Quantitative description of the T1 morphology and strengthening mechanisms in an age-hardenable Al-Li-Cu alloy

Thomas Dorin, Alexis Deschamps, Frederic De Geuser, Matthew Weyland

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review


In the Al-Cu-Li system, the main strengthening precipitate is the T1 phase (Al2CuLi). In order to understand the strengthening related to the formation of this phase, we first present an investigation of the morphology of the T1 phase in an AA2198 alloy using Transmission Electron Microscopy (TEM) and Differential Scanning Calorimetry (DSC) in relation with the evolution of micro-hardness. In parallel, we present an investigation of the interaction between T1 precipitates and dislocations using High Angle Annular Dark Field (HAADF) imaging in an atomic resolution Scanning Transmission Electron Microscope (STEM). The atomic scale imaging of precipitates makes it possible to quantify the density of shearing events, which turns out to be insufficient to account for the imposed plastic strain. We discuss the implications of this result in terms of precipitate-dislocation interactions.
Original languageEnglish
Title of host publicationICAA13: Proceedings of 13th International Conference on Aluminum Alloys
EditorsHasso Weiland, Anthony D. Rollett, William A. Cassada
Place of PublicationHoboken, New Jersey
PublisherJohn Wiley & Sons
Number of pages6
ISBN (Electronic)9781118495292
ISBN (Print)9781118458044
Publication statusPublished - 4 Sep 2012
EventInternational Conference on Aluminium Alloys (ICAA) 2012 - Carnegie Mellon University, Pittsburgh, United States of America
Duration: 3 Jun 20127 Jun 2012
Conference number: 13th


ConferenceInternational Conference on Aluminium Alloys (ICAA) 2012
Abbreviated titleICCA13
CountryUnited States of America
Internet address


  • Al-Li-Cu
  • T1
  • microstructure
  • precipitation
  • strengthening

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