FATIGUE-CRACK PROPAGATION MECHANISMS IN AN ALUMINUM-LITHIUM ALLOY

被引：17

作者：

RANGANATHAN, N ^{[1
]}

ADIWIJAYANTO, F ^{[1
]}

PETIT, J ^{[1
]}

BAILON, JP ^{[1
]}

机构：

[1] ECOLE POLYTECH, DEPT MET, MONTREAL, PQ H3C 3A7, CANADA

来源：

ACTA METALLURGICA ET MATERIALIA | 1995年 / 43卷 / 03期

关键词：

D O I：

10.1016/0956-7151(94)00301-W

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Different fatigue micromechanisms have been identified by fractographic observations in an aluminium-lithium alloy tested in vacuum and in air under constant and variable amplitude loading conditions. In vacuum, large crystallographic facets are observed for all the studied test conditions. In air, for constant amplitude test conditions, the different cracking mechanisms observed are (apart from facetted crack growth) quasi intergranular cracking and cracking by formation of Herringbone patterns. Under certain variable amplidude loading conditions crystallographic facets are not observed and evidence of striation formation is found. The morphology of these striations is different from that of classical ductile striations. This change in cracking mechanism is attributed to multiple slip activity and slip homogenization operating only in air for particular loading conditions.

引用

页码：1029 / 1035

页数：7

共 21 条

[1] MICROSTRUCTURE AND FATIGUE CRACK GROWTH IN A GAMMA-FE-NI-AL ALLOY [J].

HORNBOGEN, E ;

GAHR, KHZ .

ACTA METALLURGICA, 1976, 24 (06) :581-592

[2] THE EFFECTS OF FREQUENCY AND R-RATIO ON FATIGUE CRACK-GROWTH BEHAVIOR IN AL-LI-CU-MG ALLOY (8090) PLATE [J].

KEMP, RMJ ;

WILSON, RN ;

GREGSON, PJ .

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, 1992, 15 (03) :291-308

[3]

LESPINASSE C, 1987, J PHYSIQUE S, V9, P793

[4] HERRINGBONE PATTERNS ON FRACTURE SURFACES [J].

LYNCH, SP .

SCRIPTA METALLURGICA, 1986, 20 (07) :1067-1072

[5] THE MICROMECHANISMS OF FATIGUE CRACK-GROWTH IN A COMMERCIAL AL-ZN-MG-CU ALLOY [J].

NIX, KJ ;

FLOWER, HM .

ACTA METALLURGICA, 1982, 30 (08) :1549-1559

[6]

OHRLOFF N, 1987, J PHYSIQUE S, V9, P801

[7]

PELLOUX RMN, 1969, T ASM, V62, P281

[8] ON MICROMECHANISMS OF FATIGUE-CRACK GROWTH IN THE 8090-T651 ALUMINUM-LITHIUM ALLOY [J].

RANGANATHAN, N ;

LI, SQ ;

BAILON, JP ;

PETIT, J .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1994, 187 (01) :37-42

[9]

Ranganathan N., 1987, ASTM INT, P424

[10]

RANGANATHAN N, 1990, ADV ALUMINIUM MAGNES, P165

← 1 2 3 →