Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 485, Issue 1-2, Pages 613-620Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.10.020
Keywords
Al-Li; Al-Li-Cu; Al-Li-Cu-Mg; delta'; strength; toughness
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Al-1.7%Li, Al-1.7%Li-Cu, and Al-1.7%Li-Cu-Mg alloys have been given a damage-tolerant age of 24 h at 150 degrees C and then exposed for 1000 h at 70 degrees C. As a result of exposure, all alloys underwent an increase in strength and a decrease in toughness largely as a result of continued precipitation of delta'. The magnitude of this change in mechanical properties increased in the sequence Al-Li < Al-Li-Cu < AI-Li-Cu-Mg. The reasons for the different behaviour during exposure of the various alloys have been sought by TEM, DSC and electrical resistivity measurements. From these results it is proposed that the mechanisms of delta' formation during exposure are widely different in the three alloy systems. (C) 2007 Elsevier B.V. All rights reserved.
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