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MICROSTRUCTURAL INFLUENCE ON THE INTRINSIC FATIGUE PROPERTIES OF AL-LI-8090 ALLOY

Title
MICROSTRUCTURAL INFLUENCE ON THE INTRINSIC FATIGUE PROPERTIES OF AL-LI-8090 ALLOY
Authors
PARK, KJPARK, CGKIM, NJLEE, CS
POSTECH Authors
PARK, CGKIM, NJLEE, CS
Date Issued
Jan-1995
Publisher
ELSEVIER SCIENCE SA LAUSANNE
Abstract
A study has been made to investigate the influence of microstructure on the extrinsic and intrinsic fatigue properties of the Al-Li alloy, 8090. Two types of microstructure have been produced to compare the relative fatigue properties, one with a delta' phase dominant microstructure and the other with a S' + delta' microstructure. Crack closure loads measured by the crack-opening displacement method have been used to obtain intrinsic fatigue resistance of the delta' and S' + delta' microstructures. Results have shown that the extrinsic fatigue resistance of the delta' microstructure was considerably higher than that of the S' + delta' microstructure, especially at lower growth rate, which was mainly due to the more severe crack path tortuosity and associated high levels of crack closure. In addition, the intrinsic fatigue resistance of the delta' microstructure was also observed to be higher than that of the S' + delta' microstructure, presumably due to greater slip reversibility in the delta' microstructure.
Keywords
FATIGUE; ALUMINUM; LITHIUM; ALLOYS; ALUMINUM-LITHIUM ALLOYS; CRACK-PROPAGATION; CU ALLOY; MN-CD; BEHAVIOR; TOUGHNESS; GROWTH; DUCTILITY; CLOSURE
URI
http://oasis.postech.ac.kr/handle/2014.oak/29319
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 190, no. 1-2, page. 99 - 108, 1995-01
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 LEE, CHONG SOO
Graduate Institute of Ferrous Technology
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