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

[11] FATIGUE INITIATION STUDY OF TMT EUTECTOID STEEL [J].

KAO, PW ;

BYRNE, JG .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1982, 13 (05) :855-864

[12] THE INFLUENCE OF LOADING METHODS ON FATIGUE CRACK INITIATION IN POLYCRYSTALLINE COPPER AT AMBIENT-TEMPERATURE [J].

KIM, GH ;

KWON, IB ;

FINE, ME .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1991, 142 (02) :177-182

[13] ROLE OF CYCLIC HARDENING IN CRACK NUCLEATION AT HIGH STRAIN AMPLITUDE [J].

KIM, WH ;

LAIRD, C .

MATERIALS SCIENCE AND ENGINEERING, 1978, 33 (02) :225-231

[14] CONTROL OF INTERGRANULAR FATIGUE CRACKING BY SLIP HOMOGENEITY IN COPPER .1. EFFECT OF GRAIN-SIZE [J].

LIANG, FL ;

LAIRD, C .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1989, 117 :95-102

[15] CYCLIC CREEP ACCELERATION AND RETARDATION IN POLYCRYSTALLINE COPPER TESTED AT AMBIENT-TEMPERATURE [J].

LORENZO, F ;

LAIRD, C .

ACTA METALLURGICA, 1984, 32 (05) :681-692

[16]

LORENZO F, 1984, ACTA METALL, V32, P617

[17] IS THERE A PLATEAU IN THE CYCLIC STRESS-STRAIN CURVES OF POLYCRYSTALLINE COPPER [J].

LUKAS, P ;

KUNZ, L .

MATERIALS SCIENCE AND ENGINEERING, 1985, 74 (01) :L1-L5

[18]

LYSENKO AG, 1977, IND LAB+, V43, P1612

[19] DISLOCATION WALL AND CELL STRUCTURES AND LONG-RANGE INTERNAL-STRESSES IN DEFORMED METAL CRYSTALS [J].

MUGHRABI, H .

ACTA METALLURGICA, 1983, 31 (09) :1367-1379

[20]

MUGHRABI H, 1982, 1ST P INT S DEF FRAC, P15

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