期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.03.024
关键词
Aluminium; Precipitation; Plasticity; Strengthening; Shearing
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.
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