Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1575189 | Materials Science and Engineering: A | 2014 | 8 Pages |
Abstract
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 T1 precipitate morphologies are obtained. Atomic resolution electron microscopy observations show that T1 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Thomas Dorin, Frédéric De Geuser, Williams Lefebvre, Christophe Sigli, Alexis Deschamps,