The influence of precipitation on plastic deformation of Al-Cu-Li alloys

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

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The plastic behaviour of two recently developed Al–Cu–Li alloys with different Cu/Li ratios, AA2198 and AA2196, was studied as a function of precipitation state by tensile tests, strain hardening rate analysis, Bauschinger tests, slip line imaging and atomic scale characterization of precipitate shearing by advanced electron microscopy. For early ageing times where δ′ and/or solute clusters are present, plasticity occurs heterogeneously, the strain hardening rate is high, and the Bauschinger effect is moderate. When T1 precipitates are present, plasticity becomes more homogeneous, and the strain hardening rate shows a slower decrease compared with other aluminium alloys containing shearable precipitates. In addition, these ageing conditions show a high reversibility of plastic strain, and it is observed that precipitates are sheared only by single steps. The possibility of a specific shearing mechanism of the T1 phase is discussed in light of these results.
Original languageEnglish
Pages (from-to)4010 - 4021
Number of pages12
JournalActa Materialia
Volume61
Issue number11
DOIs
Publication statusPublished - 2013

Cite this

Deschamps, Alexis ; Decreus, Benjamin ; De Geuser, Frederic ; Dorin, Thomas ; Weyland, Matthew. / The influence of precipitation on plastic deformation of Al-Cu-Li alloys. In: Acta Materialia. 2013 ; Vol. 61, No. 11. pp. 4010 - 4021.
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author = "Alexis Deschamps and Benjamin Decreus and {De Geuser}, Frederic and Thomas Dorin and Matthew Weyland",
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The influence of precipitation on plastic deformation of Al-Cu-Li alloys. / Deschamps, Alexis; Decreus, Benjamin; De Geuser, Frederic; Dorin, Thomas; Weyland, Matthew.

In: Acta Materialia, Vol. 61, No. 11, 2013, p. 4010 - 4021.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

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AU - Deschamps, Alexis

AU - Decreus, Benjamin

AU - De Geuser, Frederic

AU - Dorin, Thomas

AU - Weyland, Matthew

PY - 2013

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AB - The plastic behaviour of two recently developed Al–Cu–Li alloys with different Cu/Li ratios, AA2198 and AA2196, was studied as a function of precipitation state by tensile tests, strain hardening rate analysis, Bauschinger tests, slip line imaging and atomic scale characterization of precipitate shearing by advanced electron microscopy. For early ageing times where δ′ and/or solute clusters are present, plasticity occurs heterogeneously, the strain hardening rate is high, and the Bauschinger effect is moderate. When T1 precipitates are present, plasticity becomes more homogeneous, and the strain hardening rate shows a slower decrease compared with other aluminium alloys containing shearable precipitates. In addition, these ageing conditions show a high reversibility of plastic strain, and it is observed that precipitates are sheared only by single steps. The possibility of a specific shearing mechanism of the T1 phase is discussed in light of these results.

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