Acoustic emission characteristics associated with macrostructures and plate orientations of an Al-Li 8090 alloy
SCIE
SCOPUS
- Title
- Acoustic emission characteristics associated with macrostructures and plate orientations of an Al-Li 8090 alloy
- Authors
- Lee, KA; Lee, CS
- Date Issued
- 1997-06-30
- Publisher
- ELSEVIER SCIENCE SA LAUSANNE
- Abstract
- An investigation was carried out to study the microstructural influence on the acoustic emission (AE) behavior during the tensile and fracture tests of an Al-Li 8090 alloy, and to correlate it with the deformation mechanisms of two different microstructures (the delta' microstructure and the S' + delta' microstructure), and of two different orientations (L and S). For the L-oriented specimens, continuous emissions were mostly produced in the delta' microstructure due to the shearing of coherent delta' precipitates, while in the S'+delta' microstructure the burst type emissions were dominant mainly due to the shearing or microcracking of large incoherent S' precipitates as well as the intergranular failure. The S-oriented specimens of both microstructures showed more burst emissions than the L-oriented ones, which resulted from the frequent occurrence of intergranular delamination in the L-oriented specimens. The K-AE values measured by AE method were well agreed with the K-IC values, implying that the K-AE could be considered as a quantitative and reliable parameter to evaluate the fracture toughness of a material. (C) 1997 Elsevier Science S.A.
- Keywords
- acoustic emission; microstructures; plate orientations; ALUMINUM-LITHIUM ALLOYS; MG-ZR ALLOY; DEFORMATION; TOUGHNESS; BEHAVIOR
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21261
- DOI
- 10.1016/S0921-5093(97)00006-3
- ISSN
- 0921-5093
- Article Type
- Article
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 229, no. 1-2, page. 219 - 227, 1997-06-30
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