期刊
ACTA MATERIALIA
卷 62, 期 -, 页码 129-140出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.09.041
关键词
Yield stress; Precipitation; Age-hardening aluminium alloys; Small-angle neutron scattering; Heat-affected zone
资金
- Areva
- French Atomic Energy Commission (CEA)
- INSA Lyon
- AREVA-SAFRAN chair
In age-hardening alloys, high-temperature processes, such as welding, can strongly modify the precipitation state, and thus degrade the associated mechanical properties. The aim of this paper is to present a coupled approach able to describe precipitation and associated yield stresses for non-isothermal treatments of a 6061 aluminium alloy. The precipitation state (in terms of volume fraction and precipitate size distribution) is modelled thanks to a recent implementation of the classical nucleation and growth theories for needle-shaped precipitates. The precipitation model is validated through small-angle neutron scattering and transmission electron microscopy experiments. The precipitation size distribution is then used as an entry parameter of a micromechanical model for the yield strength of the alloy. Predicted yield stresses are compared to tensile tests performed with various heating conditions, representative of the heat-affected zone of a welded joint. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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