Strengthening mechanisms of T-1 precipitates and their influence on the plasticity of an Al-Cu-Li alloy. - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Materials Science and Engineering: A Année : 2014

Strengthening mechanisms of T-1 precipitates and their influence on the plasticity of an Al-Cu-Li alloy.

Résumé

This paper presents a systematic study of the influence of the state of precipitation on the plasticity of an Al-Cu-Li alloy. By varying the heat treatment, a variety of T-1 precipitate morphologies are obtained. Atomic resolution electron microscopy observations show that T-1 precipitates remain shearable even during early stages of over-ageing when their thickness is of several nanometres. They appear to be sheared only by single dislocations at a given location, which prevents catastrophic strain localisation at a microscopic scale. In later stages of over-ageing, the study of macroscopic strain hardening rate and of slip line localisation strongly suggests a transition to precipitate by-passing. The influence of the strengthening mechanism on strain reversal experiments (Bauschinger effect) is discussed. (C) 2014 Elsevier B.V. All rights reserved.

Domaines

Matériaux
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Dates et versions

hal-01073083 , version 1 (08-10-2014)

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Citer

T. Dorin, F. de Geuser, Williams Lefebvre, C. Sigli, A. Deschamps. Strengthening mechanisms of T-1 precipitates and their influence on the plasticity of an Al-Cu-Li alloy.. Materials Science and Engineering: A, 2014, 605, pp.119-126. ⟨10.1016/j.msea.2014.03.024⟩. ⟨hal-01073083⟩
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