEROA, JC ;

LAIRD, C .

MATERIALS SCIENCE AND ENGINEERING, 1983, 60 (01) :45-58

[6]

HANNULA SP, 1984, ASTM SPEC TECH PUBL, P850

[7]

HAUSMANN K, 1984, THESIS ERLANGEN

[8]

HAUSMANN K, 1986, DVS BERICHTE, V102, P69

[9] FATIGUE OF VERY THIN COPPER AND GOLD WIRES [J].

HOFBECK, R ;

HAUSMANN, K ;

ILSCHNER, B ;

KUNZI, HU .

SCRIPTA METALLURGICA, 1986, 20 (11) :1601-1605

[10]

JUELEWICZ M, 1993, THESIS ECOLE POLYTEC

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